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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non Traditional Mortgage Performance Loan to Value Ratio (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($) loan
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 5,898,405	$ 5,951,885
NTM Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 437,113	$ 600,656
Consumer | NTM Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Count | loan	344	461
Total loans	$ 437,113	$ 600,656
Consumer | NTM Loans | Green Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	33,200	52,300
Consumer | NTM Loans | Interest Only
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	401,600	545,400
Consumer | NTM Loans | Negative amortization
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 2,300	$ 3,000
Consumer | NTM Loans | First lien
Financing Receivable, Credit Quality Indicator [Line Items]
Count | loan	339	454
Total loans	$ 435,515	$ 598,357
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	48	69
Total loans	$ 31,587	$ 49,959
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	283	376
Total loans	$ 401,640	$ 545,371
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	8	9
Total loans	$ 2,288	$ 3,027
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	240	294
Total loans	$ 299,342	$ 387,730
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)	68.70%	64.80%
Consumer | NTM Loans | First lien | Less than 61 | Green Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Count | loan	42	54
Total loans	$ 25,946	$ 37,804
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)	82.10%	75.60%
Consumer | NTM Loans | First lien | Less than 61 | Interest Only
Financing Receivable, Credit Quality Indicator [Line Items]
Count | loan	190	231
Total loans	$ 271,108	$ 346,899
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)	67.50%	63.60%
Consumer | NTM Loans | First lien | Less than 61 | Negative amortization
Financing Receivable, Credit Quality Indicator [Line Items]
Count | loan	8	9
Total loans	$ 2,288	$ 3,027
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	97	148
Total loans	$ 131,922	$ 192,195
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)	30.30%	32.10%
Consumer | NTM Loans | First lien | 61-80 | Green Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Count | loan	6	12
Total loans	$ 5,641	$ 8,531
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)	17.90%	17.10%
Consumer | NTM Loans | First lien | 61-80 | Interest Only
Financing Receivable, Credit Quality Indicator [Line Items]
Count | loan	91	136
Total loans	$ 126,281	$ 183,664
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)	31.40%	33.70%
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	2	9
Total loans	$ 4,251	$ 10,705
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)	1.00%	1.80%
Consumer | NTM Loans | First lien | 81-100 | Green Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Count | loan	0	3
Total loans	$ 0	$ 3,624
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)	0.00%	7.30%
Consumer | NTM Loans | First lien | 81-100 | Interest Only
Financing Receivable, Credit Quality Indicator [Line Items]
Count | loan	2	6
Total loans	$ 4,251	$ 7,081
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)	1.10%	1.30%
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	0	3
Total loans	$ 0	$ 7,727
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)	0.00%	1.30%
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	0	3
Total loans	$ 0	$ 7,727
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)	0.00%	1.40%
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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