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Investments | 12 Months Ended
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Dec. 31, 2023
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, 2023 and 2022, the fair value of the Company's trading securities were $4.6 million and $4.0 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, 2023 |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | $ | 6,429 |  |  | $ | 1 |  |  | $ | (44) |  |  | $ | 6,386 |
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  | 525,439 |  |  | 630 |  |  | (65,978) |  |  | 460,091 |
Collateralized mortgage obligations 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 |
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 enterprises |  | 598,845 |  |  | 131 |  |  | (84,957) |  |  | 514,019 |
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  | 122,760 |  |  | — |  |  | (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 |
As of December 31, 2023 and 2022, there was no allowance carried on AFS debt securities. In June of 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 the 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 income. At December 31, 2023 and 2022, the net unrealized losses on the transferred securities reported within AOCI were $46.9 million and $52.2 million, respectively, net of a deferred tax asset of $12.8 million and $14.3 million, respectively. The net unrealized losses on AFS debt securities reported within AOCI (excluding the aforementioned securities transferred from AFS to HTM) at December 31, 2023 and December 31, 2022 were $60.5 million and $79.4 million, respectively, and were net of a deferred tax asset of $16.6 million and $21.7 million, respectively. 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) |  | 2023 |  | 2022 |  | 2021
Proceeds from sales |  | $ | 126,766 |  |  | $ | 36,280 |  |  | $ | — |
Gross realized gains |  | — |  |  | 13 |  |  | — |
Gross realized losses |  | (10,310) |  |  | (925) |  |  | — |
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 Months |  | 12 Months or More |  | Total
(In thousands, except number of holdings) |  | Number of Holdings |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | 6 |  |  | $ | 2,345 |  |  | $ | (6) |  |  | $ | 1,437 |  |  | $ | (38) |  |  | $ | 3,782 |  |  | $ | (44) |
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  | 145 |  |  | 13,474 |  |  | (23) |  |  | 407,200 |  |  | (65,955) |  |  | 420,674 |  |  | (65,978) |
Collateralized mortgage obligations 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 securities |  | 205 |  |  | $ | 35,439 |  |  | $ | (74) |  |  | $ | 488,825 |  |  | $ | (78,848) |  |  | $ | 524,264 |  |  | $ | (78,922) |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | 83 |  |  | $ | 42,276 |  |  | $ | (463) |  |  | $ | — |  |  | $ | — |  |  | $ | 42,276 |  |  | $ | (463) |
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  | 175 |  |  | 118,290 |  |  | (11,521) |  |  | 381,355 |  |  | (73,436) |  |  | 499,645 |  |  | (84,957) |
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  | 64 |  |  | 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 securities |  | 335 |  |  | $ | 215,593 |  |  | $ | (16,957) |  |  | $ | 457,955 |  |  | $ | (84,273) |  |  | $ | 673,548 |  |  | $ | (101,230) |
As of December 31, 2023 and 2022, the unrealized losses on 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 with 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 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. Obligations of states and political subdivision are comprised solely of high credit quality (rated A- of 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. At December 31, 2023 and 2022, total accrued interest receivable on AFS debt securities, which has been excluded from reported amortized cost basis on AFS debt securities, was $1.7 million and $1.9 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 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 |  | $ | 1,000 |  |  | $ | 1,000 |
Due after one year through five years |  | 10,835 |  |  | 9,997 |
Due after five years through ten years |  | 16,276 |  |  | 13,709 |
Due after ten years |  | — |  |  | — |
Subtotal |  | 28,111 |  |  | 24,706 |
Mortgage-related securities |  | 674,826 |  |  | 601,102 |
Total |  | $ | 702,937 |  |  | $ | 625,808 |
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
December 31, 2023 |  |  |  |  |  |  |  |
Obligations of U.S. government-sponsored enterprises |  | $ | 7,593 |  |  | $ | — |  |  | $ | (528) |  |  | $ | 7,065 |
Obligations of states and political subdivisions |  | 56,262 |  |  | 1,242 |  |  | (731) |  |  | 56,773 |
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  | 304,850 |  |  | — |  |  | (21,623) |  |  | 283,227 |
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  | 157,118 |  |  | 515 |  |  | (13,497) |  |  | 144,136 |
Subordinated corporate bonds |  | 19,108 |  |  | 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 subdivisions |  | 55,978 |  |  | 431 |  |  | (1,610) |  |  | 54,799 |
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  | 317,406 |  |  | — |  |  | (24,766) |  |  | 292,640 |
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  | 145,069 |  |  | — |  |  | (13,724) |  |  | 131,345 |
Subordinated corporate bonds |  | 20,673 |  |  | 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. For the year ended December 31, 2023, the Company recorded a provision for credit losses on its HTM debt securities portfolio of $1.8 million for the full write-off of a Signature Bank corporate bond due to Signature Bank’s failure in March 2023. The Company did not previously carry any ACL on the bond. In addition to the write-off of the Signature Bank corporate bond, the Company wrote-off accrued interest totaling $8,000 associated with the Signature Bank corporate bond and recorded a reversal of interest income on the consolidated statements of income for the year ended December 31, 2023. The Company did not record any provisions for credit losses on its HTM debt securities nor write-off any accrued interest for the years ended December 31, 2022 or 2021. 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. The Company evaluated its HTM debt securities with an amortized cost as of December 31, 2023 and 2022 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 following table presents the activity in the ACL on HTM debt securities, as reported under CECL, for the periods indicated:
|  | December 31,
(In thousands) |  | 2023 |  | 2022
Beginning balance |  | $ | — |  |  | $ | — |
HTM debt securities charged-off |  | (1,838) |  |  | — |
Provision for HTM debt securities |  | 1,838 |  |  | — |
Ending balance |  | $ | — |  |  | $ | — |
Subsequent to December 31, 2023, the Company sold the HTM debt security that was previously charged off in 2023 and received proceeds of $910,000 that will be recorded as a recovery and a credit to the provision for HTM debt securities in the first quarter of 2024. As of December 31, 2023 and 2022, 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, 2023, 2022, and 2021. At December 31, 2023 and 2022, total accrued interest receivable on HTM debt securities was $1.7 million 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 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 years |  | 1,790 |  |  | 1,818 |
Due after five years through ten years |  | 35,975 |  |  | 35,840 |
Due after ten years |  | 44,696 |  |  | 45,076 |
Subtotal |  | 82,963 |  |  | 83,232 |
Mortgage-related securities |  | 461,968 |  |  | 427,363 |
Total |  | $ | 544,931 |  |  | $ | 510,595 |
AFS and HTM Debt Securities Pledged At December 31, 2023 and 2022, AFS and HTM debt securities with an amortized cost of $675.5 million and $821.9 million, respectively, and estimated fair values of $607.9 million and $726.5 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, 2023, 2022 and 2021. 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 |
FRB |  | 5,374 |  |  | 5,374 |
Total |  | $ | 15,394 |  |  | $ | 12,713 |

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