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Note 2 - Securities - Fair Value of Securities Available for Sale and The Related Unrealized Gains and Losses Recognized in Accumulated Comprehensive Income (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Amortized Cost, available for sale	$ 640,084	$ 1,102,146
Gross Unrealized Gains, available for sale	39	11,534
Gross Unrealized Losses, available for sale	(73,981)	(14,795)
Fair Value, available for sale	566,142	1,098,885
US Treasury and Government [Member]
Amortized Cost, available for sale	2,963	2,001
Gross Unrealized Gains, available for sale	0	7
Gross Unrealized Losses, available for sale	(283)	0
Fair Value, available for sale	2,680	2,008
US Treasury Securities [Member]
Amortized Cost, available for sale	93,040	93,267
Gross Unrealized Gains, available for sale	0	23
Gross Unrealized Losses, available for sale	(9,397)	(1,311)
Fair Value, available for sale	83,643	91,979
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost, available for sale	300,824	528,252
Gross Unrealized Gains, available for sale	34	10,704
Gross Unrealized Losses, available for sale	(44,197)	(4,109)
Fair Value, available for sale	256,661	534,847
Collateralized Mortgage-Backed Securities [Member]
Amortized Cost, available for sale	230,842	441,383
Gross Unrealized Gains, available for sale	5	781
Gross Unrealized Losses, available for sale	(19,719)	(9,049)
Fair Value, available for sale	211,128	433,115
Corporate Debt Securities [Member]
Amortized Cost, available for sale	1,256	20,856
Gross Unrealized Gains, available for sale	0	19
Gross Unrealized Losses, available for sale	(18)	(233)
Fair Value, available for sale	1,238	20,642
Asset-Backed Securities [Member]
Amortized Cost, available for sale	14,122	16,387
Gross Unrealized Gains, available for sale	0	0
Gross Unrealized Losses, available for sale	(650)	(93)
Fair Value, available for sale	$ 13,472	$ 16,294

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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