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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgage Performance Loan to Value Ratio (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Loan	Dec. 31, 2016 USD ($) Loan
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	$ 6,659,407	$ 6,034,752
NTM Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	$ 806,933	$ 885,148
Consumer | NTM Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	592	663
Total loans and leases	$ 806,933	$ 885,148
Consumer | NTM Loans | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	85,800	91,000
Consumer | NTM Loans | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	717,500	784,400
Consumer | NTM Loans | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	$ 3,700	$ 9,800
Consumer | NTM Loans | First lien
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	580	651
Total loans and leases	$ 803,355	$ 881,589
Consumer | NTM Loans | First lien | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	100.00%	100.00%
Consumer | NTM Loans | First lien | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	101	107
Total loans and leases	$ 82,197	$ 87,469
Consumer | NTM Loans | First lien | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	100.00%	100.00%
Consumer | NTM Loans | First lien | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	468	522
Total loans and leases	$ 717,484	$ 784,364
Consumer | NTM Loans | First lien | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	100.00%	100.00%
Consumer | NTM Loans | First lien | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	11	22
Total loans and leases	$ 3,674	$ 9,756
Consumer | NTM Loans | First lien | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	100.00%	100.00%
Consumer | NTM Loans | First lien | Less than 61
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	311	257
Total loans and leases	$ 461,877	$ 382,892
Consumer | NTM Loans | First lien | Less than 61 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	57.50%	43.40%
Consumer | NTM Loans | First lien | Less than 61 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	60	45
Total loans and leases	$ 51,241	$ 39,105
Consumer | NTM Loans | First lien | Less than 61 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	62.30%	44.70%
Consumer | NTM Loans | First lien | Less than 61 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	242	196
Total loans and leases	$ 407,810	$ 336,744
Consumer | NTM Loans | First lien | Less than 61 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	56.80%	42.90%
Consumer | NTM Loans | First lien | Less than 61 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	9	16
Total loans and leases	$ 2,826	$ 7,043
Consumer | NTM Loans | First lien | Less than 61 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	76.90%	72.20%
Consumer | NTM Loans | First lien | 61-80
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	255	364
Total loans and leases	$ 326,420	$ 478,714
Consumer | NTM Loans | First lien | 61-80 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	40.60%	54.30%
Consumer | NTM Loans | First lien | 61-80 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	33	52
Total loans and leases	$ 25,072	$ 41,732
Consumer | NTM Loans | First lien | 61-80 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	30.50%	47.70%
Consumer | NTM Loans | First lien | 61-80 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	220	306
Total loans and leases	$ 300,500	$ 434,269
Consumer | NTM Loans | First lien | 61-80 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	41.90%	55.40%
Consumer | NTM Loans | First lien | 61-80 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	2	6
Total loans and leases	$ 848	$ 2,713
Consumer | NTM Loans | First lien | 61-80 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	23.10%	27.80%
Consumer | NTM Loans | First lien | 81-100
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	14	18
Total loans and leases	$ 15,058	$ 15,460
Consumer | NTM Loans | First lien | 81-100 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	1.90%	1.80%
Consumer | NTM Loans | First lien | 81-100 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	8	10
Total loans and leases	$ 5,884	$ 6,632
Consumer | NTM Loans | First lien | 81-100 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	7.20%	7.60%
Consumer | NTM Loans | First lien | 81-100 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	6	8
Total loans and leases	$ 9,174	$ 8,828
Consumer | NTM Loans | First lien | 81-100 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	1.30%	1.10%
Consumer | NTM Loans | First lien | 81-100 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	0	0
Total loans and leases	$ 0	$ 0
Consumer | NTM Loans | First lien | 81-100 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	0.00%	0.00%
Consumer | NTM Loans | First lien | Greater than 100
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	0	12
Total loans and leases	$ 0	$ 4,523
Consumer | NTM Loans | First lien | Greater than 100 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	0.00%	0.50%
Consumer | NTM Loans | First lien | Greater than 100 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	0	0
Total loans and leases	$ 0	$ 0
Consumer | NTM Loans | First lien | Greater than 100 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	0.00%	0.00%
Consumer | NTM Loans | First lien | Greater than 100 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	0	12
Total loans and leases	$ 0	$ 4,523
Consumer | NTM Loans | First lien | Greater than 100 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	0.00%	0.60%
Consumer | NTM Loans | First lien | Greater than 100 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	0	0
Total loans and leases	$ 0	$ 0
Consumer | NTM Loans | First lien | Greater than 100 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Percentage to total loans and leases	0.00%	0.00%

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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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