Note 9 - Derivatives and Hedging Activities (Details Textual) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Noninterest Income	$ 9,246,000	$ 7,280,000	$ 23,842,000	$ 24,319,000
Interest Rate Swap [Member]
Noninterest Income			100,000		$ 100,000
Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral	35,200,000		35,200,000		25,900,000
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset	34,700,000		34,700,000		25,300,000
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset	36,100,000		36,100,000		25,200,000
Derivative Asset, Subject to Master Netting Arrangement, before Offset	1,400,000		1,400,000		100,000
Derivative Liability, Subject to Master Netting Arrangement, after Offset	300,000		300,000		400,000
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset	300,000		300,000		400,000
Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction	100,000		100,000		0
Derivative, Notional Amount	$ 592,000,000		$ 592,000,000		$ 402,000,000