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INCOME TAXES - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2014
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax Cuts and Jobs Act of 2017 - Tax benefit from remeasurement | $ 2,100,000 |  |  |
Tax credits on investments in alternative energy partnership | 9,600,000 | $ 38,200,000 | $ 33,400,000 |
Deferred income tax expense | (5,911,000) | (30,372,000) | 5,613,000 |
Pre-tax book income |  | 34,100,000 | 149,400,000 |
Unused tax credit carryforward | 26,900,000 | 27,400,000 |  |
Valuation allowance | 0 | 0 |  |
Income before income taxes and net operating loss carryforward | $ 64,500,000 |  |  |
Percent of domestic and state operating loss carryforwards utilized | 16.80% |  |  |
Unrecognized tax benefits | $ 1,227,000 | 1,047,000 | 0 | $ 0
Total unrecognized tax benefit that, if recognized, would impact the effective tax rate | 1,000,000 |  |  |
Accrued penalties and interest | 0 | 0 |  |
Affordable Housing Partnerships |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Gross investment in limited partnership | 29,300,000 |  |  |
Unfunded amount in limited partnership | 11,500,000 |  |  |
Balance of investment | 20,000,000 | 22,000,000 |  |
Tax deductions | 1,900,000 |  |  |
Tax credits | 1,800,000 |  |  |
Investment amortization | 2,000,000 | 1,400,000 | 394,000 |
Gateway Bancorp |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Section 382 limitation | 474,000 |  |  |
Investment Tax Credit Carryforward | Affordable Housing Partnerships |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Unused tax credit carryforward | 2,700,000 | 849,000 |  |
Domestic Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 2,200,000 |  |  |
Operating loss carryforward utilized | 474,000 |  |  |
Domestic Tax Authority | Research Tax Credit Carryforward |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforward utilized | 400,000 |  |  |
State and Local Jurisdiction |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 9,100,000 |  |  |
Operating loss carryforward utilized | 1,400,000 |  |  |
State and Local Jurisdiction | Research Tax Credit Carryforward |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforward utilized | 500,000 |  |  |
Alternative Energy Partnership |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred income tax expense | 1,000,000 | $ 6,700,000 | $ 5,800,000 |
Alternative Energy Partnership | Investment Tax Credit Carryforward |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforward utilized | 9,600,000 |  |  |
ASU 2018-02 | Accumulated Other Comprehensive Income (Loss) |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Reclassification of stranded tax effects to retained earnings | 496,000 |  |  |
ASU 2018-02 | Retained Earnings |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Reclassification of stranded tax effects to retained earnings | $ (496,000) |  |  |

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