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Securities (Tables)
 6 Months Ended
Jun. 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 June 30, 2024 and December 31, 2023:
Available-for-Sale Debt Securities
June 30, 2024Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
U.S. Treasuries$114,808 $60 $4,982 $109,886 
Obligations of U.S. Government sponsored entities442,952 2,937 23,212 422,677 
Obligations of U.S. states and political subdivisions88,563 1 10,088 78,476 
Mortgage-backed securities – residential, issued by
 U.S. Government agencies45,419 4 5,311 40,112 
 U.S. Government sponsored entities769,723 1,108 106,891 663,940 
U.S. corporate debt securities2,500 0 133 2,367 
Total available-for-sale debt securities$1,463,965 $4,110 $150,617 $1,317,458 
 
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 June 30, 2024 and December 31, 2023:
Held-to-Maturity Debt Securities
June 30, 2024Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
U.S. Treasuries$86,157 $0 $12,181 $73,976 
Obligations of U.S. Government sponsored entities226,273 0 35,661 190,612 
Total held-to-maturity debt securities$312,430 $0 $47,842 $264,588 
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 June 30, 2024 and December 31, 2023:

June 30, 2024Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasuries$0 $0 $73,976 $12,181 $73,976 $12,181 
Obligations of U.S. Government sponsored entities0 0 190,612 35,661 190,612 35,661 
Total held-to-maturity debt securities$0 $0 $264,588 $47,842 $264,588 $47,842 

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 June 30, 2024, and December 31, 2023:

June 30, 2024Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasuries$19,876 $2 $65,756 $4,980 $85,632 $4,982 
Obligations of U.S. Government sponsored entities29,993 14 214,490 23,198 244,483 23,212 
Obligations of U.S. states and political subdivisions2,236 8 76,125 10,080 78,361 10,088 
Mortgage-backed securities – residential, issued by
U.S. Government agencies0 0 39,801 5,311 39,801 5,311 
U.S. Government sponsored entities14,318 257 559,593 106,634 573,911 106,891 
U.S. corporate debt securities0 0 2,367 133 2,367 133 
Total available-for-sale debt securities$66,423 $281 $958,132 $150,336 $1,024,555 $150,617 
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
June 30, 2024
(In thousands)Amortized CostFair Value
Available-for-sale debt securities:
Due in one year or less$145,289 $143,154 
Due after one year through five years246,804 234,188 
Due after five years through ten years234,401 218,769 
Due after ten years22,329 17,295 
Total648,823 613,406 
Mortgage-backed securities815,142 704,052 
Total available-for-sale debt securities$1,463,965 $1,317,458 

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 
June 30, 2024
(In thousands)Amortized CostFair Value
Held-to-maturity debt securities:
Due after five years through ten years$312,430 $264,588 
Total held-to-maturity debt securities$312,430 $264,588 

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