The FDIC is required by law to use the plan for handling a failed bank that will cost the least to its fund.
Buyouts offers that cover all insured funds are typically cheaper than directly paying out. Indeed, most commonly the buying bank will offer to take all the full balance of any insurable account, not just up to the insurance limit. The logic here seems to be that the extra from taking on those balances is usually pretty small, and it does save work on the FDIC's side as there would be fewer creditors. Thus it makes bids with that include full balances more attractive than those that don't, increasing the chance that the buyer's bid will be selected for final resolution.
Of course, occasionally the winning bid is limited to just insured balances, and very occasionally, the cheapest option is for the FDIC to directly cut checks to handle the insurance side, and proceed as receiver in selling off any saleable assets and paying of creditors.
Buyouts offers that cover all insured funds are typically cheaper than directly paying out. Indeed, most commonly the buying bank will offer to take all the full balance of any insurable account, not just up to the insurance limit. The logic here seems to be that the extra from taking on those balances is usually pretty small, and it does save work on the FDIC's side as there would be fewer creditors. Thus it makes bids with that include full balances more attractive than those that don't, increasing the chance that the buyer's bid will be selected for final resolution.
Of course, occasionally the winning bid is limited to just insured balances, and very occasionally, the cheapest option is for the FDIC to directly cut checks to handle the insurance side, and proceed as receiver in selling off any saleable assets and paying of creditors.