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Note 4 - Debt Securities - Securities Available-for-sale (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Amortized cost	$ 575,636,000	$ 474,357,000
Gross unrealized gains	21,444,000	5,934,000
Gross unrealized losses	(81,000)	(448,000)
Estimated fair value	596,999,072	479,843,448
US Treasury Securities [Member]
Amortized cost	11,725,000	9,392,000
Gross unrealized gains	328,000	64,000
Gross unrealized losses	0	(4,000)
Estimated fair value	12,053,000	9,452,000
US Government Agencies Debt Securities [Member]
Amortized cost	106,337,000	124,913,000
Gross unrealized gains	4,875,000	1,609,000
Gross unrealized losses	(13,000)	(89,000)
Estimated fair value	111,199,000	126,433,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized cost	146,889,000	80,295,000
Gross unrealized gains	3,337,000	867,000
Gross unrealized losses	(31,000)	(34,000)
Estimated fair value	150,195,000	81,128,000
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	243,438,000	193,745,000
Gross unrealized gains	8,182,000	1,852,000
Gross unrealized losses	(36,000)	(295,000)
Estimated fair value	251,584,000	195,302,000
Corporate Debt Securities [Member]
Amortized cost	67,247,000	66,012,000
Gross unrealized gains	4,722,000	1,542,000
Gross unrealized losses	(1,000)	(26,000)
Estimated fair value	$ 71,968,000	$ 67,528,000

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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