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LOANS - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) Loan | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Loans held for sale, at lower of cost or fair value | $ 14,667,000 | $ 3,542,000 |
Gain (loss) on loans held for sale at lower of cost or fair value | (10,000) | (4,392,000) | $ 412,000
Impaired non-accrual loans | 28,881,000 | 25,715,000 |
Impaired non-accrual loans performing troubled debt restructured | 2,400,000 | 4,300,000 |
Allowance allocated to troubled debt restructured loans | 2,800,000 | 262,000 |
Allowance allocated to non accrual loans | 2,700,000 | 161,000 |
Loan receivable, validate risk ratings performed for new lending to existing relationships | 1,000,000 |  |
Loan receivable, validate risk ratings performed for criticized and classified rated borrowers with relationship exposure, value | 500,000 |  |
Loan receivable, validate risk ratings performed for random sample of borrowers with relationship, value | 1,000,000 |  |
Loan receivable, validate risk ratings performed for new regulation "O" loan commitments, value | 1,000,000 |  |
Loan receivable validate risk ratings performed for leveraged loans, value | 1,000,000 |  |
Loan receivable validate risk ratings performed for no borrower with commitments, value | 250,000 |  |
Troubled debt restructurings specific reserves to customers | 2,800,000 | 262,000 |
Substandard [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Financing receivable impaired loan | $ 35,900,000 | 31,200,000 |
Multifamily Property [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Loans held for sale, at lower of cost or fair value |  | $ 131,300,000 |
Multifamily Property [Member] | Residential Portfolio Segment [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Loans held for sale, at lower of cost or fair value |  |  | $ 109,900,000
Commercial and Industrial Sector [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Number of loan sold | Loan | 1 |  |
Loans held for sale, at lower of cost or fair value | $ 5,000,000 |  |

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- Definition Allowance on non accrual troubled debt restructured loans in financing receivables that are on nonaccrual status as of the balance sheet date. + References No definition available. + Details
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- Definition Allowance on troubled debt restructured loans in financing receivables. + References No definition available. + Details
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- Definition Amount of investment in specific reserve accrual financing receivables (after modification) modified by troubled debt restructurings. + References No definition available. + Details
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- Definition Impaired non accrual troubled debt restructured loans in financing receivables that are on nonaccrual status as of the balance sheet date. + References No definition available. + Details
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- Definition Loan receivable, validate risk ratings performed for criticized and classified rated borrowers with relationship exposure, value. + References No definition available. + Details
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- Definition Loan receivable validate risk ratings performed for leveraged loans, value. + References No definition available. + Details
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- Definition Loan receivable, validate risk ratings performed for new lending to existing relationships, value. + References No definition available. + Details
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- Definition Loan receivable, validate risk ratings performed for new regulation loan commitments, value. + References No definition available. + Details
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