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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgages Portfolio (Detail) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($) Loan	Dec. 31, 2016 USD ($) Loan	Jun. 30, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 5,956,337	$ 6,034,752	$ 6,236,115
Non-Traditional Mortgages (NTM)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 773,037	$ 885,148
Consumer | Non-Traditional Mortgages (NTM)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	557	663
Loans	$ 773,037	$ 885,148
Consumer | Non-Traditional Mortgages (NTM) | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	100.00%	100.00%
Consumer | Non-Traditional Mortgages (NTM) | Loan Portfolio Concentration Risk | Loan Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	13.00%	14.70%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 86,000	$ 91,000
Consumer | Non-Traditional Mortgages (NTM) | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	683,200	784,400
Consumer | Non-Traditional Mortgages (NTM) | Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 3,800	$ 9,800
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	545	651
Loans	$ 769,495	$ 881,589
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	99.50%	99.60%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	102	107
Loans	$ 82,497	$ 87,469
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Green Loans | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	10.70%	9.90%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	432	522
Loans	$ 683,246	$ 784,364
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Interest Only Loans | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	88.30%	88.60%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	11	22
Loans	$ 3,752	$ 9,756
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Negative amortization | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	0.50%	1.10%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	12	12
Loans	$ 3,542	$ 3,559
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - second liens | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	0.50%	0.40%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - second liens | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	12	12
Loans	$ 3,542	$ 3,559
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - second liens | Green Loans | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	0.50%	0.40%

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Indicates the number of mortgages under each classification.

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