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Note 6 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Amortized cost	$ 865,148	$ 827,185
Gross unrealized gains	736	10,321
Gross unrealized losses	(41,987)	(6,503)
Estimated fair value	823,897	831,003
US Treasury Securities [Member]
Amortized cost	212,757	192,323
Gross unrealized gains	16	239
Gross unrealized losses	(11,886)	(2,083)
Estimated fair value	200,887	190,479
US Government Agencies Debt Securities [Member]
Amortized cost	116,513	114,531
Gross unrealized gains	99	2,235
Gross unrealized losses	(4,444)	(752)
Estimated fair value	112,168	116,014
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized cost	151,333	149,896
Gross unrealized gains	90	1,375
Gross unrealized losses	(8,916)	(1,670)
Estimated fair value	142,507	149,601
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	302,881	290,548
Gross unrealized gains	296	4,035
Gross unrealized losses	(13,964)	(1,724)
Estimated fair value	289,213	292,859
Corporate Debt Securities [Member]
Amortized cost	81,664	79,887
Gross unrealized gains	235	2,437
Gross unrealized losses	(2,777)	(274)
Estimated fair value	$ 79,122	$ 82,050

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).

+ References

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