Note 4 - Investment Securities - Portfolio of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Amortized cost	$ 708,437	$ 698,362
Gross unrealized gains	484	1,224
Gross unrealized losses	(96,074)	(82,424)
Securities available-for-sale	612,847	617,162
US Government Agencies Debt Securities [Member]
Amortized cost	96,165	55,898
Gross unrealized gains	179	189
Gross unrealized losses	(11,674)	(10,761)
Securities available-for-sale	84,670	45,326
Residential Mortgage-Backed Securities [Member]
Amortized cost	439,445	462,004
Gross unrealized gains	211	620
Gross unrealized losses	(60,818)	(51,433)
Securities available-for-sale	378,838	411,191
Commercial Mortgage-Backed Securities [Member]
Amortized cost	24,989	25,240
Gross unrealized gains	0	0
Gross unrealized losses	(4,097)	(3,676)
Securities available-for-sale	20,892	21,564
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	141,775	148,795
Gross unrealized gains	89	415
Gross unrealized losses	(19,460)	(16,505)
Securities available-for-sale	122,404	132,705
Corporate Debt Securities [Member]
Amortized cost	5,000	5,000
Gross unrealized gains	5	0
Gross unrealized losses	(18)	(27)
Securities available-for-sale	4,987	4,973
Asset-Backed Securities [Member]
Amortized cost	892	1,260
Gross unrealized gains	0	0
Gross unrealized losses	(7)	(22)
Securities available-for-sale	885	1,238
Other Debt Obligations [Member]
Amortized cost	171	165
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Securities available-for-sale	$ 171	$ 165

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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