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INVESTMENTS | 6 Months Ended
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Jun. 30, 2018
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 securities, as of the dates indicated:
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
June 30, 2018 |  |  |  |  |  |  |  |  |  |  |
AFS Investments (carried at fair value): |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 4,779 |  |  | $ | 56 |  |  | $ | (3 | ) |  | $ | 4,832 |
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | 512,595 |  |  | 386 |  |  | (17,713 | ) |  | 495,268 |
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | 305,690 |  |  | 47 |  |  | (12,383 | ) |  | 293,354 |
Subordinated corporate bonds | 5,485 |  |  | 82 |  |  | (21 | ) |  | 5,546 |
Total AFS investments | $ | 828,549 |  |  | $ | 571 |  |  | $ | (30,120 | ) |  | $ | 799,000 |
HTM Investments (carried at amortized cost): |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 93,062 |  |  | $ | 133 |  |  | $ | (1,594 | ) |  | $ | 91,601 |
Total HTM investments | $ | 93,062 |  |  | $ | 133 |  |  | $ | (1,594 | ) |  | $ | 91,601 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
AFS Investments (carried at fair value): |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 7,232 |  |  | $ | 103 |  |  | $ | — |  |  | $ | 7,335 |
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | 510,176 |  |  | 597 |  |  | (7,471 | ) |  | 503,302 |
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | 279,575 |  |  | 14 |  |  | (6,790 | ) |  | 272,799 |
Subordinated corporate bonds | 5,484 |  |  | 173 |  |  | — |  |  | 5,657 |
Equity investments(1) | 554 |  |  | 252 |  |  | — |  |  | 806 |
Total AFS investments | $ | 803,021 |  |  | $ | 1,139 |  |  | $ | (14,261 | ) |  | $ | 789,899 |
HTM Investments (carried at amortized cost): |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 94,073 |  |  | $ | 1,077 |  |  | $ | (237 | ) |  | $ | 94,913 |
Total HTM investments | $ | 94,073 |  |  | $ | 1,077 |  |  | $ | (237 | ) |  | $ | 94,913 |
(1) | As of December 31, 2017, equity investments were classified as AFS investments. Effective January 1, 2018, these investments were reclassified to other investments on the consolidated statements of condition as they are no longer eligible to be classified as AFS upon adoption of ASU 2016-01. Refer to Note 2 for further details.
Net unrealized losses on AFS investments at June 30, 2018 included in AOCI amounted to $23.2 million, net of a deferred tax benefit of $6.4 million. Net unrealized losses on AFS investments at December 31, 2017 included in AOCI amounted to $10.3 million, net of a deferred tax benefit of $2.8 million. For the six months ended June 30, 2018 and 2017, the Company purchased debt investments of $100.6 million and $97.3 million, respectively, all of which were designated as AFS investments. Impaired AFS and HTM Investments: Management periodically 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 at June 30, 2018 and December 31, 2017, by length of time that an individual security in each category has been in a continuous loss position:
| Less Than 12 Months |  | 12 Months or More |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AFS Investments: |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 1,517 |  |  | $ | (3 | ) |  | $ | — |  |  | $ | — |  |  | $ | 1,517 |  |  | $ | (3 | )
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | 240,208 |  |  | (6,256 | ) |  | 240,607 |  |  | (11,457 | ) |  | 480,815 |  |  | (17,713 | )
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | 128,698 |  |  | (2,837 | ) |  | 149,438 |  |  | (9,546 | ) |  | 278,136 |  |  | (12,383 | )
Subordinated corporate bonds | 964 |  |  | (21 | ) |  | — |  |  | — |  |  | 964 |  |  | (21 | )
Total AFS investments | $ | 371,387 |  |  | $ | (9,117 | ) |  | $ | 390,045 |  |  | $ | (21,003 | ) |  | $ | 761,432 |  |  | $ | (30,120 | )
HTM Investments: |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 63,572 |  |  | $ | (1,119 | ) |  | $ | 10,229 |  |  | $ | (475 | ) |  | $ | 73,801 |  |  | $ | (1,594 | )
Total HTM investments | $ | 63,572 |  |  | $ | (1,119 | ) |  | $ | 10,229 |  |  | $ | (475 | ) |  | $ | 73,801 |  |  | $ | (1,594 | )
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AFS Investments: |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | $ | 221,466 |  |  | $ | (2,393 | ) |  | $ | 233,971 |  |  | $ | (5,078 | ) |  | $ | 455,437 |  |  | $ | (7,471 | )
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | 102,612 |  |  | (696 | ) |  | 164,389 |  |  | (6,094 | ) |  | 267,001 |  |  | (6,790 | )
Total AFS investments | $ | 324,078 |  |  | $ | (3,089 | ) |  | $ | 398,360 |  |  | $ | (11,172 | ) |  | $ | 722,438 |  |  | $ | (14,261 | )
HTM Investments: |  |  |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 9,317 |  |  | $ | (57 | ) |  | $ | 9,436 |  |  | $ | (180 | ) |  | $ | 18,753 |  |  | $ | (237 | )
Total HTM investments | $ | 9,317 |  |  | $ | (57 | ) |  | $ | 9,436 |  |  | $ | (180 | ) |  | $ | 18,753 |  |  | $ | (237 | )
