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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non Traditional Mortgage Loans Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 7,251,480 | $ 5,898,405
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 7,251,480 |
Loans And Finance Receivables, Non-Traditional Mortgages | Loan Portfolio | Loan Portfolio Concentration Risk |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases (percent) | 8.80% | 7.40%
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 635,300 | $ 437,100
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer | Nonperforming |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 4,000 | 8,700
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer | First Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 633,700 |
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer | First Mortgage | Debt-to-Value Ratio, Less than 80 Percent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 631,500 |
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer | Interest Only |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 613,300 | 401,600
Loans And Finance Receivables, Non-Traditional Mortgages | 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 |
Loans And Finance Receivables, Non-Traditional Mortgages | 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 |
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer | Green |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 21,500 | 33,200
Interest only notes balloon payment period | 15 years |
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer | Negative Amortization |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 500 | $ 2,300
Loans And Finance Receivables, Non-Traditional Mortgages | Consumer | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio | Loan Portfolio Concentration Risk | Green | First Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 19,900 |

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