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FAIR VALUE OF FINANCIAL INSTRUMENTS - Individually evaluated loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 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 | $ 10,747,046 |  | $ 10,747,046 |  | $ 10,701,685
Allowance for credit losses | 77,812 |  | 77,812 |  | 71,743
Provision (recovery) for credit losses | 5,585 | $ 892 | 10,795 | $ (2,756) |
Fair Value, Nonrecurring [Member] |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |  |  |
Individually evaluated loans outstanding balance, net of a valuation allowance | 2,300 |  | 2,300 |  | 7,300
Allowance for credit losses | 1,500 |  | 1,500 |  | 1,000
Provision (recovery) for credit losses |  |  | 807 |  |
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |  |  |
Individually evaluated loans | 823 |  | 823 |  | 6,336
Reported Value Measurement [Member] |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |  |  |
Individually evaluated loans | 10,746,223 |  | 10,746,223 |  | 10,695,349
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |  |  |
Individually evaluated loans | $ 823 |  | $ 823 |  | $ 6,336

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