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FAIR VALUE OF FINANCIAL INSTRUMENTS - Individually evaluated loans (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |
Individually evaluated loans outstanding balance, net of a valuation allowance | $ 10,688,515 |  | $ 10,701,685
Allowance for credit losses | 76,068 |  | 71,743
Provision (recovery) for credit losses | 5,210 | $ (3,648) |
Nonrecurring |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |
Individually evaluated loans outstanding balance, net of a valuation allowance | 2,400 |  | 7,300
Allowance for credit losses | 1,500 |  | 1,000
Provision (recovery) for credit losses | 807 |  |
Nonrecurring | Level 3 Inputs |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |
Individually evaluated loans | 854 |  | 6,336
Carrying Amount |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |
Individually evaluated loans | 10,687,661 |  | 10,695,349
Carrying Amount | Nonrecurring |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |
Individually evaluated loans | $ 854 |  | $ 6,336

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