Note 3 - Securities (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

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

	September 30, 2023
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Allowance for Credit Losses		Fair Value
Available for Sale:
U.S. Treasuries	$	995	$	-	$	47	$	-	$	948
U.S. Government agencies and corporations		353,845		-		57,856		-		295,989
States and political subdivisions		179,672		-		42,603		-		137,069
Mortgage-backed securities		161,067		-		8,955		-		152,112
Corporate debt securities		6,504		-		1,070		-		5,434
Total securities available for sale	$	702,083	$	-	$	110,531	$	-	$	591,552

	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]

	September 30, 2023
	Amortized Cost		Fair Value
Available for Sale:
Due in one year or less	$	1,755	$	1,730
Due after one year through five years		154,209		140,650
Due after five years through ten years		293,046		239,668
Due after ten years		253,073		209,504
Total securities available for sale	$	702,083	$	591,552

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

	September 30, 2023
	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U.S. Treasuries	$	-	$	-	$	948	$	47
U.S. Government agencies and corporations		-		-		295,989		57,856
States and political subdivisions		845		41		135,979		42,562
Mortgage-backed securities		1,664		39		150,448		8,916
Corporate debt securities		-		-		5,434		1,070
Total temporarily impaired securities	$	2,509	$	80	$	588,798	$	110,451

	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