Note 3 - Investment Securities - Portfolio of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Amortized cost	$ 716,566	$ 698,362
Gross unrealized gains	426	1,224
Gross unrealized losses	(96,413)	(82,424)
Securities available-for-sale	620,579	617,162
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
US Government Agencies Debt Securities [Member]
Amortized cost	93,088	55,898
Gross unrealized gains	205	189
Gross unrealized losses	(11,918)	(10,761)
Securities available-for-sale	81,375	45,326
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Residential Mortgage-Backed Securities [Member]
Amortized cost	446,631	462,004
Gross unrealized gains	148	620
Gross unrealized losses	(60,787)	(51,433)
Securities available-for-sale	385,992	411,191
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Commercial Mortgage-Backed Securities [Member]
Amortized cost	25,115	25,240
Gross unrealized gains	0	0
Gross unrealized losses	(3,697)	(3,676)
Securities available-for-sale	21,418	21,564
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	145,574	148,795
Gross unrealized gains	73	415
Gross unrealized losses	(19,977)	(16,505)
Securities available-for-sale	125,670	132,705
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Corporate Debt Securities [Member]
Amortized cost	5,000	5,000
Gross unrealized gains	0	0
Gross unrealized losses	(22)	(27)
Securities available-for-sale	4,978	4,973
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Asset-Backed Securities [Member]
Amortized cost	1,012	1,260
Gross unrealized gains	0	0
Gross unrealized losses	(12)	(22)
Securities available-for-sale	1,000	1,238
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Other Debt Obligations [Member]
Amortized cost	146	165
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Securities available-for-sale	146	165
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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