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INVESTMENTS (Tables)
 9 Months Ended
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities The following table summarizes the amortized cost, estimated fair value, and unrealized gains (losses) of AFS debt securities, as of the dates indicated:
(In thousands)Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Fair
Value
September 30, 2024    
Obligations of states and political subdivisions$5,424 $1 $(50)$5,375 
MBS issued or guaranteed by U.S. government-sponsored enterprises
497,174 1,011 (54,476)443,709 
CMO issued or guaranteed by U.S. government-sponsored enterprises
140,490 917 (7,523)133,884 
Corporate bonds21,680 8 (1,445)20,243 
Total AFS debt securities$664,768 $1,937 $(63,494)$603,211 
December 31, 2023    
Obligations of states and political subdivisions$6,429 $1 $(44)$6,386 
MBS issued or guaranteed by U.S. government-sponsored enterprises525,439 630 (65,978)460,091 
CMO issued or guaranteed by U.S. government-sponsored enterprises149,387 1,161 (9,537)141,011 
Corporate bonds21,682 1 (3,363)18,320 
Total AFS debt securities$702,937 $1,793 $(78,922)$625,808 
The following table summarizes the Company's investment in FHLBB stock and FRB stock as presented within other investments on the consolidated statements of condition, as of the dates indicated:
(In thousands)September 30,
2024		December 31,
2023
FHLBB$17,140 $10,020 
FRB5,373 5,374 
Total other investments$22,513 $15,394 
Debt Securities, Available-for-Sale
Unrealized Gross Losses and Estimated Fair Values of Investment Securities by Length of Time that Individual Securities in Each Category in Continuous Loss Position
The following table presents the Company's AFS debt securities with gross unrealized losses, for which an ACL has not been recorded, segregated by the length of time the securities have been in a continuous loss position, as of the dates indicated:
 Less Than 12 Months12 Months or MoreTotal
(In thousands, except number of holdings)
Number of
Holdings		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
September 30, 2024     
Obligations of states and political subdivisions7 $893 $(7)$2,781 $(43)$3,674 $(50)
MBS issued or guaranteed by U.S. government-sponsored enterprises139 12,094 (19)379,019 (54,457)391,113 (54,476)
CMO issued or guaranteed by U.S. government-sponsored enterprises43 15,489 (90)59,171 (7,433)74,660 (7,523)
Corporate bonds11 — — 19,234 (1,445)19,234 (1,445)
Total AFS debt securities200 $28,476 $(116)$460,205 $(63,378)$488,681 $(63,494)
December 31, 2023      
Obligations of states and political subdivisions6 $2,345 $(6)$1,437 $(38)$3,782 $(44)
MBS issued or guaranteed by U.S. government-sponsored enterprises145 13,474 (23)407,200 (65,955)420,674 (65,978)
CMO issued or guaranteed by U.S. government-sponsored enterprises43 19,620 (45)62,869 (9,492)82,489 (9,537)
Corporate bonds11 — — 17,319 (3,363)17,319 (3,363)
Total AFS debt securities205 $35,439 $(74)$488,825 $(78,848)$524,264 $(78,922)
Contractual Obligation, Fiscal Year Maturity
The amortized cost and estimated fair values of the Company's AFS debt securities by contractual maturity as of September 30, 2024, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Mortgage-related securities are shown in total, as their maturities are highly variable.
(In thousands)Amortized
Cost		Fair
Value
Due in one year or less$— $— 
Due after one year through five years10,944 10,439 
Due after five years through ten years16,160 15,179 
Due after ten years— — 
Subtotal27,104 25,618 
Mortgage-related securities637,664 577,593 
Total$664,768 $603,211 
Debt Securities, Held-to-maturity The following table summarizes the amortized cost, estimated fair value and unrealized gains (losses) of HTM debt securities as of the dates indicated:
(In thousands)
Amortized
Cost(1)
Unrealized
Gains		Unrealized
Losses		Fair
Value
September 30, 2024
Obligations of U.S. government-sponsored enterprises$7,695 $— $(329)$7,366 
Obligations of states and political subdivisions56,476 673 (531)56,618 
MBS issued or guaranteed by U.S. government-sponsored enterprises295,229 — (16,269)278,960 
CMO issued or guaranteed by U.S. government-sponsored enterprises147,551 393 (9,731)138,213 
Corporate bonds19,300 933 (771)19,462 
Total HTM debt securities $526,251 $1,999 $(27,631)$500,619 
December 31, 2023
Obligations of U.S. government-sponsored enterprises$7,593 $— $(528)$7,065 
Obligations of states and political subdivisions56,262 1,242 (731)56,773 
MBS issued or guaranteed by U.S. government-sponsored enterprises304,850 — (21,623)283,227 
CMO issued or guaranteed by U.S. government-sponsored enterprises157,118 515 (13,497)144,136 
Corporate bonds19,108 1,377 (1,091)19,394 
Total HTM debt securities$544,931 $3,134 $(37,470)$510,595 
(1)Amortized cost presented above includes unamortized unrealized losses from the aforementioned transfer from AFS to HTM securities that occurred in 2022. As of September 30, 2024 and December 31, 2023, the unamortized unrealized losses on the 2022 transfer included within amortized cost were as follows: (1) $890,000 and $992,000 in obligations of U.S. government-sponsored enterprises, (2) $5.3 million and $5.6 million in obligations of state and political subdivisions, (3) $31.7 million and $34.6 million in MBS, (4) $16.9 million and $18.4 million in CMO, and (5) $62,000 and $85,000 in corporate bonds, respectively.
Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity
Three Months Ended
September 30,
Nine Months Ended
September 30,
(In thousands)2024202320242023
Beginning balance
$— $— $— $— 
HTM debt securities recovered (charged-off)
— — 910 (1,838)
(Credit) provision on HTM debt securities
— — (910)1,838 
Ending balance
$— $— $— $— 
The amortized cost and estimated fair values of HTM debt securities by contractual maturity as of September 30, 2024 are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Mortgage-related securities are shown in total, as their maturities are highly variable.
(In thousands)Amortized
Cost		Fair
Value
Due in one year or less$501 $499 
Due after one year through five years1,790 1,807 
Due after five years through ten years40,246 40,085 
Due after ten years40,934 41,055 
Subtotal83,471 83,446 
Mortgage-related securities442,780 417,173 
Total$526,251 $500,619