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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	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost	$ 1,025,621	$ 560,828
Gross Unrealized Gains	11,901	14,856
Gross Unrealized Losses	(9,407)	(897)
Fair Value	1,028,115	574,787
US Treasury and Government [Member]
Amortized Cost	2,002	2,007
Gross Unrealized Gains	18	44
Gross Unrealized Losses	0	0
Fair Value	2,020	2,051
US Treasury Securities [Member]
Amortized Cost	93,381	1,996
Gross Unrealized Gains	58	60
Gross Unrealized Losses	(653)	0
Fair Value	92,786	2,056
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	488,858	307,201
Gross Unrealized Gains	10,584	13,191
Gross Unrealized Losses	(2,704)	(24)
Fair Value	496,738	320,368
Collateralized Mortgage Backed Securities [Member]
Amortized Cost	411,376	246,085
Gross Unrealized Gains	1,207	1,510
Gross Unrealized Losses	(5,887)	(872)
Fair Value	406,696	246,723
Corporate Debt Securities [Member]
Amortized Cost	13,107	3,539
Gross Unrealized Gains	31	51
Gross Unrealized Losses	(125)	(1)
Fair Value	13,013	3,589
Asset-backed Securities [Member]
Amortized Cost	16,897
Gross Unrealized Gains	3
Gross Unrealized Losses	(38)
Fair Value	$ 16,862	$ 0

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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