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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non Traditional Mortgages Portfolio (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 5,898,405 | $ 5,951,885
Loan Portfolio Concentration Risk | Loan Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases (percent) | 100.00% | 100.00%
NTM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 437,113 | $ 600,656
NTM Loans | Loan Portfolio Concentration Risk | Loan Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases (percent) | 7.40% | 10.10%
Consumer | NTM Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 344 | 461
Total loans | $ 437,113 | $ 600,656
Consumer | NTM Loans | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases (percent) | 100.00% | 100.00%
Consumer | NTM Loans | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 339 | 454
Total loans | $ 435,515 | $ 598,357
Consumer | NTM Loans | First lien | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases (percent) | 99.60% | 99.60%
Consumer | NTM Loans | Second lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 5 | 7
Total loans | $ 1,598 | $ 2,299
Consumer | NTM Loans | Second lien | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases (percent) | 0.40% | 0.40%
Consumer | NTM Loans | Green Loans (HELOC) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 33,200 | $ 52,300
Consumer | NTM Loans | Green Loans (HELOC) | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 48 | 69
Total loans | $ 31,587 | $ 49,959
Consumer | NTM Loans | Green Loans (HELOC) | First lien | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases (percent) | 7.20% | 8.30%
Consumer | NTM Loans | Green Loans (HELOC) | Second lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 5 | 7
Total loans | $ 1,598 | $ 2,299
Consumer | NTM Loans | Green Loans (HELOC) | Second lien | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases (percent) | 0.40% | 0.40%
Consumer | NTM Loans | Interest Only |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 401,600 | $ 545,400
Consumer | NTM Loans | Interest Only | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 283 | 376
Total loans | $ 401,640 | $ 545,371
Consumer | NTM Loans | Interest Only | First lien | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases (percent) | 91.90% | 90.80%
Consumer | NTM Loans | Negative amortization |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 2,300 | $ 3,000
Consumer | NTM Loans | Negative amortization | First lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Count | loan | 8 | 9
Total loans | $ 2,288 | $ 3,027
Consumer | NTM Loans | Negative amortization | First lien | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage to total loans and leases (percent) | 0.50% | 0.50%

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