Note 5 - Loans and the Allowance for Credit Losses - Loans Receivable on Nonaccrual Status (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Nonaccrual loans with ACL	$ 2,439	$ 10,809
Nonaccrual loans without ACL	44,999	41,715
Total Nonaccrual loans	47,438	52,524
Commercial Portfolio Segment [Member]
Nonaccrual loans with ACL	1,683	1,763
Nonaccrual loans without ACL	10,957	11,064
Total Nonaccrual loans	12,640	12,827
Commercial Real Estate Portfolio Segment [Member]
Nonaccrual loans with ACL	65	8,013
Nonaccrual loans without ACL	33,210	28,179
Total Nonaccrual loans	33,275	36,192
Residential Mortgage [Member]
Nonaccrual loans with ACL	691
Nonaccrual loans without ACL	832
Total Nonaccrual loans	1,523
Residential Portfolio Segment [Member]
Nonaccrual loans with ACL		1,033
Nonaccrual loans without ACL		2,472
Total Nonaccrual loans	$ 1,523	$ 3,505