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Note 3 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amortized cost	$ 827,185	$ 575,636
Gross unrealized gains	10,321	21,444
Gross unrealized losses	(6,503)	(81)
Estimated fair value	831,003	596,999
US Treasury Securities [Member]
Amortized cost	192,323	11,725
Gross unrealized gains	239	328
Gross unrealized losses	(2,083)	0
Estimated fair value	190,479	12,053
US Government Agencies Debt Securities [Member]
Amortized cost	114,531	106,337
Gross unrealized gains	2,235	4,875
Gross unrealized losses	(752)	(13)
Estimated fair value	116,014	111,199
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized cost	149,896	146,889
Gross unrealized gains	1,375	3,337
Gross unrealized losses	(1,670)	(31)
Estimated fair value	149,601	150,195
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	290,548	243,438
Gross unrealized gains	4,035	8,182
Gross unrealized losses	(1,724)	(36)
Estimated fair value	292,859	251,584
Corporate Debt Securities [Member]
Amortized cost	79,887	67,247
Gross unrealized gains	2,437	4,722
Gross unrealized losses	(274)	(1)
Estimated fair value	$ 82,050	$ 71,968

X

- Definition

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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