Note 2 - Cash and Due From Banks (Details Textual) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Cash, Uninsured Amount	$ 8	$ 92
Federal Home Loan Bank Stock and Federal Reserve Bank Stock, Total	$ 76	$ 811

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