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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, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 7,289,320 | $ 7,251,480
NTM Loans | Loan Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases (percent) | 11.90% | 8.80%
NTM Loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 870,000 | $ 635,300
NTM Loans | Consumer | Non-performing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 0 | 4,000
Weighted average LTV (percent) | 59.00% |
NTM Loans | Consumer | Interest Only |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 863,200 | 613,300
NTM Loans | Consumer | Interest Only | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Mortgage loan term (in years) | 30 years |
Mortgage loan, flexible initial term (in years) | 1 year |
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 | Green |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 6,800 | $ 21,900
Interest only notes balloon payment period | 15 years |

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