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Note 6 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Amortized cost	$ 754,409	$ 575,636
Gross unrealized gains	14,135	21,444
Gross unrealized losses	(3,121)	(81)
Estimated fair value	765,423	596,999
US Treasury Securities [Member]
Amortized cost	138,401	11,725
Gross unrealized gains	350	328
Gross unrealized losses	(716)	0
Estimated fair value	138,035	12,053
US Government Agencies Debt Securities [Member]
Amortized cost	110,832	106,337
Gross unrealized gains	3,172	4,875
Gross unrealized losses	(436)	(13)
Estimated fair value	113,568	111,199
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized cost	158,104	146,889
Gross unrealized gains	1,839	3,337
Gross unrealized losses	(1,177)	(31)
Estimated fair value	158,766	150,195
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	271,918	243,438
Gross unrealized gains	5,429	8,182
Gross unrealized losses	(695)	(36)
Estimated fair value	276,652	251,584
Corporate Debt Securities [Member]
Amortized cost	75,154	67,247
Gross unrealized gains	3,345	4,722
Gross unrealized losses	(97)	(1)
Estimated fair value	$ 78,402	$ 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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