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Note 3 - Investment Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Securities available-for-sale, amortized cost	$ 1,254,650	$ 1,190,379
Securities available-for-sale, unrealized gains	876	5,281
Securities available-for-sale, unrealized losses	(115,487)	(15,362)
Securities available-for-sale, fair value	1,140,039	1,180,298
US Treasury Securities and US Government Agencies Debt Securities [Member]
Securities available-for-sale, amortized cost	121,846	123,753
Securities available-for-sale, unrealized gains	0	0
Securities available-for-sale, unrealized losses	(6,314)	(1,252)
Securities available-for-sale, fair value	115,532	122,501
US Government-sponsored Enterprises Debt Securities [Member]
Securities available-for-sale, amortized cost	120,954	132,760
Securities available-for-sale, unrealized gains	625	2,497
Securities available-for-sale, unrealized losses	(3,876)	(236)
Securities available-for-sale, fair value	117,703	135,021
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available-for-sale, amortized cost	857,086	857,283
Securities available-for-sale, unrealized gains	245	2,495
Securities available-for-sale, unrealized losses	(91,809)	(13,154)
Securities available-for-sale, fair value	765,522	846,624
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale, amortized cost	148,543	75,488
Securities available-for-sale, unrealized gains	6	289
Securities available-for-sale, unrealized losses	(13,281)	(702)
Securities available-for-sale, fair value	135,268	75,075
Other Debt Obligations [Member]
Securities available-for-sale, amortized cost	6,221	1,095
Securities available-for-sale, unrealized gains	0	0
Securities available-for-sale, unrealized losses	(207)	(18)
Securities available-for-sale, fair value	$ 6,014	$ 1,077

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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