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Borrowings
 12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Borrowings BORROWINGS
The following table summarizes the Company's short-term borrowings and junior subordinated debentures as presented on the consolidated statements of condition for the dates indicated. At December 31, 2023 and 2022, the Company did not have any long-term borrowings.
December 31,
2023
Contractual MaturityDecember 31,
2022
(Dollars in thousands)
Outstanding BalanceWeighted
Average
Contractual Rate		20242025202620272028ThereafterOutstanding BalanceWeighted
Average
Contractual Rate
Short-Term Borrowings:
  
Customer repurchase agreements(1)
$200,657 1.56 %$200,657 $— $— $— $— $— $196,451 1.00 %
FHLBB and correspondent bank overnight borrowings(2)
149,950 5.53 %149,950 — — — — — 68,725 4.78 %
Bank term funding program
135,000 4.70 %135,000 — — — — — — — %
Total short-term borrowings
$485,607 3.66 %$485,607 $— $— $— $— $— $265,176 1.98 %
Junior Subordinated Debentures:
CCTA(2)
36,083 4.82 %— — — — — 36,083 36,083 4.62 %
UBCT(2)
8,248 4.65 %— — — — — 8,248 8,248 5.39 %
Total junior subordinated debentures
$44,331 4.79 %$— $— $— $— $— $44,331 $44,331 4.76 %
(1)    Refer to Note 10 for further discussion of customer repurchase agreements.
(2)    The Company has interest rate swap contracts on certain borrowings. Refer to Note 12 for further discussion of derivative instruments.

FHLBB Borrowings

The terms of the Company's outstanding FHLBB borrowings, including overnight funding, were as follows for the dates indicated:
December 31,
(Dollars in thousands)
2023
2022
Stated MaturityOutstanding BalanceWeighted Average Contractual RateOutstanding BalanceWeighted Average Contractual Rate
January 2024
$99,950 5.54 %$18,725 4.38 %
March 2024
50,000 5.51 %50,000 4.93 %
Total$149,950 $68,725 

FHLBB borrowings, if any, are collateralized by a blanket lien on qualified collateral consisting primarily of loans with first mortgages secured by one-to-four family properties, certain commercial real estate loans, certain pledged investment securities and other qualified assets. The carrying value of residential real estate and commercial loans pledged as collateral was $1.9 billion and $1.8 billion at December 31, 2023 and 2022, respectively. The carrying value of investment securities pledged as collateral at the FHLBB was $4.3 million and $22,000 at December 31, 2023 and 2022, respectively.

At December 31, 2023, the Company had a notional amount of $125.0 million in interest rate swap agreements on its FHLBB borrowings, including a $50.0 million forward-starting interest rate swap agreement beginning January 17, 2024. Further discussion on the terms and accounting for the interest rate swap agreements is included within Note 12 of the consolidated financial statements.
Bank Term Funding Program (“BTFP”)

In March 2023, the FRB created the BTFP in response to several well-publicized bank failures to make additional funding available to depository institutions to help assure banks have the ability to meet the needs of all their depositors. The BTFP offers loans of up to one year in length to depository institutions pledging any collateral eligible for purchase by the FRB in open market operations, such as U.S. Treasuries, U.S. agency securities, and U.S. agency MBS, with the assets being valued at par. The interest rate for term advances under the BTFP is the one-year overnight index swap rate plus ten basis points. The interest rated is fixed for a period of one year, without penalty for prepayment, including refinancing under the BTFP. Advances may be made under the BTFP for a period of one-year until March 11, 2024.

In May 2023, the Company executed a $135.0 million advance under the BTFP for a period of one year at a fixed rate of 4.70%. The Company leveraged the BTFP as it provided lower-cost alternative funding and improved the Company’s liquidity position, while simultaneously improving its interest rate risk position given the fixed rate feature and the ability to repay the borrowing without penalty. At December 31, 2023, the Company maintained the advance of $135.0 million under the BTFP.

At December 31, 2023, the Company had pledged as collateral under the BTFP investment securities with a carrying value of $160.9 million.

In January 2024, the Company prepaid its existing $135.0 million advance under the BTFP and added three new tranches under the BTFP totaling $225.0 million at a fixed interest rate of 4.76%. The Company refinanced its existing advance under the BTFP and added additional advances to leverage the terms of the program and provide lower-cost alternative funding that is beneficial for the Company’s liquidity position and interest rate risk position.

