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Note 3 - Debt Securities (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
2021:
U.S. government treasuries		$	192,323			$	239			$	(2,083	)		$	190,479
U.S. government agencies			114,531				2,235				(752	)			116,014
U.S. government mortgage-backed securities			149,896				1,375				(1,670	)			149,601
State and political subdivisions			290,548				4,035				(1,724	)			292,859
Corporate bonds			79,887				2,437				(274	)			82,050
Total		$	827,185			$	10,321			$	(6,503	)		$	831,003

						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
2020:
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
Total		$	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		$	52,575			$	53,012
Due after one year through five years			421,355				422,429
Due after five years through ten years			328,324				330,727
Due after ten years			24,931				24,835
Total		$	827,185			$	831,003

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

		2021				2020
Proceeds from sales of securities available-for-sale		$	622			$	5,463
Gross realized gains on securities available-for-sale			24				430
Gross realized losses on securities available-for-sale			-				-

Schedule of Unrealized Loss on Investments [Table Text Block]

2021:		Less than 12 Months								12 Months or More								Total
		Estimated				Gross				Estimated				Gross				Estimated				Gross
		Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
		Value				Losses				Value				Losses				Value				Losses
Securities available for sale:
U.S. government treasuries		$	163,206			$	(2,083	)		$	-			$	-			$	163,206			$	(2,083	)
U.S. government agencies			30,647				(570	)			5,836				(182	)			36,483				(752	)
U.S. government mortgage-backed securities			92,192				(1,580	)			2,524				(90	)			94,716				(1,670	)
State and political subdivisions			115,204				(1,667	)			1,725				(57	)			116,929				(1,724	)
Corporate bonds			16,484				(274	)			-				-				16,484				(274	)
Total		$	417,733			$	(6,174	)		$	10,085			$	(329	)		$	427,818			$	(6,503	)

2020:		Less than 12 Months								12 Months or More								Total
		Estimated				Gross				Estimated				Gross				Estimated				Gross
		Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
		Value				Losses				Value				Losses				Value				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	)
Total		$	19,522			$	(73	)		$	1,076			$	(8	)		$	20,598			$	(81	)

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