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INVESTMENTS | 3 Months Ended
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Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
INVESTMENTS | INVESTMENTS AFS and HTM Investments The following table summarizes the amortized cost and estimated fair values of AFS and HTM investments, as of the dates indicated:
(In thousands) |  | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
March 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
AFS Investments (carried at fair value): |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | $ | 123,893 |  |  | $ | 3,324 |  |  | $ | (337 | ) |  | $ | 126,880 |
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  | 472,508 |  |  | 15,618 |  |  | (77 | ) |  | 488,049 |
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  | 324,929 |  |  | 9,698 |  |  | (12 | ) |  | 334,615 |
Subordinated corporate bonds |  | 10,546 |  |  | 116 |  |  | (75 | ) |  | 10,587 |
Total AFS investments |  | $ | 931,876 |  |  | $ | 28,756 |  |  | $ | (501 | ) |  | $ | 960,131 |
HTM Investments (carried at amortized cost): |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | $ | 1,300 |  |  | $ | 58 |  |  | $ | — |  |  | $ | 1,358 |
Total HTM investments |  | $ | 1,300 |  |  | $ | 58 |  |  | $ | — |  |  | $ | 1,358 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |
AFS Investments (carried at fair value): |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | $ | 115,632 |  |  | $ | 2,779 |  |  | $ | (328 | ) |  | $ | 118,083 |
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  | 462,593 |  |  | 3,398 |  |  | (2,605 | ) |  | 463,386 |
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  | 325,200 |  |  | 3,183 |  |  | (2,478 | ) |  | 325,905 |
Subordinated corporate bonds |  | 10,553 |  |  | 191 |  |  | — |  |  | 10,744 |
Total AFS investments |  | $ | 913,978 |  |  | $ | 9,551 |  |  | $ | (5,411 | ) |  | $ | 918,118 |
HTM Investments (carried at amortized cost): |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | $ | 1,302 |  |  | $ | 57 |  |  | $ | — |  |  | $ | 1,359 |
Total HTM investments |  | $ | 1,302 |  |  | $ | 57 |  |  | $ | — |  |  | $ | 1,359 |
The net unrealized gain on AFS investments reported within AOCI at March 31, 2020, was $22.2 million, net of a deferred tax liability of $6.1 million. The net unrealized gain on AFS investments reported within AOCI at December 31, 2019, was $3.3 million, net of a deferred tax liability of $890,000. Impaired AFS and HTM Investments: Quarterly, management reviews the Company’s AFS and HTM investments to determine the cause, magnitude and duration of declines in the fair value of each security. Thorough evaluations of the causes of the unrealized losses are performed to determine whether the impairment is temporary or other-than-temporary in nature. Considerations such as the ability of the securities to meet cash flow requirements, levels of credit enhancements, risk of curtailment, and recoverability of invested amount over a reasonable period of time, and the length of time the security is in a loss position, for example, are applied in determining OTTI. Once a decline in value is determined to be other-than-temporary, the cost basis of the security is permanently reduced and a corresponding charge to earnings is recognized. The following table presents the estimated fair values and gross unrealized losses on AFS and HTM investments that were in a continuous loss position that was considered temporary, by length of time that an individual security in each category has 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
March 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AFS Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | 168 |  |  | $ | 20,029 |  |  | $ | (337 | ) |  | $ | — |  |  | $ | — |  |  | $ | 20,029 |  |  | $ | (337 | )
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  | 144 |  |  | 7,626 |  |  | (34 | ) |  | 1,638 |  |  | (43 | ) |  | 9,264 |  |  | (77 | )
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  | 86 |  |  | 5,180 |  |  | (12 | ) |  | — |  |  | — |  |  | 5,180 |  |  | (12 | )
Subordinated corporate bonds |  | 8 |  |  | 4,925 |  |  | (75 | ) |  | — |  |  | — |  |  | 4,925 |  |  | (75 | )
