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INVESTMENTS (Tables) | 6 Months Ended
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Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract] |  |
Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities | 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
June 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Equity securities - bank stock (carried at fair value) |  | $ | 544 |  |  | $ | 1,130 |  |  | $ | — |  |  | $ | 1,674 |
FHLBB (carried at cost) |  | 8,079 |  |  | — |  |  | — |  |  | 8,079 |
FRB (carried at cost) |  | 5,374 |  |  | — |  |  | — |  |  | 5,374 |
Total other investments |  | $ | 13,997 |  |  | $ | 1,130 |  |  | $ | — |  |  | $ | 15,127 |
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 |
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
June 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |
AFS Investments (carried at fair value): |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | $ | 121,347 |  |  | $ | 5,973 |  |  | $ | (193 | ) |  | $ | 127,127 |
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  | 516,580 |  |  | 19,687 |  |  | (42 | ) |  | 536,225 |
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  | 361,860 |  |  | 11,781 |  |  | (109 | ) |  | 373,532 |
Subordinated corporate bonds |  | 10,538 |  |  | 285 |  |  | (44 | ) |  | 10,779 |
Total AFS investments |  | $ | 1,010,325 |  |  | $ | 37,726 |  |  | $ | (388 | ) |  | $ | 1,047,663 |
HTM Investments (carried at amortized cost): |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | $ | 1,299 |  |  | $ | 89 |  |  | $ | — |  |  | $ | 1,388 |
Total HTM investments |  | $ | 1,299 |  |  | $ | 89 |  |  | $ | — |  |  | $ | 1,388 |
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 |
Unrealized Gross Losses and Estimated Fair Values of Investment Securities by Length of Time that Individual Securities in Each Category in Continuous Loss Position | 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
June 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AFS Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions |  | 4 |  |  | $ | 8,249 |  |  | $ | (193 | ) |  | $ | — |  |  | $ | — |  |  | $ | 8,249 |  |  | $ | (193 | )
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  | 8 |  |  | 16,635 |  |  | (27 | ) |  | 1,602 |  |  | (15 | ) |  | 18,237 |  |  | (42 | )
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  | 5 |  |  | 22,156 |  |  | (109 | ) |  | — |  |  | — |  |  | 22,156 |  |  | (109 | )
Subordinated corporate bonds |  | 2 |  |  | 1,956 |  |  | (44 | ) |  | — |  |  | — |  |  | 1,956 |  |  | (44 | )
Total AFS investments |  | 19 |  |  | $ | 48,996 |  |  | $ | (373 | ) |  | $ | 1,602 |  |  | $ | (15 | ) |  | $ | 50,598 |  |  | $ | (388 | )
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 | )
Schedule of Sale of AFS Investments | The following table details the Company's sales of AFS investments for the periods indicated below:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(In thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Proceeds from sales of investments(1) |  | $ | — |  |  | $ | 45,826 |  |  | $ | — |  |  | $ | 45,826 |
Gross realized gains |  | — |  |  | 371 |  |  | — |  |  | 371 |
Gross realized losses |  | — |  |  | (344 | ) |  | — |  |  | (344 | )
(1) The Company had no t previously recorded any OTTI on these investments sold. | [1]
Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity | The amortized cost and estimated fair values of the Company's AFS and HTM investments by contractual maturity at June 30, 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 |  | $ | 4,439 |  |  | $ | 4,487 |
Due after one year through five years |  | 64,370 |  |  | 66,655 |
Due after five years through ten years |  | 225,186 |  |  | 238,559 |
Due after ten years |  | 716,330 |  |  | 737,962 |
Total |  | $ | 1,010,325 |  |  | $ | 1,047,663 |
HTM Investments |  |  |  |
Due in one year or less |  | $ | — |  |  | $ | — |
Due after one year through five years |  | 511 |  |  | 542 |
Due after five years through ten years |  | 788 |  |  | 846 |
Due after ten years |  | — |  |  | — |
Total |  | $ | 1,299 |  |  | $ | 1,388 |
[1] | (1) The Company had no t previously recorded any OTTI on these investments sold.

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