Mortgage Broker vs Bank vs Credit Union for a Conventional Loan

The Quick Read: No one of the three wins for every buyer. A bank or credit union lends its own money and sells you one shelf of products. A broker shops your file across several wholesale lenders. A credit union adds a membership gate, and often a relationship. The conventional loan itself is the same product in all three channels. What changes is who you deal with, which extra rules apply, and how your file gets matched.

Side-by-Side

Here is the comparison on the points that decide most files. Pricing is left off on purpose. It differs by lender and by day, and the Loan Estimate is where you compare it.

Mortgage insurance is the same story in every column. Leverage above 80% loan-to-value (LTV, the loan as a share of the home’s value) means mortgage insurance. It can be cancelled at 80% of the original value if you ask and the history is clean. The servicer must end it automatically at 78% under the Homeowners Protection Act.

What Actually Stays the Same

Start here, because it clears up the biggest myth. Banks, credit unions and brokers do not offer different kinds of conventional loans.

Fannie Mae’s Selling Guide treats a broker as a third-party originator. It also says the lender selling the loan stays responsible for it, even when others handled parts of the process.

So the base envelope holds in every channel. On a principal residence, the agencies allow 97% LTV (3% down) when at least one borrower is a first-time buyer with a fixed rate. Otherwise the limit is 95% LTV (5% down). Two- to four-unit principal residences go to 95%. Second homes go to 90%. Investment property is capped at 85% on one unit and 75% on two to four units. Those are agency limits, and each lender can add its own overlays. Overlays are extra rules a lender layers on top of the agency’s. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.

Across the wholesale conventional programs Lendmire places files with, the credit floor starts at a 620 decision score. The automated underwriting finding governs most files, with a total debt-to-income ceiling of 50%. A manually underwritten loan uses tighter ratios, 36% or 45%, depending on the reserves and score. All of this is subject to lender guidelines and full file review.

Use this when comparing channels: the guide is shared, but the overlays are not. One lender may stop at a higher score than the agency does. Another may follow the agency line. That is the real gap between channels, and it is why the same file can get a different answer in different places.

How Each Option Works

The bank

A bank is a direct lender. One institution takes your application, underwrites it, and in the usual case funds it. The loan officer is the bank’s employee.

That setup is simple. There is one point of contact and one set of overlays. If you already hold deposits there, the relationship may matter to how the bank treats your file. The limit is the shelf. You get that bank’s conventional program, and nobody else’s.

The credit union

A credit union is also a direct lender. It is member-owned, and its field of membership decides who can join. That can be based on an employer, an association, a local community or an underserved area.

Joining usually means a signed application and a small share deposit, per an NCUA legal opinion. So there is a gate before any mortgage conversation. If you already belong, that gate is open. If you do not, check eligibility first.

The mortgage broker

A broker does not lend money. The CFPB says you can use one to find different lenders or loan types. Federal rules define a mortgage broker as a loan originator who is not an employee of the creditor, per 12 CFR 1026.36.

In practice, the brokerage gathers your file and places it with a wholesale lender. That lender underwrites, funds and closes the loan. Lendmire works this way: it is a mortgage broker arranging conventional loan programs through wholesale lenders, and it does not lend. Wholesale lenders sit at different points on credit, ratios and overlays. Placement is the broker’s whole job.

A broker also has real limits. It typically cannot grant exceptions to the wholesale lender’s guidelines. It usually has no branch. And it has no relationship with your existing accounts.

When a Mortgage Broker Is the Better Fit

A broker tends to fit when your file does not look like a textbook. Think of a borrower with a score near the floor, a ratio near the ceiling, or a recent credit event. The agencies set waiting periods after those events: four years from a chapter 7 discharge, seven from a foreclosure, and four from a short sale or deed in lieu. Shorter periods may apply with documented extenuating circumstances. Lender overlays around those rules differ, and a broker can try a file against more than one set.

It also fits when you want one conversation instead of three. Picture a first-time buyer with a modest down payment who is aiming at the 97% LTV program. Not every lender runs that program the same way. A broker can see which wholesale lender’s guidelines match. Exact terms depend on the lender’s guidelines, property type, leverage, and a full review of the borrower’s file.

