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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, 2015 USD ($) Loan	Jun. 30, 2015 USD ($) Loan	Dec. 31, 2014 USD ($) Loan	Jun. 30, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	$ 4,473,095	$ 4,473,095	$ 3,949,122	$ 2,602,213
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]
Count | Loan		686	407
Amount	720,321	$ 720,321	$ 350,575
Non-Traditional Mortgages (NTM) | 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) | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage		16.10%	8.90%
Non-Traditional Mortgages (NTM) | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	122,700	$ 122,700	$ 128,200
Non-Traditional Mortgages (NTM) | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	585,600	585,600	209,300
Non-Traditional Mortgages (NTM) | Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount	12,100	$ 12,100	$ 13,100
Non-Traditional Mortgages (NTM) | First lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan		668	387
Amount	$ 715,435	$ 715,435	$ 345,483
Non-Traditional Mortgages (NTM) | First lien | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage		99.20%	98.50%
Non-Traditional Mortgages (NTM) | First lien | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	143	143	148
Amount	$ 117,881	$ 117,881	$ 123,177
Non-Traditional Mortgages (NTM) | First lien | Green Loans | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage		16.30%	35.10%
Non-Traditional Mortgages (NTM) | First lien | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan		494	207
Amount	585,437	$ 585,437	$ 209,207
Non-Traditional Mortgages (NTM) | First lien | Interest Only Loans | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage		81.20%	59.70%
Non-Traditional Mortgages (NTM) | First lien | Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan		31	32
Amount	12,117	$ 12,117	$ 13,099
Non-Traditional Mortgages (NTM) | First lien | Negative amortization | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage		1.70%	3.70%
Non-Traditional Mortgages (NTM) | Second lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan		18	20
Amount	4,886	$ 4,886	$ 5,092
Non-Traditional Mortgages (NTM) | Second lien | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage		0.80%	1.50%
Non-Traditional Mortgages (NTM) | Second lien | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan		17	19
Amount	4,773	$ 4,773	$ 4,979
Non-Traditional Mortgages (NTM) | Second lien | Green Loans | Nontraditional Mortgage Loans Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage		0.70%	1.40%
Non-Traditional Mortgages (NTM) | Second lien | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan		1	1
Amount	$ 113	$ 113	$ 113
Non-Traditional Mortgages (NTM) | Second lien | 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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