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Note 7 - Debt Securities (Tables)

6 Months Ended

Jun. 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		$	8,893			$	387			$	-			$	9,280
U.S. government agencies			99,091				5,203				(6	)			104,288
U.S. government mortgage-backed securities			104,063				3,114				(27	)			107,150
State and political subdivisions			211,593				5,322				(118	)			216,797
Corporate bonds			71,319				4,793				(11	)			76,101
		$	494,959			$	18,819			$	(162	)		$	513,616

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		$	48,856			$	49,216
Due after one year through five years			234,542				243,595
Due after five years through ten years			181,220				189,531
Due after ten years			30,341				31,274
Total		$	494,959			$	513,616

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

		Three Months Ended								Six Months Ended
		June 30,								June 30,
		2020				2019				2020				2019
Proceeds from sales of securities available-for-sale		$	2,078			$	5,973			$	5,463			$	5,973
Gross realized gains on securities available-for-sale			44				21				430				21
Gross realized losses on securities available-for-sale			-				(19	)			-				(19	)
Tax provision applicable to net realized gains on securities available-for-sale			11				-				108				-

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			938				(6	)			-				-				938				(6	)
U.S. government mortgage-backed securities			11,784				(25	)			1,712				(2	)			13,496				(27	)
State and political subdivisions			6,697				(114	)			180				(4	)			6,877				(118	)
Corporate bonds			493				(11	)			-				-				493				(11	)
		$	19,912			$	(156	)		$	1,892			$	(6	)		$	21,804			$	(162	)

		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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