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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgage Performance by Credit Score (Detail) $ in Thousands			6 Months Ended	12 Months Ended
	Jun. 30, 2015 USD ($) Loan	Dec. 31, 2014 USD ($) Loan	Jun. 30, 2015 USD ($) Loan	Dec. 31, 2014 USD ($) Loan	Jun. 30, 2014 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Amount	$ 4,473,095	$ 3,949,122	$ 4,473,095	$ 3,949,122	$ 2,602,213
Non-Traditional Mortgages (NTM)
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			686	407
Amount	720,321	350,575	$ 720,321	$ 350,575
Amount change			$ 369,700
Percent Change			105.50%
Non-Traditional Mortgages (NTM) | First lien
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			668	387
Amount	715,435	345,483	$ 715,435	$ 345,483
Non-Traditional Mortgages (NTM) | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Amount	$ 122,700	128,200	$ 122,700	$ 128,200
Non-Traditional Mortgages (NTM) | Green Loans | First lien
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	143		143	148
Amount	$ 117,881	$ 123,177	$ 117,881	$ 123,177
Count Change | Loan	0
Amount change	$ 0
Percent Change	0.00%
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%
Non-Traditional Mortgages (NTM) | Green Loans | First lien | Greater than 800
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	24	28
Amount	$ 15,720	$ 19,274	15,720	19,274
Count Change | Loan	(4)
Amount change	$ (3,554)
Percent Change	(3.10%)
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	13.30%	16.40%
Non-Traditional Mortgages (NTM) | Green Loans | First lien | 700-799
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	74	69
Amount	$ 59,367	$ 49,543	59,367	49,543
Count Change | Loan	5
Amount change	$ 9,824
Percent Change	8.50%
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	50.40%	41.90%
Non-Traditional Mortgages (NTM) | Green Loans | First lien | 600-699
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	26	28
Amount	$ 18,189	$ 30,408	18,189	30,408
Count Change | Loan	(2)
Amount change	$ (12,219)
Percent Change	(10.40%)
Non-Traditional Mortgages (NTM) | Green Loans | First lien | 600-699 | Loan Portfolio Concentration Risk | Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage	15.40%	25.80%
Non-Traditional Mortgages (NTM) | Green Loans | First lien | Less than 600
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	7	8
Amount	$ 7,848	$ 11,867	7,848	11,867
Count Change | Loan	(1)
Amount change	$ (4,019)
Percent Change	(3.40%)
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	6.70%	10.10%
Non-Traditional Mortgages (NTM) | Green Loans | First lien | No FICO
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	12	10
Amount	$ 16,757	$ 6,789	$ 16,757	$ 6,789
Count Change | Loan	2
Amount change	$ 9,968
Percent Change	8.40%
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	14.20%	5.80%

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