As a listing agent, one of the things I look at in an offer is that the selling agent has a good working relationship with the lender. This is because, to the loan rep, the agent represents a bunch of transactions, not just this one. When an offer comes in and the agent doesn't know the lender, I feel the agent doesn't have any "pull" to get through any hurdles. I also question the reliability of the pre-qualification letter and any promises made to the buyer about getting the loan.
All the best,
Good luck and best,
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And as Marie suggests, ask your Realtor for some suggestions. Your agent wants the deal to close, so he/she will refer you to some with whom there's a good relationship. Someone dependable. Note: Your agent won't be getting a commission or "kickback" from the lender. Increasing the likelihood of the deal closing is motivation enough. And certainly feel free to shop around with local lenders. But keep it local, and keep it among the larger, better known companies. And if the numbers are all about the same (which, frankly, they probably will be), seriously consider going with the lender your Realtor recommends.
Hope that helps.
best of luck!