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Securities (Tables)
 9 Months Ended
Sep. 30, 2023
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, 2023 and December 31, 2022:
Available-for-Sale Debt Securities
September 30, 2023Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
U.S. Treasuries$114,220 $0 $6,926 $107,294 
Obligations of U.S. Government sponsored entities491,968 10 32,037 459,941 
Obligations of U.S. states and political subdivisions90,154 2 12,919 77,237 
Mortgage-backed securities – residential, issued by
 U.S. Government agencies52,263 0 6,864 45,399 
 U.S. Government sponsored entities831,970 0 135,661 696,309 
U.S. corporate debt securities2,500 0 170 2,330 
Total available-for-sale debt securities$1,583,075 $12 $194,577 $1,388,510 
 
Available-for-Sale Debt Securities
December 31, 2022Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
U.S. Treasuries$190,170 $0 $22,919 $167,251 
Obligations of U.S. Government sponsored entities681,192 0 80,025 601,167 
Obligations of U.S. states and political subdivisions93,599 8 8,326 85,281 
Mortgage-backed securities – residential, issued by
U.S. Government agencies58,727 12 6,071 52,668 
U.S. Government sponsored entities805,603 0 119,381 686,222 
U.S. corporate debt securities2,500 0 122 2,378 
Total available-for-sale debt securities$1,831,791 $20 $236,844 $1,594,967 
Schedule of held-to-maturity securities
The following tables summarize held-to-maturity debt securities held by the Company at September 30, 2023 and December 31, 2022:
Held-to-Maturity Securities
September 30, 2023Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
U.S. Treasuries$86,318 $0 $14,767 $71,551 
Obligations of U.S. Government sponsored entities226,067 0 44,640 181,427 
Total held-to-maturity debt securities$312,385 $0 $59,407 $252,978 
Held-to-Maturity Securities
December 31, 2022Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
(In thousands)
U.S. Treasuries$86,478 $0 $12,937 $73,541 
Obligations of U.S. Government sponsored entities225,866 0 37,715 188,151 
Total held-to-maturity debt securities$312,344 $0 $50,652 $261,692 
The following table summarizes held-to-maturity debt securities that had unrealized losses at September 30, 2023 and December 31, 2022:

September 30, 2023Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasuries$0 $0 $71,551 $14,767 $71,551 $14,767 
Obligations of U.S. Government sponsored entities0 0 181,427 44,640 181,427 44,640 
Total held-to-maturity debt securities$0 $0 $252,978 $59,407 $252,978 $59,407 

December 31, 2022Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasuries$0 $0 $73,542 $12,937 $73,542 $12,937 
Obligations of U.S. Government sponsored entities24,543 3,903 163,607 33,812 188,150 37,715 
Total held-to-maturity debt securities$24,543 $3,903 $237,149 $46,749 $261,692 $50,652 
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, 2023, and December 31, 2022:

September 30, 2023Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasuries$43,560 $23 $63,734 $6,903 $107,294 $6,926 
Obligations of U.S. Government sponsored entities197,508 1,492 232,541 30,545 430,049 32,037 
Obligations of U.S. states and political subdivisions11,449 592 65,436 12,327 76,885 12,919 
Mortgage-backed securities – residential, issued by
U.S. Government agencies1,436 48 43,963 6,816 45,399 6,864 
U.S. Government sponsored entities97,751 1,671 598,559 133,990 696,310 135,661 
U.S. corporate debt securities0 0 2,330 170 2,330 170 
Total available-for-sale debt securities$351,704 $3,826 $1,006,563 $190,751 $1,358,267 $194,577 
December 31, 2022Less than 12 Months12 Months or LongerTotal
(In thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasuries$28,602 $2,132 $138,649 $20,787 $167,251 $22,919 
Obligations of U.S. Government sponsored entities143,794 7,508 457,373 72,517 601,167 80,025 
Obligations of U.S. states and political subdivisions46,638 2,385 33,435 5,941 80,073 8,326 
Mortgage-backed securities – residential, issued by
U.S. Government agencies22,9451,25829,3564,81352,3016,071
U.S. Government sponsored entities186,69016,869499,532102,512686,222119,381
U.S. corporate debt securities0 0 2,378 122 2,378 122 
Total available-for-sale debt securities$428,669 $30,152 $1,160,723 $206,692 $1,589,392 $236,844 
Schedule of amortized cost and estimated fair value of debt securities by contractual maturity
September 30, 2023
(In thousands)Amortized CostFair Value
Available-for-sale debt securities:
Due in one year or less$79,189 $78,511 
Due after one year through five years334,059 316,627 
Due after five years through ten years234,283 208,592 
Due after ten years51,311 43,072 
Total698,842 646,802 
Mortgage-backed securities884,233 741,708 
Total available-for-sale debt securities$1,583,075 $1,388,510 

December 31, 2022
(In thousands)Amortized CostFair Value
Available-for-sale debt securities:
Due in one year or less$50,922 $50,269 
Due after one year through five years508,880 459,721 
Due after five years through ten years367,743 314,408 
Due after ten years39,916 31,679 
Total967,461 856,077 
Mortgage-backed securities864,330 738,890 
Total available-for-sale debt securities$1,831,791 $1,594,967 
September 30, 2023
(In thousands)Amortized CostFair Value
Held-to-maturity debt securities:
Due after five years through ten years$312,385 $252,978 
Total held-to-maturity debt securities$312,385 $252,978 

December 31, 2022
(In thousands)Amortized CostFair Value
Held-to-maturity debt securities:
Due after five years through ten years$312,344 $261,692 
Total held-to-maturity debt securities$312,344 $261,692