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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, 2015 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	$ 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	$ 720,321	$ 350,575
Non-Traditional Mortgages (NTM) | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Amount	122,700	122,700	128,200
Non-Traditional Mortgages (NTM) | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Amount	585,600	585,600	209,300
Non-Traditional Mortgages (NTM) | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Amount	12,100	$ 12,100	$ 13,100
Non-Traditional Mortgages (NTM) | First lien
Financing Receivable, Recorded Investment [Line Items]
Count | Loan		668	387
Amount	$ 715,435	$ 715,435	$ 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	143	143	148
Amount	$ 117,881	$ 117,881	$ 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		494	207
Amount	585,437	$ 585,437	$ 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	12,117	$ 12,117	$ 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		218	152
Amount	238,046	$ 238,046	$ 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		33.20%	45.80%
Non-Traditional Mortgages (NTM) | First lien | Less than 61 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan		82	77
Amount	58,054	$ 58,054	$ 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		49.20%	47.80%
Non-Traditional Mortgages (NTM) | First lien | Less than 61 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan		120	60
Amount	173,343	$ 173,343	$ 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		29.60%	44.70%
Non-Traditional Mortgages (NTM) | First lien | Less than 61 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan		16	15
Amount	6,649	$ 6,649	$ 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		54.90%	46.00%
Non-Traditional Mortgages (NTM) | First lien | 61-80
Financing Receivable, Recorded Investment [Line Items]
Count | Loan		324	111
Amount	423,977	$ 423,977	$ 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		36	45
Amount	42,145	$ 42,145	$ 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		35.80%	37.50%
Non-Traditional Mortgages (NTM) | First lien | 61-80 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan		277	54
Amount	377,324	$ 377,324	$ 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		64.50%	38.90%
Non-Traditional Mortgages (NTM) | First lien | 61-80 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan		11	12
Amount	4,508	$ 4,508	$ 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		37.20%	45.00%
Non-Traditional Mortgages (NTM) | First lien | 81-100
Financing Receivable, Recorded Investment [Line Items]
Count | Loan		60	55
Amount	29,187	$ 29,187	$ 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		4.10%	8.00%
Non-Traditional Mortgages (NTM) | First lien | 81-100 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan		19	18
Amount	12,519	$ 12,519	$ 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		10.60%	9.60%
Non-Traditional Mortgages (NTM) | First lien | 81-100 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan		38	33
Amount	16,094	$ 16,094	$ 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		2.70%	7.10%
Non-Traditional Mortgages (NTM) | First lien | 81-100 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan		3	4
Amount	574	$ 574	$ 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		4.70%	6.00%
Non-Traditional Mortgages (NTM) | First lien | Greater than 100
Financing Receivable, Recorded Investment [Line Items]
Count | Loan		66	69
Amount	24,225	$ 24,225	$ 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		3.40%	7.60%
Non-Traditional Mortgages (NTM) | First lien | Greater than 100 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan		6	8
Amount	5,163	$ 5,163	$ 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		4.40%	5.10%
Non-Traditional Mortgages (NTM) | First lien | Greater than 100 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan		59	60
Amount	18,676	$ 18,676	$ 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		3.20%	9.30%
Non-Traditional Mortgages (NTM) | First lien | Greater than 100 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan		1	1
Amount	$ 386	$ 386	$ 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		3.20%	3.00%

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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