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Note 2 - Investment Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale, Amortized Cost	$ 1,091,348	$ 1,154,153
Securities available-for-sale, unrealized gains	148	245
Securities available-for-sale, unrealized losses	(129,868)	(123,219)
Securities available-for-sale, fair value	961,628	1,031,179
US Treasury Securities and US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	119,979	119,931
Securities available-for-sale, unrealized gains	0	0
Securities available-for-sale, unrealized losses	(1,104)	(3,662)
Securities available-for-sale, fair value	118,875	116,269
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	93,747	104,677
Securities available-for-sale, unrealized gains	147	157
Securities available-for-sale, unrealized losses	(5,159)	(4,987)
Securities available-for-sale, fair value	88,735	99,847
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Debt Securities, Available-for-Sale, Amortized Cost	740,453	789,145
Securities available-for-sale, unrealized gains	0	83
Securities available-for-sale, unrealized losses	(108,373)	(101,189)
Securities available-for-sale, fair value	632,080	688,039
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	133,418	136,579
Securities available-for-sale, unrealized gains	1	5
Securities available-for-sale, unrealized losses	(15,009)	(13,094)
Securities available-for-sale, fair value	118,410	123,490
Other Debt Obligations [Member]
Debt Securities, Available-for-Sale, Amortized Cost	3,751	3,821
Securities available-for-sale, unrealized gains	0	0
Securities available-for-sale, unrealized losses	(223)	(287)
Securities available-for-sale, fair value	$ 3,528	$ 3,534

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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