Note 11 - Commitments and Contingent Liabilities - Total Contractual Amount for All Off-balance Sheet Commitments (Details)	Mar. 31, 2022 USD ($)
Standby Letters of Credit [Member]
Commitments	$ 110,245,000
Commitments to Extend Credit [Member]
Commitments	$ 1,331,196,000

The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

No definition available.

Name:	us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant