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LOANS AND ALLOWANCE FOR LOAN LOSSES - Non Traditional Mortgages Portfolio (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 5,951,885	$ 7,700,873
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	$ 600,656	$ 826,731
NTM Loans | Loan Portfolio Concentration Risk | Loan Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage to total loans and leases (percent)	10.10%	10.70%
Consumer | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	461	628
Total loans	$ 600,656	$ 826,731
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	454	618
Total loans	$ 598,357	$ 824,318
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%	99.70%
Consumer | NTM Loans | Second lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	7	10
Total loans	$ 2,299	$ 2,413
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%	0.30%
Consumer | NTM Loans | Green Loans (HELOC)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 52,300	$ 70,100
Consumer | NTM Loans | Green Loans (HELOC) | First lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	69	88
Total loans	$ 49,959	$ 67,729
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)	8.30%	8.20%
Consumer | NTM Loans | Green Loans (HELOC) | Second lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	7	10
Total loans	$ 2,299	$ 2,413
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%	0.30%
Consumer | NTM Loans | Interest only
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 545,400	$ 753,100
Consumer | NTM Loans | Interest only | First lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	376	519
Total loans	$ 545,371	$ 753,061
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)	90.80%	91.10%
Consumer | NTM Loans | Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 3,000	$ 3,500
Consumer | NTM Loans | Negative amortization | First lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	9	11
Total loans	$ 3,027	$ 3,528
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%	0.40%

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