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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgage Performance by Credit Score (Detail) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) Loan	Dec. 31, 2015 USD ($) Loan	Dec. 31, 2015 USD ($) Loan	Mar. 31, 2015 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Gross loans	$ 5,463,068	$ 5,184,394	$ 5,184,394	$ 3,933,715
Non-Traditional Mortgages (NTM)
Financing Receivable, Recorded Investment [Line Items]
Gross loans	$ 799,801	785,908	$ 785,908
Consumer | Non-Traditional Mortgages (NTM)
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	690		689
Gross loans	$ 799,801	785,908	$ 785,908
Amount change	$ 13,900
Percent Change	1.80%
Consumer | Non-Traditional Mortgages (NTM) | First lien
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	674		672
Gross loans	$ 795,320	781,091	$ 781,091
Consumer | Non-Traditional Mortgages (NTM) | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Gross loans	$ 106,500	$ 109,800	$ 109,800
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	119	121	121
Gross loans	$ 102,130	$ 105,131	$ 105,131
Count Change | Loan	(2)
Amount change	$ (3,001)
Percent Change	0.00%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	100.00%	100.00%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | Greater than 800
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	23	22
Gross loans	$ 15,465	$ 14,438	14,438
Count Change | Loan	1
Amount change	$ 1,027
Percent Change	1.40%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | Greater than 800 | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	15.10%	13.70%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | 700-799
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	56	60
Gross loans	$ 41,702	$ 48,775	48,775
Count Change | Loan	(4)
Amount change	$ (7,073)
Percent Change	(5.70%)
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | 700-799 | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	40.80%	46.50%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | FICO Score, 600 to 699 [Member]
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	23	23
Gross loans	$ 24,901	$ 23,600	23,600
Count Change | Loan	0
Amount change	$ 1,301
Percent Change	2.00%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | FICO Score, 600 to 699 [Member] | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	24.40%	22.40%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | Less than 600
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	5	5
Gross loans	$ 4,860	$ 4,030	4,030
Count Change | Loan	0
Amount change	$ 830
Percent Change	1.00%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | Less than 600 | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	4.80%	3.80%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | No FICO
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	12	11
Gross loans	$ 15,202	$ 14,288	$ 14,288
Count Change | Loan	1
Amount change	$ 914
Percent Change	1.30%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | First lien | No FICO | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	14.90%	13.60%

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