At June 30, 2018 and December 31, 2017, the Company held 337 and 209 debt investments classified as AFS and HTM with a fair value of $835.2 million and $741.2 million that were in an unrealized loss position totaling $31.7 million and $14.5 million, respectively, that were considered temporary. Of these, MBS and CMOs with a fair value of $390.0 million and $398.4 million were in an unrealized loss position, and have been in an unrealized loss position for 12 months or more, totaling $21.0 million and $11.2 million at June 30, 2018 and December 31, 2017, respectively. The unrealized loss was reflective of current interest rates in excess of the yield received on debt investments and is not indicative of an overall change in credit quality or other factors with the Company's AFS and HTM investment portfolio. At June 30, 2018 and December 31, 2017, gross unrealized losses on the Company's AFS and HTM investments were 3.8% and 2.0%, respectively, of its respective fair value. The Company has the intent and ability to retain its debt investments in an unrealized loss position at June 30, 2018 until the decline in value has recovered. Sale of AFS Investments: The following table details the Company's sales of AFS investments for the period indicated below:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Proceeds from sales of investments |  | $ | 9,898 |  |  | $ | — |  |  | $ | 9,898 |  |  | $ | — |
Gross realized gains |  | 31 |  |  | — |  |  | 31 |  |  | — |
For the three and six months ended June 30, 2018, the Company sold certain AFS investments with a total carrying value of $9.9 million and recorded net gains on the sale of AFS securities of $31,000 within non-interest income in the consolidated statements of income. The Company had not previously recorded any OTTI on these securities sold. The Company did not sell any securities during the three and six months ended June 30, 2017. AFS and HTM Investments Pledged: At June 30, 2018 and December 31, 2017, AFS and HTM investments with an amortized cost of $689.6 million and $702.5 million and estimated fair values of $663.8 million and $691.2 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 June 30, 2018, 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.
| Amortized Cost |  | Fair Value
AFS Investments |  |  |
Due in one year or less | $ | 10,124 |  |  | $ | 10,080 |
Due after one year through five years | 116,798 |  |  | 113,751 |
Due after five years through ten years | 195,301 |  |  | 187,899 |
Due after ten years | 506,326 |  |  | 487,270 |
| $ | 828,549 |  |  | $ | 799,000 |
HTM Investments |  |  |
Due in one year or less | $ | 2,575 |  |  | $ | 2,583 |
Due after one year through five years | 3,598 |  |  | 3,626 |
Due after five years through ten years | 17,022 |  |  | 16,924 |
Due after ten years | 69,867 |  |  | 68,468 |
| $ | 93,062 |  |  | $ | 91,601 |
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:
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
June 30, 2018 |  |  |  |  |  |  |  |  |  |  |
Equity securities - bank stock (carried at fair value)(1) | $ | 544 |  |  | $ | 228 |  |  | $ | — |  |  | $ | 772 |
FHLBB (carried at cost) | 20,196 |  |  | — |  |  | — |  |  | 20,196 |
FRB (carried at cost) | 5,374 |  |  | — |  |  | — |  |  | 5,374 |
Total other investments | $ | 26,114 |  |  | $ | 228 |  |  | $ | — |  |  | $ | 26,342 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
FHLBB (carried at cost) | $ | 18,296 |  |  | $ | — |  |  | $ | — |  |  | $ | 18,296 |
FRB (carried at cost) | 5,374 |  |  | — |  |  | — |  |  | 5,374 |
Total other investments | $ | 23,670 |  |  | $ | — |  |  | $ | — |  |  | $ | 23,670 |
(1) | Effective January 1, 2018, these investments were reclassified to other investments on the consolidated statements of condition as they are no longer eligible for AFS classification upon adoption of ASU 2016-01. Refer to Note 2 for further details.
For the three and six months ended June 30, 2018, the Company recognized an unrealized gain (loss) of $11,000 and $(24,000), respectively, due to the change in fair value of its bank stock equity securities, and has been presented within other income on the consolidated statements of income. In addition, the Company's investment in a reinsurance program liquidated during the three months ended March 31, 2018, and a gain of $195,000 was recognized within other income on the Company's consolidated statements of income for the six months ended June 30, 2018. The Bank is a member of the FHLBB and FRBB, and as a member, the Bank is required to hold a certain amount of FHLBB and FRB common stock. This stock is a non-marketable equity security and is reported at cost. The Company evaluates its FHLBB and FRB common stock for impairment based on the ultimate recoverability of the par value rather than by recognizing temporary declines in value. For the three or six months ended June 30, 2018 and 2017, the Company did not record any other-than-temporary impairment on its FHLBB and FRB stock.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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