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Securities (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2024 and December 31, 2023:
Available-for-Sale Debt Securities
September 30, 2024Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
U.S. Treasuries$85,036 $380 $3,305 $82,111 
Obligations of U.S. Government sponsored entities408,292 8,241 16,328 400,205 
Obligations of U.S. states and political subdivisions86,583 14 7,079 79,518 
Mortgage-backed securities – residential, issued by
 U.S. Government agencies70,886 12 3,798 67,100 
 U.S. Government sponsored entities757,108 3,720 82,875 677,953 
U.S. corporate debt securities2,500 0 108 2,392 
Total available-for-sale debt securities$1,410,405 $12,367 $113,493 $1,309,279 
 
Available-for-Sale Debt Securities
December 31, 2023Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
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 September 30, 2024 and December 31, 2023:
Held-to-Maturity Debt Securities
September 30, 2024Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
U.S. Treasuries$86,103 $0 $8,956 $77,147 
Obligations of U.S. Government sponsored entities226,343 0 26,891 199,452 
Total held-to-maturity debt securities$312,446 $0 $35,847 $276,599 
Held-to-Maturity Debt Securities
December 31, 2023Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
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 September 30, 2024 and December 31, 2023:

September 30, 2024Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasuries$0 $0 $77,147 $8,956 $77,147 $8,956 
Obligations of U.S. Government sponsored entities0 0 199,452 26,891 199,452 26,891 
Total held-to-maturity debt securities$0 $0 $276,599 $35,847 $276,599 $35,847 

December 31, 2023Less 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 
Schedule of available-for-sale securities with unrealized losses
The following table summarizes available-for-sale debt securities that had unrealized losses at September 30, 2024, and December 31, 2023:

September 30, 2024Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasuries$0 $0 $67,465 $3,305 $67,465 $3,305 
Obligations of U.S. Government sponsored entities0 0 201,802 16,328 201,802 16,328 
Obligations of U.S. states and political subdivisions0 0 75,370 7,079 75,370 7,079 
Mortgage-backed securities – residential, issued by
U.S. Government agencies27,779 63 39,010 3,735 66,789 3,798 
U.S. Government sponsored entities5,562 31 560,180 82,844 565,742 82,875 
U.S. corporate debt securities0 0 2,392 108 2,392 108 
Total available-for-sale debt securities$33,341 $94 $946,219 $113,399 $979,560 $113,493 
December 31, 2023Less 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 agencies1,145443,7644,74044,9094,744
U.S. Government sponsored entities5,65966609,456100,829615,115100,895
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
September 30, 2024
(In thousands)Amortized CostFair Value
Available-for-sale debt securities:
Due in one year or less$109,842 $108,632 
Due after one year through five years226,448 219,556 
Due after five years through ten years223,794 217,790 
Due after ten years22,327 18,248 
Total582,411 564,226 
Mortgage-backed securities827,994 745,053 
Total available-for-sale debt securities$1,410,405 $1,309,279 

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 
September 30, 2024
(In thousands)Amortized CostFair Value
Held-to-maturity debt securities:
Due after one year through five years$76,717 $68,743 
Due after five years through ten years235,729 207,856 
Total held-to-maturity debt securities$312,446 $276,599 

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