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Note 6 - Debt Securities (Tables)

3 Months Ended

Mar. 31, 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		$	45,829			$	285			$	(413	)		$	45,701
U.S. government agencies			106,288				3,237				(424	)			109,101
U.S. government mortgage-backed securities			181,313				2,225				(1,841	)			181,697
State and political subdivisions			259,256				4,535				(1,312	)			262,479
Corporate bonds			70,128				3,329				(91	)			73,366
		$	662,814			$	13,611			$	(4,081	)		$	672,344

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		$	45,605			$	45,892
Due after one year through five years			268,458				275,228
Due after five years through ten years			303,771				306,179
Due after ten years			44,980				45,045
Total		$	662,814			$	672,344

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

		Three Months Ended
		March 31,
		2021				2020
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			-				-

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		$	36,924			$	(413	)		$	-			$	-			$	36,924			$	(413	)
U.S. government agencies			20,716				(418	)			875				(6	)			21,591				(424	)
U.S. government mortgage-backed securities			113,380				(1,841	)			-				-				113,380				(1,841	)
State and political subdivisions			73,842				(1,309	)			503				(3	)			74,345				(1,312	)
Corporate bonds			3,337				(91	)			-				-				3,337				(91	)
		$	248,199			$	(4,072	)		$	1,378			$	(9	)		$	249,577			$	(4,081	)

		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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