Note 12 - Commitments, Contingencies and Concentrations of Credit Risk - Summary of Off-balance Sheet Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Off-balance sheet risk	$ 1,166,979	$ 1,171,526
Commitments to Extend Credit [Member]
Off-balance sheet risk	723,228	662,515
Home Equity Line of Credit [Member]
Off-balance sheet risk	48,786	54,302
Outstanding Commercial Mortgage Loan Commitments [Member]
Off-balance sheet risk	370,574	433,034
Standby Letters of Credit [Member]
Off-balance sheet risk	23,562	20,770
Overdraft Protection Lines [Member]
Off-balance sheet risk	$ 829	$ 905