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Note 7 - Debt Securities (Tables)

9 Months Ended

Sep. 30, 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		$	8,492			$	364			$	-			$	8,856
U.S. government agencies			92,650				5,340				(6	)			97,984
U.S. government mortgage-backed securities			130,706				3,140				(50	)			133,796
State and political subdivisions			226,574				7,024				(35	)			233,563
Corporate bonds			69,744				4,875				-				74,619
		$	528,166			$	20,743			$	(91	)		$	548,818

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		$	46,260			$	46,694
Due after one year through five years			226,833				236,081
Due after five years through ten years			211,689				220,972
Due after ten years			43,384				45,071
Total		$	528,166			$	548,818

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

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2020				2019				2020				2019
Proceeds from sales of securities available-for-sale		$	-			$	2,238			$	5,463			$	8,211
Gross realized gains on securities available-for-sale			-				16				430				37
Gross realized losses on securities available-for-sale			-				(1	)			-				(20	)
Tax provision applicable to net realized gains on securities available-for-sale			-				4				108				4

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 agencies		$	-			$	-			$	917			$	(6	)		$	917			$	(6	)
U.S. government mortgage-backed securities			21,671				(50	)			-				-				21,671				(50	)
State and political subdivisions			5,924				(32	)			180				(3	)			6,104				(35	)
		$	27,595			$	(82	)		$	1,097			$	(9	)		$	28,692			$	(91	)

		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	)

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