Note 2 - Cash and Due From Banks (Details Textual) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Cash, Uninsured Amount	$ 3	$ 5
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	$ 219	$ 170

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

No definition available.

Name:	us-gaap_CashUninsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant