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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non Traditional Mortgage Loans Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 6,961,032 | $ 7,115,038
NTM Loans | Loan Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases (percent) | 11.40% | 12.10%
NTM Loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 792,000 | $ 862,300
Decrease in Non-Traditional Mortgage portfolio loans | 70,400 |
NTM Loans | Consumer | Non-performing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 15,300 | $ 3,000
Weighted average LTV (percent) | 60.00% |
NTM Loans | Consumer | Interest Only | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Mortgage loan term (in years) | 40 years |
Mortgage loan, flexible initial term (in years) | 10 years |
NTM Loans | Consumer | Interest Only | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Mortgage loan, flexible initial term (in years) | 1 year |
NTM Loans | Consumer | Loan Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Decrease in Non-Traditional Mortgage portfolio loans (percent) | 8.20% |

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