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Note 6 - Debt Securities (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

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

2021:						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
U.S. government treasuries		$	100,543			$	382			$	(378	)		$	100,547
U.S. government agencies			113,012				3,703				(357	)			116,358
U.S. government mortgage-backed securities			168,068				2,013				(1,344	)			168,737
State and political subdivisions			270,241				5,692				(728	)			275,205
Corporate bonds			75,693				3,619				(57	)			79,255
		$	727,557			$	15,409			$	(2,864	)		$	740,102

2020:						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
U.S. government treasuries		$	11,725			$	328			$	-			$	12,053
U.S. government agencies			106,337				4,875				(13	)			111,199
U.S. government mortgage-backed securities			146,889				3,337				(31	)			150,195
State and political subdivisions			243,438				8,182				(36	)			251,584
Corporate bonds			67,247				4,722				(1	)			71,968
		$	575,636			$	21,444			$	(81	)		$	596,999

Investments Classified by Contractual Maturity Date [Table Text Block]

		Amortized				Estimated
		Cost				Fair Value
Due in one year or less		$	57,814			$	58,258
Due after one year through five years			295,926				302,378
Due after five years through ten years			337,265				342,042
Due after ten years			36,552				37,424
Total		$	727,557			$	740,102

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

		Three Months Ended								Six Months Ended
		June 30,								June 30,
		2021				2020				2021				2020
Proceeds from sales of securities available-for-sale		$	-			$	2,078			$	-			$	5,463
Gross realized gains on securities available-for-sale			-				44				-				430
Gross realized losses on securities available-for-sale			-				-				-				-

Schedule of Unrealized Loss on Investments [Table Text Block]

		Less than 12 Months								12 Months or More								Total
2021:		Estimated Fair Value				Unrealized Losses				Estimated Fair Value				Unrealized Losses				Estimated Fair Value				Unrealized Losses
Securities available-for-sale:
U.S. government treasuries		$	56,269			$	(378	)		$	-			$	-			$	56,269			$	(378	)
U.S. government agencies			24,179				(357	)			-				-				24,179				(357	)
U.S. government mortgage-backed securities			105,041				(1,344	)			-				-				105,041				(1,344	)
State and political subdivisions			57,806				(727	)			181				(1	)			57,987				(728	)
Corporate bonds			4,320				(57	)			-				-				4,320				(57	)
		$	247,615			$	(2,863	)		$	181			$	(1	)		$	247,796			$	(2,864	)

		Less than 12 Months								12 Months or More								Total
2020:		Fair Value				Unrealized Losses				Fair Value				Unrealized Losses				Fair Value				Unrealized Losses
Securities available-for-sale:
U.S. government agencies		$	6,016			$	(7	)		$	896			$	(6	)		$	6,912			$	(13	)
U.S. government mortgage-backed securities			5,097				(31	)			-				-				5,097				(31	)
State and political subdivisions			7,875				(34	)			180				(2	)			8,055				(36	)
Corporate bonds			534				(1	)			-				-				534				(1	)
		$	19,522			$	(73	)		$	1,076			$	(8	)		$	20,598			$	(81	)

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