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Note 6 - Debt Securities (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

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

2023:						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
U.S. government treasuries		$	222,059			$	-			$	(16,546	)		$	205,513
U.S. government agencies			110,426				3				(7,780	)			102,649
U.S. government mortgage-backed securities			128,941				2				(14,817	)			114,126
State and political subdivisions			317,306				141				(25,587	)			291,860
Corporate bonds			80,851				3				(6,092	)			74,762
		$	859,583			$	149			$	(70,822	)		$	788,910

2022:						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
U.S. government treasuries		$	227,065			$	-			$	(19,468	)		$	207,597
U.S. government agencies			110,370				4				(9,441	)			100,933
U.S. government mortgage-backed securities			133,205				4				(16,468	)			116,741
State and political subdivisions			317,179				27				(31,203	)			286,003
Corporate bonds			82,177				7				(7,020	)			75,164
		$	869,996			$	42			$	(83,600	)		$	786,438

Investments Classified by Contractual Maturity Date [Table Text Block]

		Amortized				Estimated
		Cost				Fair Value
Due in one year or less		$	49,835			$	49,041
Due after one year through five years			411,718				384,474
Due after five years through ten years			256,813				230,655
Due after ten years			12,276				10,614
		$	730,642			$	674,784
U.S. government mortgage-backed securities			128,941				114,126
Total		$	859,583			$	788,910

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

		Three Months Ended
		March 31,
		2023				2022
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
		Estimated				Unrealized				Estimated				Unrealized				Estimated				Unrealized
2023:		Fair Value				Losses				Fair Value				Losses				Fair Value				Losses
Securities available-for-sale:
U.S. government treasuries		$	15,058			$	(403	)		$	190,455			$	(16,143	)		$	205,513			$	(16,546	)
U.S. government agencies			16,815				(341	)			85,231				(7,439	)			102,046				(7,780	)
U.S. government mortgage-backed securities			9,232				(456	)			104,381				(14,361	)			113,613				(14,817	)
State and political subdivisions			65,599				(1,727	)			209,541				(23,860	)			275,140				(25,587	)
Corporate bonds			32,664				(1,313	)			39,612				(4,779	)			72,276				(6,092	)
		$	139,368			$	(4,240	)		$	629,220			$	(66,582	)		$	768,588			$	(70,822	)

		Less than 12 Months								12 Months or More								Total
		Estimated				Unrealized				Estimated				Unrealized				Estimated				Unrealized
2022:		Fair Value				Losses				Fair Value				Losses				Fair Value				Losses
Securities available-for-sale:
U.S. government treasuries		$	57,882			$	(3,960	)		$	147,215			$	(15,508	)		$	205,097			$	(19,468	)
U.S. government agencies			61,821				(4,293	)			38,492				(5,148	)			100,313				(9,441	)
U.S. government mortgage-backed securities			45,440				(4,393	)			70,854				(12,075	)			116,294				(16,468	)
State and political subdivisions			181,640				(14,556	)			97,907				(16,647	)			279,547				(31,203	)
Corporate bonds			59,293				(4,281	)			13,382				(2,739	)			72,675				(7,020	)
		$	406,076			$	(31,483	)		$	367,850			$	(52,117	)		$	773,926			$	(83,600	)

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