Note 3 - Securities (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

Debt Securities, Available-for-Sale [Table Text Block]

	March 31, 2023
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Allowance for Credit Losses		Fair Value
Available for Sale:
U.S. Treasuries	$	993	$	-	$	46	$	-	$	947
U.S. Government agencies and corporations		382,592		-		48,648		-		333,944
States and political subdivisions		181,214		3		31,255		-		149,962
Mortgage-backed securities		167,964		-		7,511		-		160,453
Corporate debt securities		6,502		-		761		-		5,741
Total securities available for sale	$	739,265	$	3	$	88,221	$	-	$	651,047

	December 31, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available for Sale:
U.S. Treasuries	$	992	$	-	$	56	$	936
U.S. Government agencies and corporations		391,538		39		55,002		336,575
States and political subdivisions		190,192		26		38,018		152,200
Mortgage-backed securities		170,694		22		9,239		161,477
Corporate debt securities		6,501		-		837		5,664
Total securities available for sale	$	759,917	$	87	$	103,152	$	656,852

Investments Classified by Contractual Maturity Date [Table Text Block]

	March 31, 2023
	Amortized Cost		Fair Value
Available for Sale:
Due in one year or less	$	3,229	$	3,172
Due after one year through five years		148,141		138,200
Due after five years through ten years		316,859		273,664
Due after ten years		271,036		236,011
Total securities available for sale	$	739,265	$	651,047

Schedule of Temporary Impairment Losses, Investments [Table Text Block]

	March 31, 2023
	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U.S. Treasuries	$	-	$	-	$	947	$	46
U.S. Government agencies and corporations		50,869		2,032		283,074		46,616
States and political subdivisions		9,432		1,214		139,371		30,041
Mortgage-backed securities		18,576		242		141,868		7,269
Corporate debt securities		873		127		4,868		634
Total available for sale securities	$	79,750	$	3,615	$	570,128	$	84,606

	December 31, 2022
	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U.S. Treasuries	$	936	$	56	$	-	$	-
U.S. Government agencies and corporations		144,574		12,699		190,950		42,303
States and political subdivisions		94,657		18,373		52,134		19,645
Mortgage-backed securities		144,198		7,326		15,165		1,913
Corporate debt securities		4,843		655		821		182
Total temporarily impaired securities	$	389,208	$	39,109	$	259,070	$	64,043