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Note 6 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Amortized cost	$ 727,557	$ 575,636
Gross unrealized gains	15,409	21,444
Gross unrealized losses	(2,864)	(81)
Estimated fair value	740,102	596,999
US Treasury Securities [Member]
Amortized cost	100,543	11,725
Gross unrealized gains	382	328
Gross unrealized losses	(378)	0
Estimated fair value	100,547	12,053
US Government Agencies Debt Securities [Member]
Amortized cost	113,012	106,337
Gross unrealized gains	3,703	4,875
Gross unrealized losses	(357)	(13)
Estimated fair value	116,358	111,199
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized cost	168,068	146,889
Gross unrealized gains	2,013	3,337
Gross unrealized losses	(1,344)	(31)
Estimated fair value	168,737	150,195
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	270,241	243,438
Gross unrealized gains	5,692	8,182
Gross unrealized losses	(728)	(36)
Estimated fair value	275,205	251,584
Corporate Debt Securities [Member]
Amortized cost	75,693	67,247
Gross unrealized gains	3,619	4,722
Gross unrealized losses	(57)	(1)
Estimated fair value	$ 79,255	$ 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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