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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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