Brokers also fit buyers who do not have a deposit relationship to protect. And they suit buyers who are comfortable doing everything by phone and email.

The honest caveat: a broker is not automatically cheaper. The CFPB advises shopping around whichever channel you use. Brokers are paid by the lender or by you, and a fee you pay directly is not banned as a loan term. Rules bar a broker from being paid based on the loan’s rate or APR, and when you pay the broker directly, the lender cannot also pay that broker on the same loan. Either way, the compensation shows up on your Loan Estimate. Read it.

When a Bank or Credit Union Is the Better Fit

A bank fits when your file is clean and your relationship is real. If your paycheck lands there, your savings sit there, and the loan officer is down the street, you get convenience that a brokerage can’t copy. Some banks reward that relationship in how they handle your file. Ask what they offer in writing.

A credit union fits when you are already a member, or can easily become one. Many members like dealing with a lender they already trust. Ask each credit union how it handles the file and whether it keeps or sells the loan. That answer decides who you pay each month afterward.

Both fit buyers who want to see the underwriter’s name and the branch address. They also fit buyers whose file is plainly in the middle of the agency box. If your score, ratio and down payment all sit comfortably inside the guide, there is less for a second lender to improve on.

Their limits are the mirror of the broker’s strengths. You get one lender’s overlays. If they decline, you start over somewhere else.

A third hybrid path often gets overlooked. Nothing stops you from asking all three. The CFPB says to request Loan Estimates for the same kind of loan from different lenders, because costs vary by lender and by loan type.

How to Compare All Three Fairly

Shopping works. Rates are not quoted here, and any quote you receive will differ based on your own scenario. The point is that a second and third quote pay off.

Here is the method:

1. Ask for the same loan. Same term, same down payment, same occupancy. Otherwise the comparison is noise.

2. Get Loan Estimates. Lenders must send one once they have six items: name, income, Social Security number, property address, estimated value and loan amount, per the CFPB. A lender cannot charge you anything beyond a credit report first.

3. Compare line by line. The same standardized form comes from banks, credit unions and brokers. The form splits services you can shop for from those you cannot.

4. Ask three questions. Who funds the loan? Who services it afterward? How is the loan officer paid?

5. Mind the credit pulls. Multiple mortgage credit checks within a 45-day window are recorded as a single inquiry, per the CFPB. Shopping does not stack damage.

Which Channel for Which Borrower

The pattern is simple. The more standard the file, the less a broker adds. The less standard the file, the more it can.

Common Myths

• “A broker is the lender.” No. A broker does not lend; a wholesale lender funds the loan.
• “Brokers are free.” You pay a broker’s compensation one way or another, and the Loan Estimate shows it.
• “Credit unions are always cheaper.” Not guaranteed. Compare the form.
• “Anyone can join any credit union.” Membership depends on the field of membership.
• “Shopping hurts my credit.” Not within the 45-day window.

A fair note: some brokerages advertise shopping many lenders while sending most loans to one. Ask how many wholesale lenders a broker actually uses.

A Balanced Verdict

Pick the broker when your file needs matching, the bank when your relationship is worth something, and the credit union when you already belong. Pick all three when you can, because the quotes are cheap to get and the differences are real.

Since the conventional product is the same everywhere, you are choosing service, overlays and fit rather than a different loan. If you are buying a home and want to see whether a conventional loan fits your file, Lendmire can help you compare the options and what each one asks of the file.

For your own numbers, request a scenario review with Lendmire.

About Lendmire

Lendmire, NMLS# 2371349, is a mortgage brokerage with consumer lending licenses in 16 states. FHA, VA, conventional and jumbo purchase and refinance loans are arranged through wholesale lending partners, and each application is reviewed individually by the lender. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. Fannie Mae – Selling Guide A3-3-01

2. NCUA – Field-of-Membership Expansion

3. NCUA legal opinion – Simultaneous loan and membership application

4. CFPB – Difference between a mortgage lender and a mortgage broker

5. eCFR – 12 CFR 1026.36

6. CFPB – Loan Estimate explainer

7. CFPB – Request and review multiple Loan Estimates