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FAIR VALUE OF FINANCIAL INSTRUMENTS - Individually evaluated loans (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |  |  |
Individually evaluated loans outstanding balance, net of a valuation allowance | $ 10,778,048,000 |  | $ 10,778,048,000 |  | $ 10,483,324,000
Allowance for credit losses | 72,563,000 |  | 72,563,000 |  | 83,507,000
Provision (recovery) for credit losses | 1,806,000 | $ 6,587,000 | (950,000) | $ 5,039,000 |
Nonrecurring |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |  |  |
Individually evaluated loans outstanding balance, net of a valuation allowance |  |  |  |  | 2,500,000
Allowance for credit losses |  |  |  |  | 1,300,000
Nonrecurring | Level 3 Inputs |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |  |  |
Individually evaluated loans | 352,000 |  | 352,000 |  | 1,179,000
Carrying Amount |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |  |  |
Individually evaluated loans | 10,777,696,000 |  | 10,777,696,000 |  | 10,482,145,000
Carrying Amount | Nonrecurring |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |  |  |
Individually evaluated loans | 352,000 |  | 352,000 |  | $ 1,179,000
Collateral dependent loans | Nonrecurring |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Abstract] |  |  |  |  |
Provision (recovery) for credit losses | $ 0 |  | $ 992,000 |  |

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
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