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Note 6 - Debt Securities (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

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

2022:						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
U.S. government treasuries		$	230,063			$	-			$	(21,977	)		$	208,086
U.S. government agencies			114,018				5				(10,380	)			103,643
U.S. government mortgage-backed securities			138,117				6				(19,766	)			118,357
State and political subdivisions			316,532				5				(36,048	)			280,489
Corporate bonds			81,713				-				(8,321	)			73,392
		$	880,443			$	16			$	(96,492	)		$	783,967
2021:						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
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
		$	827,185			$	10,321			$	(6,503	)		$	831,003

Investments Classified by Contractual Maturity Date [Table Text Block]

		Amortized				Estimated
		Cost				Fair Value
Due in one year or less		$	32,318			$	32,029
Due after one year through five years			452,629				414,093
Due after five years through ten years			382,700				326,965
Due after ten years			12,796				10,880
Total		$	880,443			$	783,967

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

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2022				2021				2022				2021
Proceeds from sales of securities available-for-sale		$	10,013			$	622			$	10,548			$	622
Gross realized gains on securities available-for-sale			25				24				60				24
Gross realized losses on securities available-for-sale			(23	)			-				(23	)			-

Schedule of Unrealized Loss on Investments [Table Text Block]

		Less than 12 Months								12 Months or More								Total
2022:		Estimated Fair Value				Unrealized Losses				Estimated Fair Value				Unrealized Losses				Estimated Fair Value				Unrealized Losses
Securities available-for-sale:
U.S. government treasuries		$	119,179			$	(10,309	)		$	88,907			$	(11,668	)		$	208,086			$	(21,977	)
U.S. government agencies			76,888				(6,433	)			26,095				(3,947	)			102,983				(10,380	)
U.S. government mortgage-backed securities			47,837				(5,541	)			69,785				(14,225	)			117,622				(19,766	)
State and political subdivisions			218,288				(23,921	)			59,639				(12,127	)			277,927				(36,048	)
Corporate bonds			63,812				(6,032	)			9,580				(2,289	)			73,392				(8,321	)
		$	526,004			$	(52,236	)		$	254,006			$	(44,256	)		$	780,010			$	(96,492	)
		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		$	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	)
		$	417,733			$	(6,174	)		$	10,085			$	(329	)		$	427,818			$	(6,503	)

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