Total AFS investments |  | 406 |  |  | $ | 37,760 |  |  | $ | (458 | ) |  | $ | 1,638 |  |  | $ | (43 | ) |  | $ | 39,398 |  |  | $ | (501 | )
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AFS Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | 11 |  |  | $ | 30,459 |  |  | $ | (328 | ) |  | $ | — |  |  | $ | — |  |  | $ | 30,459 |  |  | $ | (328 | )
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  | 59 |  |  | 162,964 |  |  | (1,850 | ) |  | 63,633 |  |  | (755 | ) |  | 226,597 |  |  | (2,605 | )
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  | 35 |  |  | 66,549 |  |  | (733 | ) |  | 68,614 |  |  | (1,745 | ) |  | 135,163 |  |  | (2,478 | )
Total AFS investments |  | 105 |  |  | $ | 259,972 |  |  | $ | (2,911 | ) |  | $ | 132,247 |  |  | $ | (2,500 | ) |  | $ | 392,219 |  |  | $ | (5,411 | )
At March 31, 2020 and December 31, 2019, unrealized losses within the AFS and HTM investment portfolios were reflective of current interest rates in excess of the yield received on debt investments, and were not indicative of an overall change in credit quality or other factors. At March 31, 2020 and December 31, 2019, gross unrealized losses on the Company's AFS and HTM investments were 1% of their respective fair values. At March 31, 2020, the Company had the intent and ability to retain its debt investments in an unrealized loss position until the decline in value has recovered. Sale of AFS Investments: For the three months ended March 31, 2020 and 2019, the Company did no t sell any AFS investments. AFS and HTM Investments Pledged: At March 31, 2020 and December 31, 2019, AFS and HTM investments with an amortized cost of $712.4 million and $709.0 million and estimated fair values of $735.3 million and $712.4 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. Contractual Maturities: The amortized cost and estimated fair values of the Company's AFS and HTM investments by contractual maturity at March 31, 2020, 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.
(In thousands) |  | Amortized Cost |  | Fair Value
AFS Investments |  |  |  |
Due in one year or less |  | $ | — |  |  | $ | — |
Due after one year through five years |  | 76,517 |  |  | 78,367 |
Due after five years through ten years |  | 215,515 |  |  | 223,272 |
Due after ten years |  | 639,844 |  |  | 658,492 |
Total |  | $ | 931,876 |  |  | $ | 960,131 |
HTM Investments |  |  |  |
Due in one year or less |  | $ | — |  |  | $ | — |
Due after one year through five years |  | 511 |  |  | 532 |
Due after five years through ten years |  | 789 |  |  | 826 |
Due after ten years |  | — |  |  | — |
Total |  | $ | 1,300 |  |  | $ | 1,358 |
Other Investments The following table summarizes the cost and estimated fair values of the Company's investment in equity securities, FHLBB stock and FRBB stock as presented within other investments on the consolidated statements of condition, as of the dates indicated:
(In thousands) |  | Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value / Carrying Value
March 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Equity securities - bank stock (carried at fair value) |  | $ | 544 |  |  | $ | 1,130 |  |  | $ | — |  |  | $ | 1,674 |
FHLBB (carried at cost) |  | 8,008 |  |  | — |  |  | — |  |  | 8,008 |
FRB (carried at cost) |  | 5,374 |  |  | — |  |  | — |  |  | 5,374 |
Total other investments |  | $ | 13,926 |  |  | $ | 1,130 |  |  | $ | — |  |  | $ | 15,056 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Equity securities - bank stock (carried at fair value) |  | $ | 544 |  |  | $ | 1,130 |  |  | $ | — |  |  | $ | 1,674 |
FHLBB (carried at cost) |  | 6,601 |  |  | — |  |  | — |  |  | 6,601 |
FRB (carried at cost) |  | 5,374 |  |  | — |  |  | — |  |  | 5,374 |
Total other investments |  | $ | 12,519 |  |  | $ | 1,130 |  |  | $ | — |  |  | $ | 13,649 |
For the three months ended March 31, 2020 and 2019, the Company recognized an unrealized gain of $0 and $243,000, respectively, due to the change in fair value of its bank stock equity securities, which was presented within other income on the consolidated statements of income. The Company did not record any OTTI on its FHLBB and FRB stock for the three months ended March 31, 2020 and 2019.

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