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Investments (Tables)
 12 Months Ended
Dec. 31, 2023
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
December 31, 2023        
Obligations of states and political subdivisions$6,429 $1 $(44)$6,386 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises525,439 630 (65,978)460,091 
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises149,387 1,161 (9,537)141,011 
Subordinated corporate bonds21,682 1 (3,363)18,320 
Total AFS debt securities$702,937 $1,793 $(78,922)$625,808 
December 31, 2022        
Obligations of states and political subdivisions$49,678 $11 $(463)$49,226 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises598,845 131 (84,957)514,019 
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises122,760 — (13,413)109,347 
Subordinated corporate bonds
25,677 3 (2,397)23,283 
Total AFS debt securities$796,960 $145 $(101,230)$695,875 
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)
December 31, 2023
December 31, 2022
FHLBB$10,020 $7,339 
FRB5,374 5,374 
Total$15,394 $12,713 
Company's Sales of Securities
The following table details the Company’s sales of AFS debt securities for the periods indicated below:
For the Year Ended
December 31,
(In thousands)202320222021
Proceeds from sales
$126,766 $36,280 $— 
Gross realized gains— 13 — 
Gross realized losses(10,310)(925)— 
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 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 HoldingsFair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
December 31, 2023            
Obligations of states and political subdivisions6 $2,345 $(6)$1,437 $(38)$3,782 $(44)
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises145 13,474 (23)407,200 (65,955)420,674 (65,978)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises43 19,620 (45)62,869 (9,492)82,489 (9,537)
Subordinated 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)
December 31, 2022            
Obligations of states and political subdivisions83 $42,276 $(463)$— $— $42,276 $(463)
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises175 118,290 (11,521)381,355 (73,436)499,645 (84,957)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises64 47,340 (4,589)62,007 (8,824)109,347 (13,413)
Subordinated corporate bonds
13 7,687 (384)14,593 (2,013)22,280 (2,397)
Total AFS debt securities335 $215,593 $(16,957)$457,955 $(84,273)$673,548 $(101,230)
Contractual Obligation, Fiscal Year Maturity 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$1,000 $1,000 
Due after one year through five years10,835 9,997 
Due after five years through ten years16,276 13,709 
Due after ten years— — 
     Subtotal28,111 24,706 
Mortgage-related securities674,826 601,102 
     Total$702,937 $625,808 
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
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 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises304,850 — (21,623)283,227 
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises157,118 515 (13,497)144,136 
Subordinated corporate bonds19,108 1,377 (1,091)19,394 
Total HTM debt securities$544,931 $3,134 $(37,470)$510,595 
December 31, 2022
Obligations of U.S. government-sponsored enterprises$7,457 $— $(777)$6,680 
Obligations of states and political subdivisions55,978 431 (1,610)54,799 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises317,406 — (24,766)292,640 
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises145,069 — (13,724)131,345 
Subordinated corporate bonds20,673 332 (276)20,729 
Total HTM debt securities$546,583 $763 $(41,153)$506,193 
(1)    Amortized cost presented above includes unamortized unrealized losses from the aforementioned transfer from AFS to HTM securities as of December 31, 2023 and 2022 as follows: (1) $992,000 and $1.1 million, respectively, in obligations of U.S. government-sponsored enterprises; (2) $5.6 million and $6.1 million, respectively, in obligations of state and political subdivisions; (3) $34.6 million and $38.4 million, respectively, in mortgage-backed securities; (4) $18.4 million and $20.7 million, respectively, in collateralized mortgage obligations; and (5) $85,000 and $117,000, respectively in subordinated corporate bonds.
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, as reported under CECL, for the periods indicated:
December 31,
(In thousands)20232022
Beginning balance
$— $— 
HTM debt securities charged-off
(1,838)— 
Provision for HTM debt securities
1,838 — 
Ending balance
$— $— 
The amortized cost and estimated fair values of HTM debt securities by contractual maturity are shown in the table below as of December 31, 2023. 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 1,818 
Due after five years through ten years35,975 35,840 
Due after ten years44,696 45,076 
Subtotal82,963 83,232 
Mortgage-related securities461,968 427,363 
Total$544,931 $510,595