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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgages Portfolio (Detail) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) Loan	Dec. 31, 2015 USD ($) Loan	Dec. 31, 2015 USD ($) Loan	Mar. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 5,463,068	$ 5,184,394	$ 5,184,394	$ 3,933,715
Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	100.00%		100.00%
Non-Traditional Mortgages (NTM)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 799,801	785,908	$ 785,908
Non-Traditional Mortgages (NTM) | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	14.60%		15.20%
Non-Traditional Mortgages (NTM) | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	690		689
Gross loans	$ 799,801	785,908	$ 785,908
Non-Traditional Mortgages (NTM) | Consumer | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	100.00%		100.00%
Non-Traditional Mortgages (NTM) | Consumer | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	14.60%		15.20%
Non-Traditional Mortgages (NTM) | Consumer | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 106,500	109,800	$ 109,800
Non-Traditional Mortgages (NTM) | Consumer | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	682,000	664,500	664,500
Non-Traditional Mortgages (NTM) | Consumer | Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 11,300	11,600	$ 11,600
Non-Traditional Mortgages (NTM) | Consumer | First lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	674		672
Gross loans	$ 795,320	$ 781,091	$ 781,091
Non-Traditional Mortgages (NTM) | Consumer | First lien | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	99.40%		99.30%
Non-Traditional Mortgages (NTM) | Consumer | First lien | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	119	121	121
Gross loans	$ 102,130	$ 105,131	$ 105,131
Non-Traditional Mortgages (NTM) | Consumer | First lien | Green Loans | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	12.80%		13.40%
Non-Traditional Mortgages (NTM) | Consumer | First lien | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	526		521
Gross loans	$ 681,870	664,358	$ 664,358
Non-Traditional Mortgages (NTM) | Consumer | First lien | Interest Only Loans | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	85.20%		84.40%
Non-Traditional Mortgages (NTM) | Consumer | First lien | Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	29		30
Gross loans	$ 11,320	11,602	$ 11,602
Non-Traditional Mortgages (NTM) | Consumer | First lien | Negative amortization | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	1.40%		1.50%
Non-Traditional Mortgages (NTM) | Consumer | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	16		17
Gross loans	$ 4,481	4,817	$ 4,817
Non-Traditional Mortgages (NTM) | Consumer | Green Loans (HELOC) - second liens | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	0.60%		0.70%
Non-Traditional Mortgages (NTM) | Consumer | Green Loans (HELOC) - second liens | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	15		16
Gross loans	$ 4,368	4,704	$ 4,704
Non-Traditional Mortgages (NTM) | Consumer | Green Loans (HELOC) - second liens | Green Loans | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	0.50%		0.60%
Non-Traditional Mortgages (NTM) | Consumer | Green Loans (HELOC) - second liens | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	1		1
Gross loans	$ 113	$ 113	$ 113
Non-Traditional Mortgages (NTM) | Consumer | Green Loans (HELOC) - second liens | Interest Only Loans | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	0.10%		0.10%

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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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