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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgage Performance Loan to Value Ratio (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Loan	Dec. 31, 2014 USD ($) Loan
Financing Receivable, Recorded Investment [Line Items]
Amount	$ 5,184,394	$ 3,949,122
Non-Traditional Mortgages
Financing Receivable, Recorded Investment [Line Items]
Amount	$ 785,908	$ 350,575
Consumer | Non-Traditional Mortgages
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	689	407
Amount	$ 785,908	$ 350,575
Consumer | Non-Traditional Mortgages | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Amount	109,800	128,200
Consumer | Non-Traditional Mortgages | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Amount	664,500	209,300
Consumer | Non-Traditional Mortgages | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Amount	$ 11,600	$ 13,100
Consumer | Non-Traditional Mortgages | First lien
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	672	387
Amount	$ 781,091	$ 345,483
Consumer | Non-Traditional Mortgages | First lien | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	100.00%	100.00%
Consumer | Non-Traditional Mortgages | First lien | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	121	148
Amount	$ 105,131	$ 123,177
Consumer | Non-Traditional Mortgages | First lien | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	100.00%	100.00%
Consumer | Non-Traditional Mortgages | First lien | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	521	207
Amount	$ 664,358	$ 209,207
Consumer | Non-Traditional Mortgages | First lien | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	100.00%	100.00%
Consumer | Non-Traditional Mortgages | First lien | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	30	32
Amount	$ 11,602	$ 13,099
Consumer | Non-Traditional Mortgages | First lien | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	100.00%	100.00%
Consumer | Non-Traditional Mortgages | First lien | Less than 61
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	228	152
Amount	$ 264,612	$ 158,133
Consumer | Non-Traditional Mortgages | First lien | Less than 61 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	33.90%	45.80%
Consumer | Non-Traditional Mortgages | First lien | Less than 61 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	70	77
Amount	$ 51,221	$ 58,856
Consumer | Non-Traditional Mortgages | First lien | Less than 61 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	48.70%	47.80%
Consumer | Non-Traditional Mortgages | First lien | Less than 61 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	141	60
Amount	$ 208,120	$ 93,254
Consumer | Non-Traditional Mortgages | First lien | Less than 61 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	31.30%	44.70%
Consumer | Non-Traditional Mortgages | First lien | Less than 61 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	17	15
Amount	$ 5,271	$ 6,023
Consumer | Non-Traditional Mortgages | First lien | Less than 61 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	45.40%	46.00%
Consumer | Non-Traditional Mortgages | First lien | 61-80
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	336	111
Amount	$ 456,843	$ 133,550
Consumer | Non-Traditional Mortgages | First lien | 61-80 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	58.40%	38.60%
Consumer | Non-Traditional Mortgages | First lien | 61-80 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	33	45
Amount	$ 42,075	$ 46,177
Consumer | Non-Traditional Mortgages | First lien | 61-80 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	40.00%	37.50%
Consumer | Non-Traditional Mortgages | First lien | 61-80 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	291	54
Amount	$ 408,662	$ 81,472
Consumer | Non-Traditional Mortgages | First lien | 61-80 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	61.60%	38.90%
Consumer | Non-Traditional Mortgages | First lien | 61-80 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	12	12
Amount	$ 6,106	$ 5,901
Consumer | Non-Traditional Mortgages | First lien | 61-80 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	52.70%	45.00%
Consumer | Non-Traditional Mortgages | First lien | 81-100
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	50	55
Amount	$ 37,228	$ 27,554
Consumer | Non-Traditional Mortgages | First lien | 81-100 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	4.80%	8.00%
Consumer | Non-Traditional Mortgages | First lien | 81-100 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	12	18
Amount	$ 6,836	$ 11,846
Consumer | Non-Traditional Mortgages | First lien | 81-100 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	6.50%	9.60%
Consumer | Non-Traditional Mortgages | First lien | 81-100 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	37	33
Amount	$ 30,167	$ 14,927
Consumer | Non-Traditional Mortgages | First lien | 81-100 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	4.50%	7.10%
Consumer | Non-Traditional Mortgages | First lien | 81-100 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	1	4
Amount	$ 225	$ 781
Consumer | Non-Traditional Mortgages | First lien | 81-100 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	1.90%	6.00%
Consumer | Non-Traditional Mortgages | First lien | Greater than 100
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	58	69
Amount	$ 22,408	$ 26,246
Consumer | Non-Traditional Mortgages | First lien | Greater than 100 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	2.90%	7.60%
Consumer | Non-Traditional Mortgages | First lien | Greater than 100 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	6	8
Amount	$ 4,999	$ 6,298
Consumer | Non-Traditional Mortgages | First lien | Greater than 100 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	4.80%	5.10%
Consumer | Non-Traditional Mortgages | First lien | Greater than 100 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	52	60
Amount	$ 17,409	$ 19,554
Consumer | Non-Traditional Mortgages | First lien | Greater than 100 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	2.60%	9.30%
Consumer | Non-Traditional Mortgages | First lien | Greater than 100 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	0	1
Amount	$ 0	$ 394
Consumer | Non-Traditional Mortgages | First lien | Greater than 100 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	0.00%	3.00%

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