Note 12 - Commitments, Contingencies and Concentrations of Credit Risk - Summary of Off-balance Sheet Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Off-balance sheet risk	$ 1,171,526	$ 1,241,868
Commitments to Extend Credit [Member]
Off-balance sheet risk	662,515	647,971
Home Equity Line of Credit [Member]
Off-balance sheet risk	54,302	53,180
Outstanding Commercial Mortgage Loan Commitments [Member]
Off-balance sheet risk	433,034	514,473
Standby Letters of Credit [Member]
Off-balance sheet risk	20,770	25,271
Overdraft Protection Lines [Member]
Off-balance sheet risk	$ 905	$ 973