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INVESTMENTS (Tables)
 3 Months Ended
Mar. 31, 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
March 31, 2024    
Obligations of states and political subdivisions$5,426 $2 $(58)$5,370 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
514,054 333 (72,381)442,006 
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
144,102 490 (9,795)134,797 
Corporate bonds21,681 — (2,278)19,403 
Total AFS debt securities$685,263 $825 $(84,512)$601,576 
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)March 31,
2024		December 31,
2023
FHLBB$11,018 $10,020 
FRB5,374 5,374 
Total other investments$16,392 $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
March 31, 2024     
Obligations of states and political subdivisions7 $1,434 $(16)$2,233 $(42)$3,667 $(58)
MBS issued or guaranteed by U.S. government-sponsored enterprises144 27,229 (40)390,388 (72,341)417,617 (72,381)
CMO issued or guaranteed by U.S. government-sponsored enterprises41 9,581 (27)60,851 (9,768)70,432 (9,795)
Corporate bonds12 995 (5)18,408 (2,273)19,403 (2,278)
Total AFS debt securities204 $39,239 $(88)$471,880 $(84,424)$511,119 $(84,512)
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 $(78,922)
Contractual Obligation, Fiscal Year Maturity
The amortized cost and estimated fair values of the Company's AFS debt securities by contractual maturity at March 31, 2024, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Mortgage-related securities are shown in total, as their maturities are highly variable.
(In thousands)Amortized
Cost		Fair
Value
Due in one year or less$— $— 
Due after one year through five years10,833 9,993 
Due after five years through ten years16,274 14,780 
Due after ten years— — 
Subtotal27,107 24,773 
Mortgage-related securities658,156 576,803 
Total$685,263 $601,576 
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
March 31, 2024
Obligations of U.S. government-sponsored enterprises$7,627 $— $(641)$6,986 
Obligations of states and political subdivisions56,333 331 (884)55,780 
MBS issued or guaranteed by U.S. government-sponsored enterprises302,177 — (28,030)274,147 
CMO issued or guaranteed by U.S. government-sponsored enterprises155,040 249 (14,156)141,133 
Corporate bonds19,172 515 (1,216)18,471 
Total HTM debt securities $540,349 $1,095 $(44,927)$496,517 
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 as of March 31, 2024 and December 31, 2023, as follows: (1) $958,000 and $992,000 in obligations of U.S. government-sponsored enterprises, (2) $5.5 million and $5.6 million in obligations of state and political subdivisions, (3) $33.7 million and $34.6 million in MBS, (4) $17.9 million and $18.4 million in CMO, and (5) $78,000 and $85,000 in corporate bonds, respectively.
Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity
The following table presents the activity in the ACL on HTM debt securities for the periods indicated:
March 31,
(In thousands)20242023
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 at March 31, 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$502 $498 
Due after one year through five years1,790 1,798 
Due after five years through ten years37,471 36,110 
Due after ten years43,369 42,831 
Subtotal83,132 81,237 
Mortgage-related securities457,217 415,280 
Total$540,349 $496,517