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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, 2021	Dec. 31, 2020
Amortized Cost	$ 846,889	$ 560,828
Gross Unrealized Gains	14,484	14,856
Gross Unrealized Losses	(5,818)	(897)
Fair Value	855,555	574,787
US Treasury and Government [Member]
Amortized Cost	2,004	2,007
Gross Unrealized Gains	26	44
Gross Unrealized Losses	0	0
Fair Value	2,030	2,051
US Treasury Securities [Member]
Amortized Cost	37,195	1,996
Gross Unrealized Gains	166	60
Gross Unrealized Losses	0	0
Fair Value	37,361	2,056
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	476,698	307,201
Gross Unrealized Gains	12,657	13,191
Gross Unrealized Losses	(1,914)	(24)
Fair Value	487,441	320,368
Collateralized Mortgage Backed Securities [Member]
Amortized Cost	320,612	246,085
Gross Unrealized Gains	1,596	1,510
Gross Unrealized Losses	(3,895)	(872)
Fair Value	318,313	246,723
Corporate Debt Securities [Member]
Amortized Cost	8,303	3,539
Gross Unrealized Gains	39	51
Gross Unrealized Losses	0	(1)
Fair Value	8,342	3,589
Asset-backed Securities [Member]
Amortized Cost	2,077
Gross Unrealized Gains	0
Gross Unrealized Losses	(9)
Fair Value	$ 2,068	$ 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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