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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 01, 2022	Dec. 31, 2021
Amortized cost, available for sale securities	$ 206,615		$ 290,058
Gross unrealized gains, available for sale securities	133		2,033
Gross unrealized losses, available for sale securities	(30,345)		(2,596)
Debt Securities, Available-for-Sale, Total	176,403	$ 74,400	289,495
Amortized cost, held to maturity securities	154,894		33,441
Gross unrealized gains, held to maturity securities	0		242
Gross unrealized losses, held to maturity securities	(11,974)		(66)
Fair value, held to maturity securities	142,920		33,617
Amortized cost	361,509		323,499
Gross unrealized gains	133		2,275
Gross unrealized losses	(42,319)		(2,662)
Total securities, fair value	319,323		323,112
US Treasury Securities [Member]
Amortized cost, available for sale securities	19,953		39,871
Gross unrealized gains, available for sale securities	0		37
Gross unrealized losses, available for sale securities	(2,422)		(250)
Debt Securities, Available-for-Sale, Total	17,531		39,658
Amortized cost, held to maturity securities	37,994
Gross unrealized gains, held to maturity securities	0
Gross unrealized losses, held to maturity securities	(638)
Fair value, held to maturity securities	37,356
US Agency and Mortgage-backed Securities [Member]
Amortized cost, available for sale securities	122,190		177,131
Gross unrealized gains, available for sale securities	113		1,085
Gross unrealized losses, available for sale securities	(16,000)		(1,837)
Debt Securities, Available-for-Sale, Total	106,303		176,379
Amortized cost, held to maturity securities	101,321		26,392
Gross unrealized gains, held to maturity securities	0		124
Gross unrealized losses, held to maturity securities	(9,351)		(53)
Fair value, held to maturity securities	91,970		26,463
US States and Political Subdivisions Debt Securities [Member]
Amortized cost, available for sale securities	64,472		71,037
Gross unrealized gains, available for sale securities	20		910
Gross unrealized losses, available for sale securities	(11,923)		(509)
Debt Securities, Available-for-Sale, Total	52,569		71,438
Amortized cost, held to maturity securities	12,579		7,049
Gross unrealized gains, held to maturity securities	0		118
Gross unrealized losses, held to maturity securities	(1,701)		(13)
Fair value, held to maturity securities	10,878		7,154
Corporate Debt Securities [Member]
Amortized cost, available for sale securities			2,019
Gross unrealized gains, available for sale securities			1
Gross unrealized losses, available for sale securities			0
Debt Securities, Available-for-Sale, Total			$ 2,020
Amortized cost, held to maturity securities	3,000
Gross unrealized gains, held to maturity securities	0
Gross unrealized losses, held to maturity securities	(284)
Fair value, held to maturity securities	$ 2,716

X

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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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