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Note 6 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Amortized cost	$ 880,443	$ 827,185
Gross unrealized gains	16	10,321
Gross unrealized losses	(96,492)	(6,503)
Estimated fair value	783,967	831,003
US Treasury Securities [Member]
Amortized cost	230,063	192,323
Gross unrealized gains	0	239
Gross unrealized losses	(21,977)	(2,083)
Estimated fair value	208,086	190,479
US Government Agencies Debt Securities [Member]
Amortized cost	114,018	114,531
Gross unrealized gains	5	2,235
Gross unrealized losses	(10,380)	(752)
Estimated fair value	103,643	116,014
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized cost	138,117	149,896
Gross unrealized gains	6	1,375
Gross unrealized losses	(19,766)	(1,670)
Estimated fair value	118,357	149,601
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	316,532	290,548
Gross unrealized gains	5	4,035
Gross unrealized losses	(36,048)	(1,724)
Estimated fair value	280,489	292,859
Corporate Debt Securities [Member]
Amortized cost	81,713	79,887
Gross unrealized gains	0	2,437
Gross unrealized losses	(8,321)	(274)
Estimated fair value	$ 73,392	$ 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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