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Investments (Tables)
 12 Months Ended
Dec. 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
December 31, 2024        
Obligations of states and political subdivisions$5,423 $— $(134)$5,289 
MBS issued or guaranteed by U.S. government-sponsored enterprises
493,766 353 (69,163)$424,956 
CMO issued or guaranteed by U.S. government-sponsored enterprises
156,131 502 (9,154)$147,479 
Subordinated corporate bonds17,683 — (1,658)$16,025 
Total AFS debt securities$673,003 $855 $(80,109)$593,749 
December 31, 2023        
Obligations of states and political subdivisions$6,429 $1 $(44)$6,386 
MBS issued or guaranteed by U.S. government-sponsored enterprises
525,439 630 (65,978)460,091 
CMO issued or guaranteed by U.S. government-sponsored enterprises
149,387 1,161 (9,537)141,011 
Subordinated corporate bonds
21,682 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)
December 31, 2024
December 31, 2023
FHLBB$17,140 $10,020 
FRB5,374 5,374 
Total other investments
$22,514 $15,394 
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)202420232022
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, 2024            
Obligations of states and political subdivisions11 $1,377 $(7)$3,597 $(127)$4,974 $(134)
MBS issued or guaranteed by U.S. government-sponsored enterprises
136 36,732 (260)352,823 (68,903)389,555 (69,163)
CMO issued or guaranteed by U.S. government-sponsored enterprises
47 36,146 (227)55,540 (8,927)91,686 (9,154)
Subordinated corporate bonds10 494 (6)15,531 (1,652)16,025 (1,658)
Total AFS debt securities204 $74,749 $(500)$427,491 $(79,609)$502,240 $(80,109)
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 enterprises
145 13,474 (23)407,200 (65,955)420,674 (65,978)
CMO issued or guaranteed by U.S. government-sponsored enterprises
43 19,620 (45)62,869 (9,492)82,489 (9,537)
Subordinated corporate bonds
11 — — 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 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$116 $116 
Due after one year through five years11,148 10,546 
Due after five years through ten years11,842 10,652 
Due after ten years— — 
     Subtotal23,106 21,314 
Mortgage-related securities649,897 572,435 
     Total$673,003 $593,749 
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, 2024
Obligations of U.S. government-sponsored enterprises$7,729 $— $(647)$7,082 
Obligations of states and political subdivisions56,047 96 (1,872)54,271 
MBS issued or guaranteed by U.S. government-sponsored enterprises
292,170 — (28,980)263,190 
CMO issued or guaranteed by U.S. government-sponsored enterprises
142,467 150 (15,747)126,870 
Subordinated corporate bonds19,365 476 (430)19,411 
Total HTM debt securities$517,778 $722 $(47,676)$470,824 
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 enterprises
304,850 — (21,623)283,227 
CMO issued or guaranteed by U.S. government-sponsored enterprises
157,118 515 (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 
(1)    Amortized cost presented above includes unamortized unrealized losses from the aforementioned transfer from AFS to HTM securities that occurred in 2022. As of December 31, 2024 and 2023, the unamortized unrealized losses on the 2022 transfer included within amortized cost were as follows: (1) $856,000 and $992,000 in obligations of U.S. government-sponsored enterprises; (2) $5.1 million and $5.6 million in obligations of state and political subdivisions; (3) $30.8 million and $34.6 million in MBS; (4) $16.4 million and $18.4 million, in CMO; and (5) $54,000 and $85,000 in subordinated corporate bonds, respectively.
Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity The following table presents the activity in the ACL on HTM debt securities, as reported under CECL, for the periods indicated:
December 31,
(In thousands)20242023
Beginning balance$— $— 
Charge-offs
— (1,838)
Recoveries
910 — 
(Credit) provision for credit losses
(910)1,838 
Ending balance
$— $— 

The Company evaluated its HTM debt securities with an amortized cost as of December 31, 2024 and 2023 and determined that the expected credit loss on its HTM portfolio was immaterial, and therefore it did not carry an ACL on the HTM portfolio at either date.
The amortized cost and estimated fair values of HTM debt securities by contractual maturity are shown in the table below as of December 31, 2024. 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 years4,790 4,775 
Due after five years through ten years37,351 36,427 
Due after ten years41,000 39,562 
Subtotal83,141 80,764 
Mortgage-related securities434,637 390,060 
Total$517,778 $470,824