Note 3 - Investment Securities - Portfolio of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized cost	$ 721,799	$ 535,182
Gross unrealized gains	289	4,281
Gross unrealized losses	(87,204)	(4,956)
Securities available-for-sale	634,884	534,507
US Government Agencies Debt Securities [Member]
Amortized cost	54,889	50,336
Gross unrealized gains	0	649
Gross unrealized losses	(10,439)	(625)
Securities available-for-sale	44,450	50,360
Residential Mortgage-Backed Securities [Member]
Amortized cost	475,263	317,111
Gross unrealized gains	178	1,868
Gross unrealized losses	(57,863)	(2,884)
Securities available-for-sale	417,578	316,095
Commercial Mortgage-Backed Securities [Member]
Amortized cost	25,485	10,814
Gross unrealized gains	0	118
Gross unrealized losses	(4,381)	(463)
Securities available-for-sale	21,104	10,469
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	157,247	145,045
Gross unrealized gains	111	1,562
Gross unrealized losses	(14,462)	(982)
Securities available-for-sale	142,896	145,625
Corporate Debt Securities [Member]
Amortized cost	7,000	8,968
Gross unrealized gains	0	81
Gross unrealized losses	(26)	0
Securities available-for-sale	6,974	9,049
Asset-Backed Securities [Member]
Amortized cost	1,673	2,563
Gross unrealized gains	0	3
Gross unrealized losses	(33)	(2)
Securities available-for-sale	1,640	2,564
Other Debt Obligations [Member]
Amortized cost	242	195
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Securities available-for-sale	$ 242	195
Certificates of Deposit [Member]
Amortized cost		150
Gross unrealized gains		0
Gross unrealized losses		0
Securities available-for-sale		$ 150

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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