Note 3 - Securities (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

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

March 31, 2024	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. government agencies and corporations	$	352,961	$	-	$	44,972	$	307,989
States and political subdivisions		179,343		-		31,344		147,999
Mortgage-backed securities		153,572		6		6,255		147,323
Corporate debt securities		6,505		-		817		5,688
U.S. treasury		997		-		28		969
Total securities available for sale	$	693,378	$	6	$	83,416	$	609,968

December 31, 2023	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. government agencies and corporations	$	353,904	$	-	$	42,060	$	311,844
States and political subdivisions		179,507		-		29,614		149,893
Mortgage-backed securities		156,875		-		6,724		150,151
Corporate debt securities		6,504		-		754		5,750
U.S. treasury		996		-		33		963
Total securities available for sale	$	697,786	$	-	$	79,185	$	618,601

Investments Classified by Contractual Maturity Date [Table Text Block]

	March 31, 2024
	Amortized Cost		Fair Value
Available for Sale:
Due in one year or less	$	13,749	$	13,419
Due after one year through five years		180,902		166,926
Due after five years through ten years		273,587		232,336
Due after ten years		225,140		197,287
Total securities available for sale	$	693,378	$	609,968

Gain (Loss) on Securities [Table Text Block]

March 31, 2024	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U.S. government agencies and corporations	$	-	$	-	$	307,989	$	44,972
State and political subdivisions		1,507		126		146,492		31,218
Mortgage-backed securities		583		1		135,492		6,254
Corporate debt securities		-		-		5,688		817
U.S. treasury		-		-		969		28
Total temporarily impaired securities	$	2,090	$	127	$	596,630	$	83,289

December 31, 2023	Less Than 12 Months				12 Months or More
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
U.S. government agencies and corporations	$	-	$	-	$	311,844	$	42,060
State and political subdivisions		884		1		148,763		29,613
Mortgage-backed securities		1,616		26		147,922		6,698
Corporate debt securities		-		-		5,750		754
U.S. treasury		-		-		963		33
Total temporarily impaired securities	$	2,500	$	27	$	615,242	$	79,158