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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	6 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($) Loan	Dec. 31, 2015 USD ($) Loan	Jun. 30, 2015 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Gross loans	$ 6,236,115	$ 5,184,394	$ 4,473,095
Non-Traditional Mortgages (NTM)
Financing Receivable, Recorded Investment [Line Items]
Gross loans	$ 842,634	$ 785,908
Consumer | Non-Traditional Mortgages (NTM)
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	699	689
Gross loans	$ 842,634	$ 785,908
Consumer | Non-Traditional Mortgages (NTM) | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Gross loans	103,900	109,800
Consumer | Non-Traditional Mortgages (NTM) | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Gross loans	727,500	664,500
Consumer | Non-Traditional Mortgages (NTM) | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Gross loans	$ 11,200	$ 11,600
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	684	672
Gross loans	$ 838,336	$ 781,091
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 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 (NTM) | Green Loans (HELOC) - first liens | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	116	121
Gross loans	$ 99,620	$ 105,131
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 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 (NTM) | Green Loans (HELOC) - first liens | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	540	521
Gross loans	$ 727,527	$ 664,358
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 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 (NTM) | Green Loans (HELOC) - first liens | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	28	30
Gross loans	$ 11,189	$ 11,602
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 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 (NTM) | Green Loans (HELOC) - first liens | Less than 61
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	258	228
Gross loans	$ 345,385	$ 264,612
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Less than 61 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	41.20%	33.90%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Less than 61 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	56	70
Gross loans	$ 40,480	$ 51,221
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Less than 61 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	40.60%	48.70%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Less than 61 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	183	141
Gross loans	$ 299,757	$ 208,120
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Less than 61 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	41.20%	31.30%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Less than 61 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	19	17
Gross loans	$ 5,148	$ 5,271
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Less than 61 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	46.00%	45.40%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 61-80
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	342	336
Gross loans	$ 450,086	$ 456,843
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 61-80 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	53.70%	58.40%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 61-80 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	41	33
Gross loans	$ 45,248	$ 42,075
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 61-80 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	45.40%	40.00%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 61-80 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	294	291
Gross loans	$ 399,589	$ 408,662
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 61-80 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	55.00%	61.60%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 61-80 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	7	12
Gross loans	$ 5,249	$ 6,106
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 61-80 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	46.90%	52.70%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 81-100
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	47	50
Gross loans	$ 27,583	$ 37,228
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 81-100 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	3.30%	4.80%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 81-100 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	15	12
Gross loans	$ 11,948	$ 6,836
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 81-100 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	12.00%	6.50%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 81-100 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	30	37
Gross loans	$ 14,843	$ 30,167
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 81-100 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	2.00%	4.50%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 81-100 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	2	1
Gross loans	$ 792	$ 225
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | 81-100 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	7.10%	1.90%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Greater than 100
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	37	58
Gross loans	$ 15,282	$ 22,408
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Greater than 100 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	1.80%	2.90%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Greater than 100 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	4	6
Gross loans	$ 1,944	$ 4,999
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Greater than 100 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	2.00%	4.80%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Greater than 100 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	33	52
Gross loans	$ 13,338	$ 17,409
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Greater than 100 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	1.80%	2.60%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Greater than 100 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	0	0
Gross loans	$ 0	$ 0
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens | Greater than 100 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	0.00%	0.00%

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+ References

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