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INVESTMENTS (Tables)
 6 Months Ended
Jun. 30, 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
June 30, 2023    
Obligations of states and political subdivisions$49,110 $11 $(498)$48,623 
MBS issued or guaranteed by U.S. government-sponsored enterprises569,383 38 (82,641)486,780 
CMO issued or guaranteed by U.S. government-sponsored enterprises113,789 — (13,088)100,701 
Corporate bonds25,677 — (3,576)22,101 
Total AFS debt securities$757,959 $49 $(99,803)$658,205 
December 31, 2022    
Obligations of states and political subdivisions$49,678 $11 $(463)$49,226 
MBS issued or guaranteed by U.S. government-sponsored enterprises598,845 131 (84,957)514,019 
CMO issued or guaranteed by U.S. government-sponsored enterprises122,760 — (13,413)109,347 
Corporate bonds25,677 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 FRBB stock as presented within other investments on the consolidated statements of condition, as of the dates indicated:
(In thousands)June 30,
2023		December 31,
2022
FHLBB$9,281 $7,339 
FRB5,374 5,374 
Total other investments$14,655 $12,713 
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
June 30, 2023      
Obligations of states and political subdivisions75 $30,020 $(316)$8,842 $(182)$38,862 $(498)
MBS issued or guaranteed by U.S. government-sponsored enterprises178 7,275 (26)471,342 (82,615)478,617 (82,641)
CMO issued or guaranteed by U.S. government-sponsored enterprises60 — — 100,701 (13,088)100,701 (13,088)
Corporate bonds14 2,724 (879)19,377 (2,697)22,101 (3,576)
Total AFS debt securities327 $40,019 $(1,221)$600,262 $(98,582)$640,281 $(99,803)
December 31, 2022      
Obligations of states and political subdivisions83 42,276 (463)— — 42,276 (463)
MBS issued or guaranteed by U.S. government-sponsored enterprises175 118,290 (11,521)381,355 (73,436)499,645 (84,957)
CMO issued or guaranteed by U.S. government-sponsored enterprises64 47,340 (4,589)62,007 (8,824)109,347 (13,413)
Corporate bonds13 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
The amortized cost and estimated fair values of the Company's AFS debt securities by contractual maturity at June 30, 2023, 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$1,002 $998 
Due after one year through five years13,835 12,483 
Due after five years through ten years59,950 57,243 
Due after ten years— — 
Subtotal74,787 70,724 
Mortgage-related securities683,172 587,481 
Total$757,959 $658,205 
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
June 30, 2023
Obligations of U.S. government-sponsored enterprises$7,525 $— $(639)$6,886 
Obligations of states and political subdivisions56,120 1,174 (963)56,331 
MBS issued or guaranteed by U.S. government-sponsored enterprises311,208 — (24,389)286,819 
CMO issued or guaranteed by U.S. government-sponsored enterprises140,751 — (13,454)127,297 
Corporate bonds18,980 528 (1,251)18,257 
Total HTM debt securities $534,584 $1,702 $(40,696)$495,590 
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 
MBS issued or guaranteed by U.S. government-sponsored enterprises317,406 — (24,766)292,640 
CMO issued or guaranteed by U.S. government-sponsored enterprises145,069 — (13,724)131,345 
Corporate bonds20,673 332 (276)20,729 
Total HTM debt securities$546,583 $763 $(41,153)$506,193 
(1) Amortized cost presented above included unamortized unrealized losses from the aforementioned transfer from AFS to HTM securities as of June 30, 2023 and December 31, 2022, as follows: (1) $1.1 million in obligations of U.S. government-sponsored enterprises at both dates, (2) $5.9 million and $6.1 million in obligations of state and political subdivisions, (3) $36.5 million and $38.4 million in mortgage-backed securities, (4) $19.5 million and $20.7 million in collateralized mortgage obligations, and (5) $101,000 and $117,000 in corporate bonds, respectively.
Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity The amortized cost and estimated fair values of HTM debt securities by contractual maturity at June 30, 2023 are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Mortgage-related securities are shown in total, as their maturities are highly variable.
(In thousands)Amortized
Cost		Fair
Value
Due in one year or less$— $— 
Due after one year through five years2,294 2,301 
Due after five years through ten years23,223 21,712 
Due after ten years57,108 57,461 
Subtotal82,625 81,474 
Mortgage-related securities451,959 414,116 
Total$534,584 $495,590