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Securities (Tables)
 12 Months Ended
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-Sale Securities
The following tables summarize available-for-sale debt securities held by the Company at December 31, 2024 and 2023:
December 31, 2024Available-for-Sale Debt Securities
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
U.S. Treasuries$75,141 $140 $3,784 $71,497 
Obligations of U.S. Government sponsored entities398,648 2,008 20,376 380,280 
Obligations of U.S. states and political subdivisions86,328 4 8,638 77,694 
Mortgage-backed securities – residential, issued by
 U.S. Government agencies68,130 3 4,879 63,254 
 U.S. Government sponsored entities736,376 1,680 101,696 636,360 
U.S. corporate debt securities2,500 0 53 2,447 
Total available-for-sale debt securities$1,367,123 $3,835 $139,426 $1,231,532 

December 31, 2023Available-for-Sale Debt Securities
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
U.S. Treasuries$114,418 $495 $5,009 $109,904 
Obligations of U.S. Government sponsored entities472,286 6,449 22,277 456,458 
Obligations of U.S. states and political subdivisions89,999 2 8,077 81,924 
Mortgage-backed securities – residential, issued by
U.S. Government agencies49,976 8 4,744 45,240 
U.S. Government sponsored entities819,303 2,422 100,895 720,830 
U.S. corporate debt securities2,500 0 206 2,294 
Total available-for-sale debt securities$1,548,482 $9,376 $141,208 $1,416,650 
Schedule of Held to Maturity Securities
The following tables summarize held-to-maturity debt securities held by the Company at December 31, 2024 and 2023:

December 31, 2024Held-to-Maturity Debt Securities
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
U.S. Treasuries$86,049 $0 $11,361 $74,688 
Obligations of U.S. Government sponsored entities226,413 $0 33,806 192,607 
Total held-to-maturity debt securities$312,462 $0 $45,167 $267,295 
 
December 31, 2023Held-to-Maturity Debt Securities
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
U.S. Treasuries$86,266 $0 $11,051 $75,215 
Obligations of U.S. Government sponsored entities226,135 0 33,895 192,240 
Total held-to-maturity debt securities$312,401 $0 $44,946 $267,455 
The following table summarizes held-to-maturity debt securities that had unrealized losses at December 31, 2024:

December 31, 2024Held-to-Maturity Debt Securities
Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasuries$0 $0 $74,688 $11,361 $74,688 $11,361 
Obligations of U.S. Government sponsored entities0 0 192,607 33,806 192,607 33,806 
Total held-to-maturity debt securities$0 $0 $267,295 $45,167 $267,295 $45,167 
The following table summarizes held-to-maturity debt securities that had unrealized losses at December 31, 2023:

December 31, 2023Held-to-Maturity Debt Securities
Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasuries$0 $0 $75,215 $11,051 $75,215 $11,051 
Obligations of U.S. Government sponsored entities0 0 192,240 33,895 192,240 33,895 
Total held-to-maturity debt securities$0 $0 $267,455 $44,946 $267,455 $44,946 
December 31, 2024
(In thousands)Amortized CostFair Value
Held-to-maturity debt securities:
Due after one year through five years$117,283 $102,173 
Due after five years through ten years195,179 165,122 
Total held-to-maturity debt securities$312,462 $267,295 
December 31, 2023
(In thousands)Amortized CostFair Value
Held-to-maturity debt securities:
Due after five years through ten years$312,401 $267,455 
Total held-to-maturity debt securities$312,401 $267,455 
Schedule of Sales Transactions of Available-for-Sale Securities
The following table sets forth information with regard to sales transactions of available-for-sale debt securities:

Year ended December 31,
(In thousands)202420232022
Proceeds from sales$39,952 $440,488 $160,638 
Gross realized gains50 0 0 
Gross realized losses0 (69,983)(11,916)
Net gain (loss) on sales of available-for-sale debt securities$50 $(69,983)$(11,916)
Schedule of Debt Securities, Available for Sale with Unrealized Losses
The following table summarizes available-for-sale debt securities that had unrealized losses at December 31, 2024:

December 31, 2024Available-for-Sale Debt Securities
Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasuries$0 $0 $57,019 $3,784 $57,019 $3,784 
Obligations of U.S. Government sponsored entities14,085 515 188,296 19,861 202,381 20,376 
Obligations of U.S. states and political subdivisions3,159 36 73,657 8,602 76,816 8,638 
Mortgage-backed securities – residential, issued by
U.S. Government agencies27,082 89 35,879 4,790 62,961 4,879 
U.S. Government sponsored entities32,063 502 523,353 101,194 555,416 101,696 
U.S. corporate debt securities0 0 2,447 53 2,447 53 
Total available-for-sale debt securities$76,389 $1,142 $880,651 $138,284 $957,040 $139,426 
The following table summarizes available-for-sale debt securities that had unrealized losses at December 31, 2023: 

December 31, 2023Available-for-Sale Debt Securities
Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasuries$0 $0 $65,663 $5,009 $65,663 $5,009 
Obligations of U.S. Government sponsored entities14,453 110 220,913 22,167 235,366 22,277 
Obligations of U.S. states and political subdivisions10,572 106 69,601 7,971 80,173 8,077 
Mortgage-backed securities – residential, issued by
U.S. Government agencies1,145 4 43,764 4,740 44,909 4,744 
U.S. Government sponsored entities5,659 66 609,456 100,829 615,115 100,895 
U.S. corporate debt securities0 0 2,294 206 2,294 206 
Total available-for-sale debt securities$31,829 $286 $1,011,691 $140,922 $1,043,520 $141,208 
Schedule of amortized cost and estimated fair value of debt securities by contractual maturity
The amortized cost and estimated fair value of debt securities by contractual maturity are shown in the following table. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Mortgage-backed securities are shown separately since they are not due at a single maturity date. 
December 31, 2024
(In thousands)Amortized CostFair Value
Available-for-sale debt securities:
Due in one year or less$100,000 $99,153 
Due after one year through five years227,502 215,976 
Due after five years through ten years212,789 199,457 
Due after ten years22,326 17,332 
Total562,617 531,918 
Mortgage-backed securities804,506 699,614 
Total available-for-sale debt securities$1,367,123 $1,231,532 
December 31, 2023
(In thousands)Amortized CostFair Value
Available-for-sale debt securities:
Due in one year or less$99,242 $98,650 
Due after one year through five years307,093 296,279 
Due after five years through ten years245,617 233,569 
Due after ten years27,251 22,082 
Total679,203 650,580 
Mortgage-backed securities869,279 766,070 
Total available-for-sale debt securities$1,548,482 $1,416,650