Junior Subordinated Debentures

In April 2006, the Company formed CCTA, which issued and sold trust preferred securities to the public. The Company received $36.1 million from the issuance of the trust preferred securities in return for junior subordinated debentures issued by the Company to CCTA. The Company owns all of the $1.1 million of outstanding common securities of CCTA and was presented within other assets on the consolidated statements of condition. The contract interest rate of the trust preferred securities was three-month LIBOR plus 140 basis points, and in accordance with the LIBOR Act effective June 30, 2023, the index transitioned to three month CME term SOFR plus the spread adjustment of 26.161 basis points. At December 31, 2023 and 2022, the interest rate on these trust preferred securities was 6.99% and 5.07%, respectively. The proceeds from the offering were used to repurchase Company common stock under the tender offer completed in May 2006. The trust preferred securities, which pay interest quarterly at the same rate as the junior subordinated debentures held by CCTA, are mandatorily redeemable on June 30, 2036, or may be redeemed by CCTA at par at any time.

In connection with an acquisition in 2008, the Company assumed $8.0 million of trust preferred securities, held through a Delaware trust affiliate, UBCT. In 2006, an aggregate principal amount of $8.2 million of 30-year junior subordinated debt securities were issued to UBCT. The Company owns all of the $248,000 of outstanding common securities of UBCT, and was presented within other assets on the consolidated statements of condition. The Company is obligated to pay interest on their principal sum quarterly. The contract interest rate of the trust preferred securities was three-month LIBOR plus 1.42%, and in accordance with the LIBOR Act effective June 30, 2023 the index transitioned to three month CME term SOFR plus the spread adjustment of 26.161 basis points. At December 31, 2023 and 2022, the interest rate on these trust preferred securities was 7.08% and 5.50%, respectively. The debt securities mature on April 7, 2036, but may be redeemed by the Company at par, in whole or in part, on any interest payment date. The debt securities may also be redeemed by the Company in whole or in part, within 90 days of the occurrence of certain special redemption events.

CCTA and UBCT are Delaware statutory trusts created for the sole purpose of issuing trust preferred securities and investing the proceeds in junior subordinated debentures of the Company. The junior subordinated debentures are the sole assets of the trusts. The Company is the owner of all of the common securities of CCTA and UBCT and fully and unconditionally guarantees each trust’s securities obligations. In accordance with GAAP, CCTA and UBCT are treated as unconsolidated subsidiaries. The common stock investment in the statutory trusts is included in other assets on the consolidated statements of condition. At December 31, 2023, $43.0 million of the trust preferred securities were included in the Company’s total Tier 1 capital and amounted to 8.0% of Tier 1 capital of the Company, or 107 basis points of the Tier 1 capital ratio.

At December 31, 2023, the Company had a notional amount of $43.0 million in interest rate swap agreements on its junior subordinated debentures. Further discussion on the terms and accounting for the interest rate swap agreements is included within Note 12 of the consolidated financial statements.
Interest expense on the subordinated debentures, including the effective portion of the associated interest rate swaps on these debt instruments reclassified from OCI into earnings, totaled $2.2 million, $2.1 million, and $2.5 million for the years ended December 31, 2023, 2022 and 2021, respectively. Refer to Note 12 of the consolidated financial statements for information pertaining to the reclassification of OCI into earnings on the interest rate swaps.

Credit Lines

At December 31, 2023, the Company has the following lines of credit available to it, for which it had no outstanding balances:
•The Bank had an available line of credit with the FHLBB of $9.9 million at December 31, 2023 and 2022. This line of credit serves as overdraft protection should the Company overdraw its account with the FHLBB. The interest rate for this line of credit is set daily by the FHLBB. The line is secured by pledged loan collateral.
•The Company, through the Bank, has an unsecured $50.0 million line of credit with US Bank for which the interest rate is set daily by US Bank.
•The Company, through the Bank, has an unsecured $35.0 million line of credit with PNC Bank for which the interest rate is set daily by PNC Bank.
•The Company, through the Bank, has a secured line of credit of $39.4 million through the FRB's Discount Window for which the interest rate is set by the FRB daily. At December 31, 2023, the Bank pledged investment securities of $47.5 million.