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Note 2 - Securities - Fair Value of Debt Security, Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Amortized Cost, available for sale	$ 628,729	$ 1,102,146
Gross Unrealized Gains, available for sale	0	11,534
Gross Unrealized Losses, available for sale	(98,636)	(14,795)
Fair Value, available for sale	530,093	1,098,885
Amortized Cost, held to maturity	428,205
Gross Unrealized Gains, held to maturity	0
Gross Unrealized Losses, held to maturity	(76,347)
Fair Value, held to maturity	351,858
US Treasury Securities [Member]
Amortized Cost, available for sale	90,926	93,267
Gross Unrealized Gains, available for sale	0	23
Gross Unrealized Losses, available for sale	(13,372)	(1,311)
Fair Value, available for sale	77,554	91,979
US Treasury and Government [Member]
Amortized Cost, available for sale	2,965	2,001
Gross Unrealized Gains, available for sale	0	7
Gross Unrealized Losses, available for sale	(415)	0
Fair Value, available for sale	2,550	2,008
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost, available for sale	281,298	528,252
Gross Unrealized Gains, available for sale	0	10,704
Gross Unrealized Losses, available for sale	(57,311)	(4,109)
Fair Value, available for sale	223,987	534,847
Amortized Cost, held to maturity	202,406
Gross Unrealized Gains, held to maturity	0
Gross Unrealized Losses, held to maturity	(42,485)
Fair Value, held to maturity	159,921
Collateralized Mortgage-Backed Securities [Member]
Amortized Cost, available for sale	242,095	441,383
Gross Unrealized Gains, available for sale	0	781
Gross Unrealized Losses, available for sale	(27,404)	(9,049)
Fair Value, available for sale	214,691	433,115
Amortized Cost, held to maturity	202,131
Gross Unrealized Gains, held to maturity	0
Gross Unrealized Losses, held to maturity	(31,296)
Fair Value, held to maturity	170,835
Corporate Debt Securities [Member]
Amortized Cost, available for sale	757	20,856
Gross Unrealized Gains, available for sale	0	19
Gross Unrealized Losses, available for sale	(41)	(233)
Fair Value, available for sale	716	20,642
Amortized Cost, held to maturity	19,597
Gross Unrealized Gains, held to maturity	0
Gross Unrealized Losses, held to maturity	(2,068)
Fair Value, held to maturity	17,529
Asset-Backed Securities [Member]
Amortized Cost, available for sale	13,653	16,387
Gross Unrealized Gains, available for sale	0	0
Gross Unrealized Losses, available for sale	(508)	(93)
Fair Value, available for sale	13,145	$ 16,294
Amortized Cost, held to maturity	1,106
Gross Unrealized Gains, held to maturity	0
Gross Unrealized Losses, held to maturity	(83)
Fair Value, held to maturity	$ 1,023

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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