Debt Securities (Tables)

9 Months Ended

Sep. 30, 2024

Investments, Debt and Equity Securities [Abstract]

Summary of Debt Securities

Debt securities at September 30, 2024 and December 31, 2023 are summarized as follows:

	September 30, 2024
	Securities Available-For-Sale
	In Thousands
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Market Value
U.S. Treasury and other U.S. government    agencies	$	4,921		—		335		4,586
U.S. Government-sponsored enterprises    (GSEs)		174,265		41		17,677		156,629
Mortgage-backed securities		501,465		1,144		52,168		450,441
Asset-backed securities		49,143		124		431		48,836
Corporate bonds		2,500		—		104		2,396
Obligations of states and political    subdivisions		184,754		137		23,724		161,167
	$	917,048		1,446		94,439		824,055

	December 31, 2023
	Securities Available-For-Sale
	In Thousands
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Market Value
U.S. Treasury and other U.S. government    agencies	$	4,901		—		472		4,429
U.S. Government-sponsored enterprises    (GSEs)		167,738		—		23,570		144,168
Mortgage-backed securities		480,759		230		63,959		417,030
Asset-backed securities		51,183		193		1,403		49,973
Corporate bonds		2,500		—		77		2,423
Obligations of states and political    subdivisions		223,358		397		30,697		193,058
	$	930,439		820		120,178		811,081

Amortized Cost and Estimated Market Value of Debt Securities by Contractual Maturity

The amortized cost and estimated market value of debt securities at September 30, 2024 by contractual maturity are shown below.

	Available-For-Sale
	In Thousands
	Amortized Cost		Estimated Market Value
Due in one year or less	$	5,573	$	5,379
Due after one year through five years		126,026		115,570
Due after five years through ten years		243,432		218,636
Due after ten years		542,017		484,470
	$	917,048	$	824,055

Gross Unrealized Losses and Fair Value of Investments

The following tables show the gross unrealized losses and fair value of the Company’s investments with unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 2024 and December 31, 2023.

	In Thousands, Except Number of Securities
	Less than 12 Months						12 Months or More						Total
September 30, 2024	Fair Value		Unrealized Losses		Number of Securities Included		Fair Value		Unrealized Losses		Number of Securities Included		Fair Value		Unrealized Losses
Available-for-Sale Securities:
U.S. Treasury and other    U.S. government agencies	$	—	$	—		—	$	4,586	$	335		2	$	4,586	$	335
U.S. Government-sponsored    enterprises (GSEs)		—		—		—		151,986		17,677		67		151,986		17,677
Mortgage-backed securities		21,309		148		4		369,532		52,020		217		390,841		52,168
Asset-backed securities		11,915		22		4		19,713		409		11		31,628		431
Corporate bonds		—		—		—		2,396		104		1		2,396		104
Obligations of states and    political subdivisions		335		16		2		155,527		23,708		166		155,862		23,724
	$	33,559	$	186		10	$	703,740	$	94,253		464	$	737,299	$	94,439

	In Thousands, Except Number of Securities
	Less than 12 Months						12 Months or More						Total
December 31, 2023	Fair Value		Unrealized Losses		Number of Securities Included		Fair Value		Unrealized Losses		Number of Securities Included		Fair Value		Unrealized Losses
Available-for-Sale Securities:
U.S. Treasury and other    U.S. government agencies	$	—	$	—		—	$	4,429	$	472		2	$	4,429	$	472
U.S. Government-sponsored    enterprises (GSEs)		—		—		—		144,169		23,570		55		144,169		23,570
Mortgage-backed securities		8,889		63		7		390,557		63,896		221		399,446		63,959
Asset-backed securities		2,500		44		1		30,666		1,359		26		33,166		1,403
Corporate bonds		—		—		—		2,423		77		1		2,423		77
Obligations of states and    political subdivisions		5,375		14		2		171,157		30,683		193		176,532		30,697
	$	16,764	$	121		10	$	743,401	$	120,057		498	$	760,165	$	120,178