Note 7 - Fair Value Measurements and Fair Value of Financial Instruments - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Securities available-for-sale	$ 636,806	$ 612,847
Fair Value, Recurring [Member]
Securities available-for-sale	636,806	612,847
Equity securities	18,859	20,092
Derivatives - interest rate contracts	28,914	37,398
Total assets	684,579	670,337
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	125	171
Equity securities	9,893	9,739
Derivatives - interest rate contracts	0	0
Total assets	10,018	9,910
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	630,044	606,150
Equity securities	8,966	10,353
Derivatives - interest rate contracts	28,914	37,398
Total assets	667,924	653,901
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	6,637	6,526
Equity securities	0	0
Derivatives - interest rate contracts	0	0
Total assets	6,637	6,526
US Government Agencies Debt Securities [Member]
Securities available-for-sale	102,761	84,670
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale	102,761	84,670
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	102,761	84,670
US Government Agencies Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Residential Mortgage-Backed Securities [Member]
Securities available-for-sale	388,349	378,838
Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale	388,349	378,838
Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	388,349	378,838
Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Commercial Mortgage-Backed Securities [Member]
Securities available-for-sale	21,051	20,892
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale	21,051	20,892
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	21,051	20,892
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale	118,657	122,404
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale	118,657	122,404
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	112,020	115,878
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	6,637	6,526
Corporate Debt Securities [Member]
Securities available-for-sale	5,004	4,987
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale	5,004	4,987
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	5,004	4,987
Corporate Debt Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Asset-Backed Securities [Member]
Securities available-for-sale	859	885
Asset-Backed Securities [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale	859	885
Asset-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
Asset-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	859	885
Asset-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Other Debt Obligations [Member]
Securities available-for-sale	125	171
Other Debt Obligations [Member] \| Fair Value, Recurring [Member]
Securities available-for-sale	125	171
Other Debt Obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	125	171
Other Debt Obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	0	0
Other Debt Obligations [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	$ 0	$ 0