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LOANS AND ALLOWANCE FOR LOAN LOSSES - Non Traditional Mortgage Performance Loan to Value Ratio (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | $ 5,951,885 | $ 7,700,873
NTM Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | $ 600,656 | $ 826,731
Consumer | NTM Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 461 | 628
Total loans | $ 600,656 | $ 826,731
Consumer | NTM Loans | Green Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 52,300 | 70,100
Consumer | NTM Loans | Interest only |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 545,400 | 753,100
Consumer | NTM Loans | Negative amortization |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | $ 3,000 | $ 3,500
Consumer | NTM Loans | First lien |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 454 | 618
Total loans | $ 598,357 | $ 824,318
Consumer | NTM Loans | First lien | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 100.00% | 100.00%
Consumer | NTM Loans | First lien | Green Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 69 | 88
Total loans | $ 49,959 | $ 67,729
Consumer | NTM Loans | First lien | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 100.00% | 100.00%
Consumer | NTM Loans | First lien | Interest only |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 376 | 519
Total loans | $ 545,371 | $ 753,061
Consumer | NTM Loans | First lien | Interest only | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 100.00% | 100.00%
Consumer | NTM Loans | First lien | Negative amortization |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 9 | 11
Total loans | $ 3,027 | $ 3,528
Consumer | NTM Loans | First lien | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 100.00% | 100.00%
Consumer | NTM Loans | First lien | Less than 61 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 294 | 392
Total loans | $ 387,730 | $ 551,285
Consumer | NTM Loans | First lien | Less than 61 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 64.80% | 66.90%
Consumer | NTM Loans | First lien | Less than 61 | Green Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 54 | 69
Total loans | $ 37,804 | $ 51,827
Consumer | NTM Loans | First lien | Less than 61 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 75.60% | 76.50%
Consumer | NTM Loans | First lien | Less than 61 | Interest only |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 231 | 312
Total loans | $ 346,899 | $ 495,930
Consumer | NTM Loans | First lien | Less than 61 | Interest only | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 63.60% | 65.90%
Consumer | NTM Loans | First lien | Less than 61 | Negative amortization |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 9 | 11
Total loans | $ 3,027 | $ 3,528
Consumer | NTM Loans | First lien | Less than 61 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 100.00% | 100.00%
Consumer | NTM Loans | First lien | 61-80 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 148 | 218
Total loans | $ 192,195 | $ 259,044
Consumer | NTM Loans | First lien | 61-80 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 32.10% | 31.40%
Consumer | NTM Loans | First lien | 61-80 | Green Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 12 | 17
Total loans | $ 8,531 | $ 13,476
Consumer | NTM Loans | First lien | 61-80 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 17.10% | 19.90%
Consumer | NTM Loans | First lien | 61-80 | Interest only |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 136 | 201
Total loans | $ 183,664 | $ 245,568
Consumer | NTM Loans | First lien | 61-80 | Interest only | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 33.70% | 32.60%
Consumer | NTM Loans | First lien | 61-80 | Negative amortization |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 0 | 0
Total loans | $ 0 | $ 0
Consumer | NTM Loans | First lien | 61-80 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 0.00% | 0.00%
Consumer | NTM Loans | First lien | 81-100 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 9 | 7
Total loans | $ 10,705 | $ 9,867
Consumer | NTM Loans | First lien | 81-100 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 1.80% | 1.20%
Consumer | NTM Loans | First lien | 81-100 | Green Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 3 | 2
Total loans | $ 3,624 | $ 2,426
Consumer | NTM Loans | First lien | 81-100 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 7.30% | 3.60%
Consumer | NTM Loans | First lien | 81-100 | Interest only |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 6 | 5
Total loans | $ 7,081 | $ 7,441
Consumer | NTM Loans | First lien | 81-100 | Interest only | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 1.30% | 1.00%
Consumer | NTM Loans | First lien | 81-100 | Negative amortization |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 0 | 0
Total loans | $ 0 | $ 0
Consumer | NTM Loans | First lien | 81-100 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 0.00% | 0.00%
Consumer | NTM Loans | First lien | Greater than 100 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 3 | 1
Total loans | $ 7,727 | $ 4,122
Consumer | NTM Loans | First lien | Greater than 100 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 1.30% | 0.50%
Consumer | NTM Loans | First lien | Greater than 100 | Green Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 0 | 0
Total loans | $ 0 | $ 0
Consumer | NTM Loans | First lien | Greater than 100 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 0.00% | 0.00%
Consumer | NTM Loans | First lien | Greater than 100 | Interest only |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 3 | 1
Total loans | $ 7,727 | $ 4,122
Consumer | NTM Loans | First lien | Greater than 100 | Interest only | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 1.40% | 0.50%
Consumer | NTM Loans | First lien | Greater than 100 | Negative amortization |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Count | loan | 0 | 0
Total loans | $ 0 | $ 0
Consumer | NTM Loans | First lien | Greater than 100 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage to total loans and leases (percent) | 0.00% | 0.00%

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