Note 4 - Investment Securities - Portfolio of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Amortized cost	$ 724,723	$ 708,437
Gross unrealized gains	1,162	484
Gross unrealized losses	(89,079)	(96,074)
Securities available-for-sale	636,806	612,847
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
US Government Agencies Debt Securities [Member]
Amortized cost	112,880	96,165
Gross unrealized gains	571	179
Gross unrealized losses	(10,690)	(11,674)
Securities available-for-sale	102,761	84,670
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Residential Mortgage-Backed Securities [Member]
Amortized cost	441,169	439,445
Gross unrealized gains	572	211
Gross unrealized losses	(53,392)	(60,818)
Securities available-for-sale	388,349	378,838
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Commercial Mortgage-Backed Securities [Member]
Amortized cost	24,925	24,989
Gross unrealized gains	0	0
Gross unrealized losses	(3,874)	(4,097)
Securities available-for-sale	21,051	20,892
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	139,759	141,775
Gross unrealized gains	14	89
Gross unrealized losses	(21,116)	(19,460)
Securities available-for-sale	118,657	122,404
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Corporate Debt Securities [Member]
Amortized cost	5,000	5,000
Gross unrealized gains	4	5
Gross unrealized losses	0	(18)
Securities available-for-sale	5,004	4,987
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Asset-Backed Securities [Member]
Amortized cost	865	892
Gross unrealized gains	1	0
Gross unrealized losses	(7)	(7)
Securities available-for-sale	859	885
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Other Debt Obligations [Member]
Amortized cost	125	171
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Securities available-for-sale	125	171
Debt Securities, Available-for-Sale, Allowance for Credit Loss	$ 0	$ 0

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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