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FAIR VALUE OF FINANCIAL INSTRUMENTS - Individually evaluated loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |
Individually evaluated loans | $ 6,300 |  |
Individually evaluated loans outstanding balance, net of a valuation allowance | 10,701,685 | $ 10,483,324 |
Allowance for credit losses | 71,743 | 83,507 |
Provision for credit losses | 2,770 | 5,374 | $ 6,212
Nonrecurring |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |
Individually evaluated loans outstanding balance, net of a valuation allowance | 7,300 | 2,500 |
Allowance for credit losses | 1,000 | 1,300 |
Provision for credit losses | 371,000 | 700 |
Nonrecurring | Level 3 Inputs |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |
Individually evaluated loans | 6,336 | 1,179 |
Carrying Amount |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |
Individually evaluated loans | 10,695,349 | 10,482,145 |
Carrying Amount | Nonrecurring |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |
Individually evaluated loans | $ 6,336 | $ 1,179 |

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