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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2024
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, 2024
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
State and political subdivisions $188,933 $4 $(16,973)$171,964 
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises267,359 11 (34,095)233,275 
Corporate bonds95,841 3 (8,058)87,786 
Asset backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises35,575 — (579)34,996 
Total $587,708 $18 $(59,705)$528,021 
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 enterprises188,307 — (30,508)157,799 
Corporate bonds111,109 — (8,769)102,340 
Treasury Securities109,836 — (1,115)108,721 
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises40,368 — (1,146)39,222 
Total $684,917 $4 $(57,804)$627,117 
Unrealized Gain (Loss) on Investments The fair values of securities with unrealized losses are as follows:
December 31, 2024
Less than 12 months12 months or moreTotal
(In thousands)Estimated
Fair Value		 Unrealized
Losses		 Estimated
Fair Value		Unrealized
Losses		 Estimated
Fair Value		 Unrealized
Losses
State and political subdivisions $4,082 $8 $163,893 $16,964 $167,975 $16,972 
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises85,272 2,086 139,676 32,009 224,948 34,095 
Corporate bonds7,901 99 66,860 7,960 74,761 8,059 
Asset backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises— — 30,575 579 30,575 579 
Total $97,255 $2,193 $401,004 $57,512 $498,259 $59,705 
December 31, 2023
Less than 12 months12 months or moreTotal
(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 bonds19,545 455 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 
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, 2024
(In thousands)Amortized CostFair Value
Due in 1 year or less
$8,826 $8,820 
Due after 1 year through 5 years
104,272 102,227 
Due after 5 years through 10 years
207,253 183,452 
Due after 10 years
267,357 233,522 
Total $587,708 $528,021