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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgages Portfolio (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Loan	Dec. 31, 2016 USD ($) Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 6,659,407	$ 6,034,752
Loan Portfolio Concentration Risk | Loan Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage to total loans and leases	100.00%	100.00%
NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 806,933	$ 885,148
NTM Loans | Loan Portfolio Concentration Risk | Loan Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage to total loans and leases	12.10%	14.70%
Consumer | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	592	663
Total loans and leases	$ 806,933	$ 885,148
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	100.00%	100.00%
Consumer | NTM Loans | Loan Portfolio Concentration Risk | Loan Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage to total loans and leases	12.10%	14.70%
Consumer | NTM Loans | First lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	580	651
Total loans and leases	$ 803,355	$ 881,589
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	99.60%	99.60%
Consumer | NTM Loans | Second lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	12	12
Total loans and leases	$ 3,578	$ 3,559
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	0.40%	0.40%
Consumer | NTM Loans | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 85,800	$ 91,000
Consumer | NTM Loans | Green Loans | First lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	101	107
Total loans and leases	$ 82,197	$ 87,469
Consumer | NTM Loans | Green 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	10.20%	9.90%
Consumer | NTM Loans | Green Loans | Second lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	12	12
Total loans and leases	$ 3,578	$ 3,559
Consumer | NTM Loans | Green 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	0.40%	0.40%
Consumer | NTM Loans | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 717,500	$ 784,400
Consumer | NTM Loans | Interest Only Loans | First lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	468	522
Total loans and leases	$ 717,484	$ 784,364
Consumer | NTM Loans | Interest Only 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	88.90%	88.60%
Consumer | NTM Loans | Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 3,700	$ 9,800
Consumer | NTM Loans | Negative amortization | First lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	11	22
Total loans and leases	$ 3,674	$ 9,756
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	0.50%	1.10%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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-Publisher FASB
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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Indicates the number of mortgages under each classification.

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