Note 4 - Investment Securities - Amortized Cost and Fair Value of Investment Securities Classified as AFS (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Amortized Cost	$ 477,242	$ 356,639
Gross Unrealized Gains	397	1,935
Gross Unrealized Losses	(64,453)	(3,065)
Investment securities	413,186	355,509
US Government Corporations and Agencies Securities [Member]
Amortized Cost	31,438	21,143
Gross Unrealized Gains	163	152
Gross Unrealized Losses	(724)	(27)
Investment securities	30,877	21,268
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	20,967	32,330
Gross Unrealized Gains	0	468
Gross Unrealized Losses	(3,017)	(213)
Investment securities	17,950	32,585
Corporate Debt Securities [Member]
Amortized Cost	33,467	27,777
Gross Unrealized Gains	0	235
Gross Unrealized Losses	(3,363)	(345)
Investment securities	30,104	27,667
Residential Mortgage-Backed Securities [Member]
Amortized Cost	304,410	200,696
Gross Unrealized Gains	8	711
Gross Unrealized Losses	(49,211)	(1,503)
Investment securities	255,207	199,904
Commercial Mortgage-Backed Securities [Member]
Amortized Cost	86,960	74,693
Gross Unrealized Gains	226	369
Gross Unrealized Losses	(8,138)	(977)
Investment securities	$ 79,048	$ 74,085

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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Amount, before tax, of unrealized loss 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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