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Note 6 - Debt Securities (Tables)

6 Months Ended

Jun. 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		$	224,177			$	1			$	(16,048	)		$	208,130
U.S. government agencies			116,945				13				(6,809	)			110,149
U.S. government mortgage-backed securities			144,619				16				(13,728	)			130,907
State and political subdivisions			322,916				120				(24,303	)			298,733
Corporate bonds			85,768				24				(5,322	)			80,470
		$	894,425			$	174			$	(66,210	)		$	828,389

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		$	36,141			$	36,012
Due after one year through five years			456,498				430,508
Due after five years through ten years			383,933				346,032
Due after ten years			17,853				15,837
Total		$	894,425			$	828,389

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

		Three Months Ended								Six Months Ended								Three Months Ended
		June 30,								June 30,								March 31,
		2022				2021				2022				2021				2022				2021
Proceeds from sales of securities available-for-sale		$	-			$	-			$	535			$	-			$	535			$	-
Gross realized gains on securities available-for-sale			-				-				35				-				35				-
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
2022:		Estimated Fair Value				Unrealized Losses				Estimated Fair Value				Unrealized Losses				Estimated Fair Value				Unrealized Losses
Securities available-for-sale:
U.S. government treasuries		$	195,931			$	(14,887	)		$	11,227			$	(1,161	)		$	207,158			$	(16,048	)
U.S. government agencies			94,147				(5,000	)			15,295				(1,809	)			109,442				(6,809	)
U.S. government mortgage-backed securities			81,207				(6,843	)			48,176				(6,885	)			129,383				(13,728	)
State and political subdivisions			248,471				(21,340	)			19,269				(2,963	)			267,740				(24,303	)
Corporate bonds			70,129				(5,090	)			1,396				(232	)			71,525				(5,322	)
		$	689,885			$	(53,160	)		$	95,363			$	(13,050	)		$	785,248			$	(66,210	)

		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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