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Investment in Securities (Tables)
 9 Months Ended
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investment Securities The amortized cost, gross unrealized gains, gross unrealized losses and fair value of investment securities are summarized as follows:
September 30, 2023
(In thousands)Amortized
Cost		 Gross
Unrealized
Gains		 Gross
Unrealized
Losses		 Fair
Value
State and political subdivisions $241,194 $2 $25,735 $215,461 
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises192,241 — 39,806 152,435 
Corporate bonds 111,172 — 11,723 99,449 
Treasury securities109,752 — 2,030 107,722 
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises42,020 — 1,232 40,788 
Total $696,379 $2 $80,526 $615,855 
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 enterprises205,175 — 31,236 173,939 
Corporate bonds96,348 — 11,251 85,097 
Treasury securities158,935 — 3,652 155,283 
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises47,213 — 2,190 45,023 
Total $825,047 $54 $70,633 $754,468 
Schedule of Unrealized Loss on Investments
The fair values of securities with unrealized losses are as follows:
September 30, 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 $63,256 $1,183 $149,202 $24,552 $212,458 $25,735 
Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises— — 152,435 39,806 152,435 39,806 
Corporate bonds14,939 61 79,510 11,662 94,449 11,723 
Treasury securities— — 107,722 2,030 107,722 2,030 
Asset backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises— — 40,788 1,232 40,788 1,232 
Total $78,195 $1,244 $529,657 $79,282 $607,852 $80,526 
December 31, 2022
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 $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 enterprises53,732 6,135 118,017 25,101 171,749 31,236 
Corporate bonds32,517 3,629 47,580 7,622 80,097 11,251 
Treasury securities155,283 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 investment 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.
September 30, 2023
(In thousands)Amortized CostFair Value
Due in 1 year or less
$124,354 $122,207 
Due after 1 year through 5 years
141,867 138,528 
Due after 5 years through 10 years
201,815 169,520 
Due after 10 years
228,343 185,600 
Total $696,379 $615,855