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INVESTMENTS
 3 Months Ended
Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract]  
INVESTMENTS INVESTMENTS
Trading Securities

Trading securities are reported on the Company's consolidated statements of condition at fair value. As of March 31, 2025 and December 31, 2024, the fair value of the Company's trading securities was $4.9 million and $5.2 million, respectively. These securities are held in a rabbi trust account and invested in mutual funds. The trading securities will be used for future payments associated with the Company's deferred compensation plan for eligible employees and directors.
AFS Debt Securities

AFS debt securities are reported on the Company's consolidated statements of condition at fair value. 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, 2025    
Obligations of states and political subdivisions$5,421 $1 $(108)$5,314 
MBS issued or guaranteed by U.S. government-sponsored enterprises
686,698 4,303 (57,809)633,192 
CMO issued or guaranteed by U.S. government-sponsored enterprises
188,333 1,026 (7,976)181,383 
Subordinated corporate bonds
17,693 — (1,452)16,241 
Total AFS debt securities$898,145 $5,330 $(67,345)$836,130 
December 31, 2024    
Obligations of states and political subdivisions$5,423 $— $(134)$5,289 
MBS issued or guaranteed by U.S. government-sponsored enterprises493,766 353 (69,163)424,956 
CMO issued or guaranteed by U.S. government-sponsored enterprises156,131 502 (9,154)147,479 
Subordinated corporate bonds
17,683 — (1,658)16,025 
Total AFS debt securities$673,003 $855 $(80,109)$593,749 

As of March 31, 2025 and December 31, 2024, there was no allowance carried on AFS debt securities.

In 2022, the Company transferred securities with a fair value of $520.3 million from AFS to HTM. The unrealized losses on the AFS debt securities at the time of transfer were $72.1 million, pre-tax, and were reported within AOCI. These unrealized losses are being amortized over the remaining life of the securities from AOCI into the HTM securities on the consolidated statements of condition. As of March 31, 2025, the net unrealized losses on the transferred securities reported within AOCI were $40.7 million, net of a deferred tax asset of $11.8 million, and as of December 31, 2024 were $41.8 million, net of a deferred tax asset of $11.4 million.

The net unrealized losses on AFS debt securities reported within AOCI (excluding the aforementioned securities transferred from AFS to HTM) as of March 31, 2025 and December 31, 2024, were $49.0 million, net of a deferred tax asset of $14.1 million, and $62.2 million, net of a deferred tax asset of $17.0 million, respectively.

The following table details the Company's sales of AFS debt securities for the periods indicated below:

Three Months Ended
March 31,
(In thousands)20252024
Proceeds from sales(1)
$56,432 $— 
Gross realized gains
— — 
Gross realized losses— — 
(1)     The Company sold certain AFS debt securities acquired in the acquisition of Northway shortly after the acquisition date at fair value, and, therefore, no gain or loss was recognized on the sale.
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, 2025     
Obligations of states and political subdivisions9 $719 $(3)$3,618 $(105)$4,337 $(108)
MBS issued or guaranteed by U.S. government-sponsored enterprises141 22,408 (67)353,254 (57,742)375,662 (57,809)
CMO issued or guaranteed by U.S. government-sponsored enterprises52 46,848 (151)54,633 (7,825)101,481 (7,976)
Subordinated corporate bonds
9 — — 15,741 (1,452)15,741 (1,452)
Total AFS debt securities211 $69,975 $(221)$427,246 $(67,124)$497,221 $(67,345)
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 enterprises136 36,732 (260)352,823 (68,903)389,555 (69,163)
CMO issued or guaranteed by U.S. government-sponsored enterprises47 36,146 (227)55,540 (8,927)91,686 (9,154)
Subordinated corporate bonds
10 494 (6)15,531 (1,652)16,025 (1,658)
Total AFS debt securities204 $74,749 $(500)$427,491 $(79,609)$502,240 $(80,109)

For the three months ended March 31, 2025 and 2024, the unrealized losses on the Company's AFS debt securities have not been recognized into income because management does not intend to sell, and it is not more-likely-than-not it will be required to sell, any of the AFS debt securities before recovery of its amortized cost basis. Furthermore, the unrealized losses were due to changes in interest rates and other market conditions and were not reflective of credit events. Agency-backed and government-sponsored enterprise securities have a long history of no credit losses, including during times of severe stress. The principal and interest payments on agency guaranteed debt is backed by the U.S. government. Government-sponsored enterprises similarly guarantee principal and interest payments and securities backed by government-sponsored enterprises carry an implicit guarantee from the U.S. Department of the Treasury. Additionally, government-sponsored enterprise securities are exceptionally liquid, readily marketable, and provide a substantial amount of price transparency and price parity, indicating a perception of zero credit losses. Municipal debt holdings are comprised of high credit quality (rated A- or higher) state and municipal obligations. High credit quality state and municipal obligations have a history of zero to near-zero credit loss. Subordinated corporate bonds are primarily comprised of investment grade senior notes and senior subordinated notes of other financial institutions.
As of March 31, 2025 and December 31, 2024, total accrued interest receivable on AFS debt securities, which has been excluded from reported amortized cost basis on AFS debt securities, was $2.3 million and $1.7 million, respectively, and was reported within other assets on the consolidated statements of condition. An allowance was not carried on the accrued interest receivable at either date.
The amortized cost and estimated fair values of the Company's AFS debt securities by contractual maturity as of March 31, 2025, 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$116 $116 
Due after one year through five years11,695 11,207 
Due after five years through ten years11,303 10,232 
Due after ten years— — 
Subtotal23,114 21,555 
Mortgage-related securities875,031 814,575 
Total$898,145 $836,130 

