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Investments
12 Months Ended
Dec. 31, 2021
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 December 31, 2021 and 2020, the fair value of the Company's trading securities were $4.4 million and $4.2 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
December 31, 2021        
Obligations of U.S. government-sponsored enterprises$8,585 $— $(241)$8,344 
Obligations of states and political subdivisions112,086 5,392 — 117,478 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises1,003,869 7,856 (11,468)1,000,257 
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises361,781 2,835 (5,767)358,849 
Subordinated corporate bonds22,660 152 (254)22,558 
Total AFS debt securities$1,508,981 $16,235 $(17,730)$1,507,486 
December 31, 2020        
Obligations of states and political subdivisions$119,608 $7,627 $(115)$127,120 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises547,396 19,796 (574)566,618 
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises399,937 10,652 (135)410,454 
Subordinated corporate bonds
11,533 186 (98)11,621 
Total AFS debt securities$1,078,474 $38,261 $(922)$1,115,813 

As of December 31, 2021 and 2020, there was no allowance carried on AFS debt securities.

At December 31, 2021, net unrealized losses on AFS debt securities reported within AOCI were $1.2 million, net of a deferred tax asset of $321,000. At December 31, 2020, net unrealized gains on AFS debt securities reported within AOCI were $29.3 million, net of a deferred tax liability of $8.0 million.

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)202120202019
Proceeds from sales of AFS debt securities(1)
$— $— $207,001 
Gross realized gains— — 1,427 
Gross realized losses— — (1,532)
(1)    For the year ended December 31, 2019, the Company had not previously recorded any OTTI on AFS debt securities sold.
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:

Less Than 12 Months12 Months or MoreTotal
(In thousands, except number of holdings)Number of HoldingsFair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
December 31, 2021            
Obligations of U.S. government-sponsored enterprises$8,344 $(241)$— $— $8,344 $(241)
Obligations of states and political subdivisions— — — — — — — 
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises113 659,851 (8,999)61,978 (2,469)721,829 (11,468)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises56 191,456 (4,602)38,117 (1,165)229,573 (5,767)
Subordinated corporate bonds11,932 (232)979 (22)12,911 (254)
Total AFS debt securities180 $871,583 $(14,074)$101,074 $(3,656)$972,657 $(17,730)
December 31, 2020            
Obligations of states and political subdivisions$2,404 $(115)$— $— $2,404 $(115)
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises15 61,222 (568)980 (6)62,202 (574)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises39,107 (135)— — 39,107 (135)
Subordinated corporate bonds
4,902 (98)— — 4,902 (98)
Total AFS debt securities30 $107,635 $(916)$980 $(6)$108,615 $(922)

As of December 31, 2021 and 2020, the unrealized losses on 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 not reflective of credit events. The issuers continue to make timely principal and interest payments on the bonds.

At December 31, 2021 and 2020, total accrued interest receivable on AFS debt securities, which has been excluded from reported amortized cost basis on AFS debt securities, was $3.4 million and $3.1 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.

At December 31, 2021, the amortized cost and estimated fair values of AFS debt securities, by contractual maturity, were as 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$3,718 $3,735 
Due after one year through five years5,661 6,001 
Due after five years through ten years86,929 89,042 
Due after ten years47,022 49,602 
     Subtotal143,330 148,380 
Mortgage-related securities1,365,651 1,359,106 
     Total$1,508,981 $1,507,486 

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
Unrealized
Gains
Unrealized
Losses
Fair
Value
December 31, 2021        
Obligations of states and political subdivisions$1,291 $89 $— $1,380 
Total HTM debt securities$1,291 $89 $— $1,380 
December 31, 2020        
Obligations of states and political subdivisions$1,297 $114 $— $1,411 
Total HTM debt securities$1,297 $114 $— $1,411 

As of December 31, 2021 and 2020, the Company’s HTM debt securities portfolio was made up of three investment-grade municipal debt securities, of which two securities also carried credit enhancements. The HTM debt securities portfolio was comprised solely of high credit quality (rated AA or higher) state and municipal obligations. High credit quality state and municipal obligations have a history of zero to near-zero credit loss. As a result, the Company determined that the expected credit loss on its HTM portfolio was immaterial, and therefore, an allowance was not carried on its HTM debt securities at December 31, 2021 or 2020.

As of December 31, 2021 and 2020, 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 years ended December 31, 2021 and 2020. At December 31, 2021 and 2020, total accrued interest receivable on HTM debt securities, which has been excluded from reported amortized cost basis on HTM debt securities, was $10,000 at each date and reported within other assets on the consolidated statements of condition. An allowance was not carried on the accrued interest receivable at either date.

At December 31, 2021, the amortized cost and estimated fair values of HTM debt securities, by contractual maturity, were as 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.
(In thousands)Amortized
Cost
Fair
Value
Due in one year or less$— $— 
Due after one year through five years866 920 
Due after five years through ten years425 460 
Due after ten years— — 
Total$1,291 $1,380 
AFS and HTM Debt Securities Pledged

At December 31, 2021 and 2020, AFS and HTM debt securities with an amortized cost of $640.1 million and $485.0 million, respectively, and estimated fair values of $641.2 million and $507.1 million, respectively, were pledged to secure FHLBB 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 and FRB common stock are 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 FHLBB and FRB stock for the years ended December 31, 2021 and 2020.

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, 2021December 31, 2020
FHLBB$4,906 $6,167 
FRB5,374 5,374 
Total$10,280 $11,541