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INCOME TAXES - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |
Income tax credits recognized |  | $ 3,400,000 | $ 9,600,000 |
Deferred income tax expense | $ (9,259,000) | (622,000) | (5,911,000) |
Unused tax credit carryforward | 30,200,000 | 30,700,000 |  |
Valuation allowance | 0 | 0 |  |
Income before income taxes and net operating loss carryforward | $ 32,000,000.0 |  |  |
Percent of domestic and state operating loss carryforwards utilized | 5.90% |  |  |
Unrecognized tax benefits | $ 924,000 | 977,000 | 1,227,000 | $ 1,047,000
Total unrecognized tax benefit that, if recognized, would impact the effective tax rate | 701,000 |  |  |
Accrued penalties and interest | 0 | 0 |  |
Alternative Energy Partnership |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred income tax expense |  | 362,000 | 1,000,000.0 |
Affordable Housing Partnerships |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Gross investment in limited partnership | 61,300,000 |  |  |
Unfunded amount in limited partnership | 18,300,000 |  |  |
Balance of investment | 43,200,000 | 36,500,000 |  |
Tax deductions | 7,200,000 | 7,800,000 |  |
Proportional amortization recognized | 5,300,000 | 3,500,000 | $ 2,000,000.0 |
Investment Tax Credit Carryforward |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforward utilized | 4,700,000 |  |  |
Investment Tax Credit Carryforward | Affordable Housing Partnerships |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Unused tax credit carryforward | 9,000,000.0 | $ 3,100,000 |  |
Domestic Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 2,800,000 |  |  |
Operating loss carryforward utilized | 474,000 |  |  |
Domestic Tax Authority | Research Tax Credit Carryforward |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforward utilized | 250,000 |  |  |
State and Local Jurisdiction |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 5,200,000 |  |  |
State and Local Jurisdiction | Research Tax Credit Carryforward |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforward utilized | 350,000 |  |  |
State and Local Jurisdiction | Low Income Housing Tax Credit |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforward utilized | 151,000 |  |  |
Gateway Bancorp |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Section 382 limitation | $ 474,000 |  |  |

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