HTM Debt Securities

HTM debt securities are reported on the Company's consolidated statements of condition at amortized cost. 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, 2025
Obligations of U.S. government-sponsored enterprises$7,763 $— $(471)$7,292 
Obligations of states and political subdivisions55,588 27 (2,330)53,285 
MBS issued or guaranteed by U.S. government-sponsored enterprises289,272 — (23,035)266,237 
CMO issued or guaranteed by U.S. government-sponsored enterprises139,650 181 (13,169)126,662 
Subordinated corporate bonds
24,409 608 (321)24,696 
Total HTM debt securities $516,682 $816 $(39,326)$478,172 
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 enterprises292,170 — (28,980)263,190 
CMO issued or guaranteed by U.S. government-sponsored enterprises142,467 150 (15,747)126,870 
Subordinated corporate bonds
19,365 476 (430)19,411 
Total HTM debt securities$517,778 $722 $(47,676)$470,824 
(1)Amortized cost presented above includes unamortized unrealized losses from the aforementioned transfer from AFS to HTM securities that occurred in 2022. As of March 31, 2025 and December 31, 2024, the unamortized unrealized losses on the 2022 transfer included within amortized cost were as follows: (1) $823,000 and $856,000 in obligations of U.S. government-sponsored enterprises, (2) $5.0 million and $5.1 million in obligations of state and political subdivisions, (3) $29.9 million and $30.8 million in MBS, (4) $15.9 million and $16.4 million in CMO, and (5) $47,000 and $54,000 in subordinated corporate bonds, respectively.

In the first quarter of 2023, the Company wrote-off its $1.8 million Signature Bank corporate bond in response to Signature Bank's failure. The write-off was recorded as a provision on HTM debt securities in the consolidated statements of income. During the first quarter of 2024, the Company sold the Signature Bank corporate bond and recovered $910,000, which was recorded as a credit for credit losses on HTM debt securities in the consolidated statements of income. The following table presents the activity in the ACL on HTM debt securities for the periods indicated:
Three Months Ended
March 31,
(In thousands)20252024
Beginning balance
$— $— 
Charge-offs
— — 
Recoveries
— 910 
(Credit) provision for credit losses
— (910)
Ending balance
$— $— 

The Company evaluated its HTM debt securities with an amortized cost as of March 31, 2025 and December 31, 2024, 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 HTM debt securities portfolio is comprised of the same types of securities as the AFS debt securities portfolio. Refer to the discussion above for considerations of credit risk.

As of March 31, 2025 and December 31, 2024, none of the Company's HTM debt securities were past due or on non-accrual status. The Company did not recognize any interest income on non-accrual HTM debt securities during the three months ended March 31, 2025 and 2024. As of March 31, 2025 and December 31, 2024, total accrued interest receivable on HTM debt securities was $1.4 million and $1.6 million, respectively, and no allowance was provided for. Accrued interest on HTM debt securities is reported within other assets on the consolidated statements of condition and excluded from reported amortized cost.

The amortized cost and estimated fair values of HTM debt securities by contractual maturity as of March 31, 2025 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$356 $355 
Due after one year through five years7,434 7,350 
Due after five years through ten years33,906 33,475 
Due after ten years46,064 44,093 
Subtotal87,760 85,273 
Mortgage-related securities428,922 392,899 
Total$516,682 $478,172 

AFS and HTM Debt Securities Pledged

As of March 31, 2025 and December 31, 2024, AFS and HTM debt securities with an amortized cost of $743.5 million and $519.9 million and estimated fair values of $680.5 million and $449.0 million, respectively, were pledged to secure FHLBB advances, FRB advances, public deposits, and securities sold under agreements to repurchase and for other purposes required or permitted by law.

Other Investments

The Company's FHLBB, FRB and other correspondent bank common stock are each reported at cost within other investments on the consolidated statements of condition. The Company evaluates these investments for impairment based on the ultimate recoverability of the par value. The Company did not record any impairment on its other investments for the three months ended March 31, 2025 and 2024.
The following table summarizes the Company's other investments as presented on the consolidated statements of condition, as of the dates indicated:
(In thousands)March 31,
2025		December 31,
2024
FHLBB$17,513 $17,140 
FRB8,701 5,374 
Other
70 — 
Total other investments$26,284 $22,514