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LOANS - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) Loan Contract | Dec. 31, 2020 USD ($) Loan | Dec. 31, 2019 USD ($) Loan
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Loans held for sale, at lower of cost or fair value | $ 34,051,000 | $ 18,520,000 |
Gain (loss) on loans held for sale at lower of cost or fair value | 1,142,000 | 7,426,000 | $ (10,000)
Impaired non-accrual loans | 15,573,000 | 11,410,000 |
Charge-off | 7,100,000 |  |
Impaired non-accrual loans performing troubled debt restructured | 2,500,000 | 201,000 |
Allowance allocated to troubled debt restructured loans | 0 | 3,000 |
Allowance allocated to non accrual loans |  | $ 0 |
Loan receivable, validate risk ratings performed for large sample or 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 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 | $ 500,000 |  |
Bank modified loans and contracts | Loan | 5 | 4 | 7
Post-modification outstanding recorded investment | $ 2,691,000 | $ 462,000 | $ 6,558,000
Loan modifications | 947,000,000.0 |  |
Troubled debt restructurings specific reserves to customers | $ 0 | 3,000,000,000 |
Deferral [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Bank modified loans and contracts | Contract | 542 |  |
Bank modified loans and contracts | Loan | 6 |  |
Post-modification outstanding recorded investment | $ 25,551,000 |  |
Deferral [Member] | Loan Level Swaps [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Bank modified loans and contracts | Contract | 1 |  |
Post-modification outstanding recorded investment | $ 12,800,000 |  |
Substandard [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Financing receivable impaired loan | 15,700,000 | 16,200,000 |
Minimum [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Loan receivable, validate risk ratings performed for large sample of borrowers with relationship, value | 1,000,000 |  |
Maximum [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Loan receivable, validate risk ratings performed for small sample of borrowers with relationship, value | 1,000,000 |  |
Potential Problem Loans |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Loans held for sale, at lower of cost or fair value | 6,700,000 |  |
Gain (loss) on loans held for sale at lower of cost or fair value | 282,000 |  |
Residential Mortgage [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Loans held for sale, at lower of cost or fair value | 12,200,000 |  |
Gain (loss) on loans held for sale at lower of cost or fair value | 362,000 |  |
Investment Property [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Impaired non-accrual loans | $ 12,750,000 |  |
Investment Property [Member] | Commercial Real Estate Portfolio Segment [Member] | Deferral [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Bank modified loans and contracts | Loan | 1 |  |
Post-modification outstanding recorded investment | $ 12,750,000 |  |
Commercial and Industrial Sector [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Loans held for sale, at lower of cost or fair value |  |  | $ 5,000,000.0
Number of loan sold | Loan |  |  | 1
Paycheck Protection Program [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Loans held for sale, at lower of cost or fair value | 56,500,000 | 355,000,000.0 |
Gain (loss) on loans held for sale at lower of cost or fair value | $ 1,100,000 | $ 7,400,000 |

X
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