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Note 2 - Securities - Fair Value of Debt Security, Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost, available for sale	$ 683,843	$ 1,102,146
Gross Unrealized Gains, available for sale	474	11,534
Gross Unrealized Losses, available for sale	(43,269)	(14,795)
Fair Value, available for sale	641,048	1,098,885
Amortized Cost, held to maturity	429,918
Gross Unrealized Gains, held to maturity	32
Gross Unrealized Losses, held to maturity	(32,039)
Fair Value, held to maturity	397,911
US Treasury and Government [Member]
Amortized Cost, available for sale	0	2,001
Gross Unrealized Gains, available for sale	0	7
Gross Unrealized Losses, available for sale	0	0
Fair Value, available for sale	0	2,008
Amortized Cost, held to maturity	2,962
Gross Unrealized Gains, held to maturity	0
Gross Unrealized Losses, held to maturity	(195)
Fair Value, held to maturity	2,767
US Treasury Securities [Member]
Amortized Cost, available for sale	93,154	93,267
Gross Unrealized Gains, available for sale	8	23
Gross Unrealized Losses, available for sale	(6,671)	(1,311)
Fair Value, available for sale	86,491	91,979
Amortized Cost, held to maturity	0
Gross Unrealized Gains, held to maturity	0
Gross Unrealized Losses, held to maturity	0
Fair Value, held to maturity	0
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost, available for sale	334,907	528,252
Gross Unrealized Gains, available for sale	443	10,704
Gross Unrealized Losses, available for sale	(22,962)	(4,109)
Fair Value, available for sale	312,388	534,847
Amortized Cost, held to maturity	204,201
Gross Unrealized Gains, held to maturity	2
Gross Unrealized Losses, held to maturity	(17,668)
Fair Value, held to maturity	186,535
Collateralized Mortgage-Backed Securities [Member]
Amortized Cost, available for sale	240,062	441,383
Gross Unrealized Gains, available for sale	19	781
Gross Unrealized Losses, available for sale	(13,412)	(9,049)
Fair Value, available for sale	226,669	433,115
Amortized Cost, held to maturity	204,165
Gross Unrealized Gains, held to maturity	30
Gross Unrealized Losses, held to maturity	(13,533)
Fair Value, held to maturity	190,662
Corporate Debt Securities [Member]
Amortized Cost, available for sale	1,255	20,856
Gross Unrealized Gains, available for sale	4	19
Gross Unrealized Losses, available for sale	(4)	(233)
Fair Value, available for sale	1,255	20,642
Amortized Cost, held to maturity	17,161
Gross Unrealized Gains, held to maturity	0
Gross Unrealized Losses, held to maturity	(606)
Fair Value, held to maturity	16,555
Asset-Backed Securities [Member]
Amortized Cost, available for sale	14,465	16,387
Gross Unrealized Gains, available for sale	0	0
Gross Unrealized Losses, available for sale	(220)	(93)
Fair Value, available for sale	14,245	$ 16,294
Amortized Cost, held to maturity	1,429
Gross Unrealized Gains, held to maturity	0
Gross Unrealized Losses, held to maturity	(37)
Fair Value, held to maturity	$ 1,392

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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