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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgage Performance by Credit Score (Detail) $ in Thousands				9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) Loan	Jun. 30, 2015 Loan	Dec. 31, 2014 USD ($) Loan	Sep. 30, 2015 USD ($) Loan	Dec. 31, 2014 USD ($) Loan	Sep. 30, 2014 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Amount	$ 4,730,077		$ 3,949,122	$ 4,730,077	$ 3,949,122	$ 2,712,068
Non-Traditional Mortgages (NTM)
Financing Receivable, Recorded Investment [Line Items]
Count | Loan				692	407
Amount	759,278		350,575	$ 759,278	$ 350,575
Amount change				$ 408,700
Percent Change				116.60%
Non-Traditional Mortgages (NTM) | First lien
Financing Receivable, Recorded Investment [Line Items]
Count | Loan				675	387
Amount	754,484		345,483	$ 754,484	$ 345,483
Non-Traditional Mortgages (NTM) | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Amount	$ 116,800		128,200	$ 116,800	$ 128,200
Non-Traditional Mortgages (NTM) | Green Loans | First lien
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	135	135		135	148
Amount	$ 112,074		$ 123,177	$ 112,074	$ 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%	100.00%
Non-Traditional Mortgages (NTM) | Green Loans | First lien | Greater than 800
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	23		28
Amount	$ 15,178		$ 19,338	15,178	19,338
Count Change | Loan	(5)
Amount change	$ (4,160)
Percent Change	(3.80%)
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	13.50%		17.30%
Non-Traditional Mortgages (NTM) | Green Loans | First lien | 700-799
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	69		65
Amount	$ 54,896		$ 47,770	54,896	47,770
Count Change | Loan	4
Amount change	$ 7,126
Percent Change	6.50%
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	49.00%		42.50%
Non-Traditional Mortgages (NTM) | Green Loans | First lien | 600-699
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	25		26
Amount	$ 18,198		$ 27,575	18,198	27,575
Count Change | Loan	(1)
Amount change	$ (9,377)
Percent Change	(8.40%)
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	16.20%		24.60%
Non-Traditional Mortgages (NTM) | Green Loans | First lien | Less than 600
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	7		8
Amount	$ 7,815		$ 11,836	7,815	11,836
Count Change | Loan	(1)
Amount change	$ (4,021)
Percent Change	(3.60%)
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	7.00%		10.60%
Non-Traditional Mortgages (NTM) | Green Loans | First lien | No FICO
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	11		8
Amount	$ 15,987		$ 5,555	$ 15,987	$ 5,555
Count Change | Loan	3
Amount change	$ 10,432
Percent Change	9.30%
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	14.30%		5.00%

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