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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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