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FAIR VALUE OF FINANCIAL INSTRUMENTS - Individually evaluated loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |
Individually evaluated loans outstanding balance, net of a valuation allowance | $ 10,035,006 |  | $ 10,035,006 |  |  | $ 9,160,808 |  |
Allowance for credit losses | 81,935 | $ 81,255 | 81,935 | $ 81,255 | $ 79,426 | 83,853 | $ 92,760 | $ 41,461
Credit loss (release) provision | 6,440 | $ (7,314) | 5,152 | $ 812 |  |  |  |
Nonrecurring |  |  |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |
Individually evaluated loans outstanding balance, net of a valuation allowance | 2,900 |  | 2,900 |  |  | 2,500 |  |
Allowance for credit losses | 1,400 |  | 1,400 |  |  | 600 |  |
Credit loss (release) provision | 107 |  | 831 |  |  |  |  |
Nonrecurring | Level 3 Inputs |  |  |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |
Individually evaluated loans | 1,453 |  | 1,453 |  |  | 1,900 |  |
Carrying Amount |  |  |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |
Individually evaluated loans | 10,033,553 |  | 10,033,553 |  |  | 9,158,908 |  |
Carrying Amount | Nonrecurring |  |  |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |
Individually evaluated loans | $ 1,453 |  | $ 1,453 |  |  | $ 1,900 |  |

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