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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			9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) Loan	Jun. 30, 2015 Loan	Sep. 30, 2015 USD ($) Loan	Dec. 31, 2014 USD ($) Loan	Sep. 30, 2014 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Amount	$ 4,730,077		$ 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		$ 759,278	$ 350,575
Non-Traditional Mortgages (NTM) | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Amount	116,800		116,800	128,200
Non-Traditional Mortgages (NTM) | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Amount	630,500		630,500	209,300
Non-Traditional Mortgages (NTM) | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Amount	12,000		$ 12,000	$ 13,100
Non-Traditional Mortgages (NTM) | First lien
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			675	387
Amount	$ 754,484		$ 754,484	$ 345,483
Non-Traditional Mortgages (NTM) | 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%
Non-Traditional Mortgages (NTM) | First lien | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	135	135	135	148
Amount	$ 112,074		$ 112,074	$ 123,177
Non-Traditional Mortgages (NTM) | First lien | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			100.00%	100.00%
Non-Traditional Mortgages (NTM) | First lien | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			509	207
Amount	630,420		$ 630,420	$ 209,207
Non-Traditional Mortgages (NTM) | 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%
Non-Traditional Mortgages (NTM) | First lien | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			31	32
Amount	11,990		$ 11,990	$ 13,099
Non-Traditional Mortgages (NTM) | 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%
Non-Traditional Mortgages (NTM) | First lien | Less than 61
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			203	152
Amount	233,143		$ 233,143	$ 158,133
Non-Traditional Mortgages (NTM) | First lien | Less than 61 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			30.80%	45.80%
Non-Traditional Mortgages (NTM) | First lien | Less than 61 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			57	77
Amount	32,541		$ 32,541	$ 58,856
Non-Traditional Mortgages (NTM) | First lien | Less than 61 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			29.00%	47.80%
Non-Traditional Mortgages (NTM) | First lien | Less than 61 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			129	60
Amount	195,272		$ 195,272	$ 93,254
Non-Traditional Mortgages (NTM) | 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			31.00%	44.70%
Non-Traditional Mortgages (NTM) | First lien | Less than 61 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			17	15
Amount	5,330		$ 5,330	$ 6,023
Non-Traditional Mortgages (NTM) | First lien | Less than 61 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			44.50%	46.00%
Non-Traditional Mortgages (NTM) | First lien | 61-80
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			345	111
Amount	447,116		$ 447,116	$ 133,550
Non-Traditional Mortgages (NTM) | First lien | 61-80 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			59.30%	38.60%
Non-Traditional Mortgages (NTM) | First lien | 61-80 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			43	45
Amount	39,210		$ 39,210	$ 46,177
Non-Traditional Mortgages (NTM) | First lien | 61-80 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			35.00%	37.50%
Non-Traditional Mortgages (NTM) | First lien | 61-80 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			292	54
Amount	402,223		$ 402,223	$ 81,472
Non-Traditional Mortgages (NTM) | First lien | 61-80 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			63.80%	38.90%
Non-Traditional Mortgages (NTM) | First lien | 61-80 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			10	12
Amount	5,683		$ 5,683	$ 5,901
Non-Traditional Mortgages (NTM) | First lien | 61-80 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			47.40%	45.00%
Non-Traditional Mortgages (NTM) | First lien | 81-100
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			56	55
Amount	33,057		$ 33,057	$ 27,554
Non-Traditional Mortgages (NTM) | First lien | 81-100 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			4.40%	8.00%
Non-Traditional Mortgages (NTM) | First lien | 81-100 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			19	18
Amount	16,839		$ 16,839	$ 11,846
Non-Traditional Mortgages (NTM) | First lien | 81-100 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			15.00%	9.60%
Non-Traditional Mortgages (NTM) | First lien | 81-100 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			33	33
Amount	15,241		$ 15,241	$ 14,927
Non-Traditional Mortgages (NTM) | First lien | 81-100 | Interest Only Loans | Loan Portfolio Concentration Risk | Interest Only Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			2.40%	7.10%
Non-Traditional Mortgages (NTM) | First lien | 81-100 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			4	4
Amount	977		$ 977	$ 781
Non-Traditional Mortgages (NTM) | First lien | 81-100 | Negative amortization | Loan Portfolio Concentration Risk | Negative Amortization Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			8.10%	6.00%
Non-Traditional Mortgages (NTM) | First lien | Greater than 100
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			71	69
Amount	41,168		$ 41,168	$ 26,246
Non-Traditional Mortgages (NTM) | First lien | Greater than 100 | Loan Portfolio Concentration Risk | Nontraditional First Lien Mortgage Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			5.50%	7.60%
Non-Traditional Mortgages (NTM) | First lien | Greater than 100 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			16	8
Amount	23,484		$ 23,484	$ 6,298
Non-Traditional Mortgages (NTM) | First lien | Greater than 100 | Green Loans | Loan Portfolio Concentration Risk | Green Loans Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			21.00%	5.10%
Non-Traditional Mortgages (NTM) | First lien | Greater than 100 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			55	60
Amount	17,684		$ 17,684	$ 19,554
Non-Traditional Mortgages (NTM) | 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			2.80%	9.30%
Non-Traditional Mortgages (NTM) | First lien | Greater than 100 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan			0	1
Amount	$ 0		$ 0	$ 394
Non-Traditional Mortgages (NTM) | 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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-Publisher FASB



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