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Note 2 - Investment Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale, Amortized Cost	$ 958,606	$ 1,154,153
Securities available-for-sale, unrealized gains	385	245
Securities available-for-sale, unrealized losses	(97,159)	(123,219)
Securities available-for-sale, fair value	861,832	1,031,179
US Treasury Securities and US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	19,999	119,931
Securities available-for-sale, unrealized gains	0	0
Securities available-for-sale, unrealized losses	(33)	(3,662)
Securities available-for-sale, fair value	19,966	116,269
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	90,295	104,677
Securities available-for-sale, unrealized gains	127	157
Securities available-for-sale, unrealized losses	(3,527)	(4,987)
Securities available-for-sale, fair value	86,895	99,847
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Debt Securities, Available-for-Sale, Amortized Cost	714,538	789,145
Securities available-for-sale, unrealized gains	253	83
Securities available-for-sale, unrealized losses	(82,543)	(101,189)
Securities available-for-sale, fair value	632,248	688,039
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	130,055	136,579
Securities available-for-sale, unrealized gains	5	5
Securities available-for-sale, unrealized losses	(10,863)	(13,094)
Securities available-for-sale, fair value	119,197	123,490
Other Debt Obligations [Member]
Debt Securities, Available-for-Sale, Amortized Cost	3,719	3,821
Securities available-for-sale, unrealized gains	0	0
Securities available-for-sale, unrealized losses	(193)	(287)
Securities available-for-sale, fair value	$ 3,526	$ 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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