Note 5 - Loans and the Allowance for Credit Losses - Loans Receivable on Nonaccrual Status (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Nonaccrual loans with ACL	$ 22,480	$ 34,336
Nonaccrual loans without ACL	33,579	10,118
Total Nonaccrual loans	56,059	44,454
Commercial Portfolio Segment [Member]
Nonaccrual loans with ACL	21,604	23,512
Nonaccrual loans without ACL	555	1,745
Total Nonaccrual loans	22,159	25,257
Commercial Real Estate Portfolio Segment [Member]
Nonaccrual loans with ACL	70	10,220
Nonaccrual loans without ACL	29,754	6,597
Total Nonaccrual loans	29,824	16,817
Residential Portfolio Segment [Member]
Nonaccrual loans with ACL	806	604
Nonaccrual loans without ACL	3,270	1,776
Total Nonaccrual loans	$ 4,076	$ 2,380