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Note 7 - Debt and Equity Securities (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

2020:						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value

U.S. government treasuries		$	9,393			$	378			$	-			$	9,771
U.S. government agencies			109,659				3,886				(62	)			113,483
U.S. government mortgage-backed securities			82,826				3,165				(6	)			85,985
State and political subdivisions			207,276				788				(2,306	)			205,758
Corporate bonds			74,179				1,075				(947	)			74,307
		$	483,333			$	9,292			$	(3,321	)		$	489,304

2019:						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value

U.S. government treasuries		$	9,392			$	64			$	(4	)		$	9,452
U.S. government agencies			124,913				1,609				(89	)			126,433
U.S. government mortgage-backed securities			80,295				867				(34	)			81,128
State and political subdivisions			193,745				1,852				(295	)			195,302
Corporate bonds			66,012				1,542				(26	)			67,528
		$	474,357			$	5,934			$	(448	)		$	479,843

Investments Classified by Contractual Maturity Date [Table Text Block]

		Amortized				Estimated
		Cost				Fair Value

Due in one year or less		$	64,579			$	64,569
Due after one year through five years			243,384				248,125
Due after five years through ten years			138,192				140,093
Due after ten years			37,178				36,517
Total		$	483,333			$	489,304

Schedule of Realized Gain (Loss) [Table Text Block]

		Three Months Ended
		March 31,
		2020				2019
Proceeds from sales of securities available-for-sale		$	3,385			$	-
Gross realized gains on securities available-for-sale			386				-
Gross realized losses on securities available-for-sale			-				-
Tax provision applicable to net realized gains on securities available-for-sale			97				-

Schedule of Unrealized Loss on Investments [Table Text Block]

		Less than 12 Months								12 Months or More								Total
2020:		Estimated Fair Value				Unrealized Losses				Estimated Fair Value				Unrealized Losses				Estimated Fair Value				Unrealized Losses

Securities available-for-sale:
U.S. government treasuries		$	-			$	-			$	-			$	-			$	-			$	-
U.S. government agencies			3,921				(62	)			-				-				3,921				(62	)
U.S. government mortgage-backed securities			-				-				1,734				(6	)			1,734				(6	)
State and political subdivisions			106,027				(2,298	)			176				(8	)			106,203				(2,306	)
Corporate bonds			37,547				(947	)			-				-				37,547				(947	)
		$	147,495			$	(3,307	)		$	1,910			$	(14	)		$	149,405			$	(3,321	)

		Less than 12 Months								12 Months or More								Total
2019:		Fair Value				Unrealized Losses				Fair Value				Unrealized Losses				Fair Value				Unrealized Losses

Securities available-for-sale:
U.S. government treasuries		$	3,023			$	(4	)		$	-			$	-			$	3,023			$	(4	)
U.S. government agencies			23,827				(85	)			2,520				(4	)			26,347				(89	)
U.S. government mortgage-backed securities			14,885				(28	)			1,934				(6	)			16,819				(34	)
State and political subdivisions			17,512				(125	)			5,954				(170	)			23,466				(295	)
Corporate bonds			4,129				(26	)			-				-				4,129				(26	)
		$	63,376			$	(268	)		$	10,408			$	(180	)		$	73,784			$	(448	)