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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	Dec. 31, 2021	Dec. 31, 2020
Amortized Cost	$ 1,102,146	$ 560,828
Gross Unrealized Gains	11,534	14,856
Gross Unrealized Losses	(14,795)	(897)
Securities available for sale	1,098,885	574,787
US Treasury and Government [Member]
Amortized Cost	2,001	2,007
Gross Unrealized Gains	7	44
Gross Unrealized Losses	0	0
Securities available for sale	2,008	2,051
US Treasury Securities [Member]
Amortized Cost	93,267	1,996
Gross Unrealized Gains	23	60
Gross Unrealized Losses	(1,311)	0
Securities available for sale	91,979	2,056
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	528,252	307,201
Gross Unrealized Gains	10,704	13,191
Gross Unrealized Losses	(4,109)	(24)
Securities available for sale	534,847	320,368
Collateralized Mortgage Backed Securities [Member]
Amortized Cost	441,383	246,085
Gross Unrealized Gains	781	1,510
Gross Unrealized Losses	(9,049)	(872)
Securities available for sale	433,115	246,723
Corporate Debt Securities [Member]
Amortized Cost	20,856	3,539
Gross Unrealized Gains	19	51
Gross Unrealized Losses	(233)	(1)
Securities available for sale	20,642	$ 3,589
Asset-backed Securities [Member]
Amortized Cost	16,387
Gross Unrealized Gains	0
Gross Unrealized Losses	(93)
Securities available for sale	$ 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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