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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	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
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) | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Gross loans	682,000	664,500	664,500
Consumer | Non-Traditional Mortgages (NTM) | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Gross loans	$ 11,300	11,600	$ 11,600
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) | 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%
Consumer | Non-Traditional Mortgages (NTM) | First lien | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	119	121	121
Gross loans	$ 102,130	$ 105,131	$ 105,131
Consumer | 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%
Consumer | Non-Traditional Mortgages (NTM) | First lien | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	526		521
Gross loans	$ 681,870	664,358	$ 664,358
Consumer | 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%
Consumer | Non-Traditional Mortgages (NTM) | First lien | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	29		30
Gross loans	$ 11,320	11,602	$ 11,602
Consumer | 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%
Consumer | Non-Traditional Mortgages (NTM) | First lien | Less than 61
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	221		228
Gross loans	$ 266,694	264,612	$ 264,612
Consumer | 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	33.50%		33.90%
Consumer | Non-Traditional Mortgages (NTM) | First lien | Less than 61 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	66		70
Gross loans	$ 47,383	51,221	$ 51,221
Consumer | 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	46.40%		48.70%
Consumer | Non-Traditional Mortgages (NTM) | First lien | Less than 61 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	142		141
Gross loans	$ 216,466	208,120	$ 208,120
Consumer | 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	31.70%		31.30%
Consumer | Non-Traditional Mortgages (NTM) | First lien | Less than 61 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	13		17
Gross loans	$ 2,845	5,271	$ 5,271
Consumer | 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	25.10%		45.40%
Consumer | Non-Traditional Mortgages (NTM) | First lien | 61-80
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	374		336
Gross loans	$ 494,236	456,843	$ 456,843
Consumer | 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	62.10%		58.40%
Consumer | Non-Traditional Mortgages (NTM) | First lien | 61-80 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	37		33
Gross loans	$ 44,214	42,075	$ 42,075
Consumer | 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	43.30%		40.00%
Consumer | Non-Traditional Mortgages (NTM) | First lien | 61-80 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	322		291
Gross loans	$ 441,770	408,662	$ 408,662
Consumer | 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	64.80%		61.60%
Consumer | Non-Traditional Mortgages (NTM) | First lien | 61-80 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	15		12
Gross loans	$ 8,252	6,106	$ 6,106
Consumer | 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	72.90%		52.70%
Consumer | Non-Traditional Mortgages (NTM) | First lien | 81-100
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	38		50
Gross loans	$ 17,236	37,228	$ 37,228
Consumer | 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	2.20%		4.80%
Consumer | Non-Traditional Mortgages (NTM) | First lien | 81-100 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	11		12
Gross loans	$ 6,220	6,836	$ 6,836
Consumer | 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	6.10%		6.50%
Consumer | Non-Traditional Mortgages (NTM) | First lien | 81-100 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	26		37
Gross loans	$ 10,793	30,167	$ 30,167
Consumer | 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	1.60%		4.50%
Consumer | Non-Traditional Mortgages (NTM) | First lien | 81-100 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	1		1
Gross loans	$ 223	225	$ 225
Consumer | 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	2.00%		1.90%
Consumer | Non-Traditional Mortgages (NTM) | First lien | Greater than 100
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	41		58
Gross loans	$ 17,154	22,408	$ 22,408
Consumer | 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	2.20%		2.90%
Consumer | Non-Traditional Mortgages (NTM) | First lien | Greater than 100 | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	5		6
Gross loans	$ 4,313	4,999	$ 4,999
Consumer | 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	4.20%		4.80%
Consumer | Non-Traditional Mortgages (NTM) | First lien | Greater than 100 | Interest Only Loans
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	36		52
Gross loans	$ 12,841	17,409	$ 17,409
Consumer | 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	1.90%		2.60%
Consumer | Non-Traditional Mortgages (NTM) | First lien | Greater than 100 | Negative amortization
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	0		0
Gross loans	$ 0	$ 0	$ 0
Consumer | 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%		0.00%

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+ References

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