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Note 6 - Debt Securities (Tables)

3 Months Ended

Mar. 31, 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		$	212,757			$	16			$	(11,886	)		$	200,887
U.S. government agencies			116,513				99				(4,444	)			112,168
U.S. government mortgage-backed securities			151,333				90				(8,916	)			142,507
State and political subdivisions			302,881				296				(13,964	)			289,213
Corporate bonds			81,664				235				(2,777	)			79,122
		$	865,148			$	736			$	(41,987	)		$	823,897

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		$	43,084			$	43,195
Due after one year through five years			459,166				439,613
Due after five years through ten years			340,100				319,708
Due after ten years			22,798				21,381
Total		$	865,148			$	823,897

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

		Three Months Ended
		March 31,
		2022				2021
Proceeds from sales of securities available-for-sale		$	535			$	-
Gross realized gains on securities available-for-sale			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		$	181,570			$	(10,962	)		$	11,487			$	(924	)		$	193,057			$	(11,886	)
U.S. government agencies			77,732				(3,006	)			15,671				(1,438	)			93,403				(4,444	)
U.S. government mortgage-backed securities			82,105				(4,063	)			51,997				(4,853	)			134,102				(8,916	)
State and political subdivisions			218,589				(11,894	)			19,703				(2,070	)			238,292				(13,964	)
Corporate bonds			43,356				(2,603	)			1,460				(174	)			44,816				(2,777	)
		$	603,352			$	(32,528	)		$	100,318			$	(9,459	)		$	703,670			$	(41,987	)

		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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