Investment Securities (Tables)

12 Months Ended

Dec. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Schedule of Investment Securities

The table below presents the balances of securities available-for-sale

measured at fair value on a recurring basis. The amortized cost, gross unrealized gains, gross unrealized losses and fair value of debt and equity securities are summarized as follows:

	December 31, 2023
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
State and political subdivisions	$	235,297	$	4	$	(16,266)	$	219,035
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises	188,307		—		(30,508)		157,799
Corporate bonds	111,109		—		(8,769)		102,340
Treasury securities	109,836		—		(1,115)		108,721
Asset backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	40,368		—		(1,146)		39,222
Total	$	684,917	$	4	$	(57,804)	$	627,117

	December 31, 2022
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
State and political subdivisions	$	317,376	$	54	$	(22,304)	$	295,126
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises	205,175		—		(31,236)		173,939
Corporate bonds	96,348		—		(11,251)		85,097
Treasury Securities	158,935		—		(3,652)		155,283
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises	47,213		—		(2,190)		45,023
Total	$	825,047	$	54	$	(70,633)	$	754,468

Unrealized Gain (Loss) on Investments

The fair values of securities with unrealized losses are as follows:

	December 31, 2023
	Less than 12 months				12 months or more				Total
(In thousands)	Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses
State and political subdivisions	$	63,198	$	220	$	152,854	$	16,046	$	216,052	$	16,266
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises	—		—		157,799		30,508		157,799		30,508
Corporate bonds	19,545		455		82,795		8,314		102,340		8,769
Treasury securities	—		—		108,721		1,115		108,721		1,115
Asset backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	—		—		39,222		1,146		39,222		1,146
Total	$	82,743	$	675	$	541,391	$	57,129	$	624,134	$	57,804

	December 31, 2022
	Less than 12 months				12 months or more				Total
(In thousands)	Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses
State and political subdivisions	$	214,919	$	8,958	$	47,474	$	13,346	$	262,393	$	22,304
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises	53,732		6,135		118,017		25,101		171,749		31,236
Corporate bonds	32,517		3,629		47,580		7,622		80,097		11,251
Treasury securities	155,283		3,652		—		—		155,283		3,652
Asset backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises	—		—		47,213		2,190		47,213		2,190
Total	$	456,451	$	22,374	$	260,284	$	48,259	$	716,735	$	70,633

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The amortized cost and fair value of debt and equity securities by contractual maturity are shown in the following table. Expected maturities may differ from contractual maturities because borrowers have the right to prepay obligations with or without prepayment penalties.

	December 31, 2023
(In thousands)	Amortized Cost		Fair Value
Due in 1 year or less	$	130,388	$	129,213
Due after 1 year through 5 years	136,710		134,663
Due after 5 years through 10 years	202,069		178,754
Due after 10 years	215,750		184,487
Total	$	684,917	$	627,117