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Note 6 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized cost	$ 662,814	$ 575,636
Gross unrealized gains	13,611	21,444
Gross unrealized losses	(4,081)	(81)
Estimated fair value	672,344	596,999
US Treasury Securities [Member]
Amortized cost	45,829	11,725
Gross unrealized gains	285	328
Gross unrealized losses	(413)	0
Estimated fair value	45,701	12,053
US Government Agencies Debt Securities [Member]
Amortized cost	106,288	106,337
Gross unrealized gains	3,237	4,875
Gross unrealized losses	(424)	(13)
Estimated fair value	109,101	111,199
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized cost	181,313	146,889
Gross unrealized gains	2,225	3,337
Gross unrealized losses	(1,841)	(31)
Estimated fair value	181,697	150,195
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	259,256	243,438
Gross unrealized gains	4,535	8,182
Gross unrealized losses	(1,312)	(36)
Estimated fair value	262,479	251,584
Corporate Debt Securities [Member]
Amortized cost	70,128	67,247
Gross unrealized gains	3,329	4,722
Gross unrealized losses	(91)	(1)
Estimated fair value	$ 73,366	$ 71,968

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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