Note 4 - Loans and the Allowance for Credit Losses - Loans Receivable on Nonaccrual Status (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Nonaccrual loans with ACL	$ 10,809	$ 34,336
Nonaccrual loans without ACL	41,715	10,118
Total Nonaccrual loans	52,524	44,454
Commercial Portfolio Segment [Member]
Nonaccrual loans with ACL	1,763	23,512
Nonaccrual loans without ACL	11,064	1,745
Total Nonaccrual loans	12,827	25,257
Commercial Real Estate Portfolio Segment [Member]
Nonaccrual loans with ACL	8,013	10,220
Nonaccrual loans without ACL	28,179	6,597
Total Nonaccrual loans	36,192	16,817
Residential Portfolio Segment [Member]
Nonaccrual loans with ACL	1,033	604
Nonaccrual loans without ACL	2,472	1,776
Total Nonaccrual loans	$ 3,505	$ 2,380