LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgage Performance by Credit Score (Detail) $ in Thousands		12 Months Ended
	Dec. 31, 2015 USD ($) Loan	Dec. 31, 2015 USD ($) Loan	Dec. 31, 2014 USD ($) Loan
Financing Receivable, Recorded Investment [Line Items]
Amount	$ 5,184,394	$ 5,184,394	$ 3,949,122
Non-Traditional Mortgages
Financing Receivable, Recorded Investment [Line Items]
Amount	785,908	$ 785,908	$ 350,575
Consumer \| Non-Traditional Mortgages
Financing Receivable, Recorded Investment [Line Items]
Count \| Loan		689	407
Amount	785,908	$ 785,908	$ 350,575
Amount change		$ 435,300
Percent Change		124.20%
Consumer \| Non-Traditional Mortgages \| First lien
Financing Receivable, Recorded Investment [Line Items]
Count \| Loan		672	387
Amount	781,091	$ 781,091	$ 345,483
Consumer \| Non-Traditional Mortgages \| Green Loans
Financing Receivable, Recorded Investment [Line Items]
Amount	109,800	$ 109,800	$ 128,200
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien
Financing Receivable, Recorded Investment [Line Items]
Count \| Loan		121	148
Amount	$ 105,131	$ 105,131	$ 123,177
Count Change \| Loan	0
Amount change	$ 0
Percent Change	0.00%
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| By FICO Scores Obtained During the Quarter Ended December 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Count \| Loan		121
Amount	$ 105,131	$ 105,131
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| By FICO Scores Obtained During the Quarter Ended December 31, 2015 \| 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%
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| By FICO Scores Obtained During the Quarter Ended December 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Count \| Loan			121
Amount			$ 105,131
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| By FICO Scores Obtained During the Quarter Ended December 31, 2014 \| 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%
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| Greater than 800
Financing Receivable, Recorded Investment [Line Items]
Count Change \| Loan	(2)
Amount change	$ (2,149)
Percent Change	(2.10%)
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| Greater than 800 \| By FICO Scores Obtained During the Quarter Ended December 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Count \| Loan		22
Amount	$ 14,438	$ 14,438
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| Greater than 800 \| By FICO Scores Obtained During the Quarter Ended December 31, 2015 \| Loan Portfolio Concentration Risk \| Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage		13.70%
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| Greater than 800 \| By FICO Scores Obtained During the Quarter Ended December 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Count \| Loan			24
Amount			$ 16,587
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| Greater than 800 \| By FICO Scores Obtained During the Quarter Ended December 31, 2014 \| Loan Portfolio Concentration Risk \| Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			15.80%
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| 700-799
Financing Receivable, Recorded Investment [Line Items]
Count Change \| Loan	2
Amount change	$ 4,097
Percent Change	4.00%
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| 700-799 \| By FICO Scores Obtained During the Quarter Ended December 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Count \| Loan		60
Amount	$ 48,775	$ 48,775
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| 700-799 \| By FICO Scores Obtained During the Quarter Ended December 31, 2015 \| Loan Portfolio Concentration Risk \| Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage		46.50%
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| 700-799 \| By FICO Scores Obtained During the Quarter Ended December 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Count \| Loan			58
Amount			$ 44,678
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| 700-799 \| By FICO Scores Obtained During the Quarter Ended December 31, 2014 \| Loan Portfolio Concentration Risk \| Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			42.50%
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| 600-699
Financing Receivable, Recorded Investment [Line Items]
Count Change \| Loan	(1)
Amount change	$ (3,168)
Percent Change	(3.10%)
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| 600-699 \| By FICO Scores Obtained During the Quarter Ended December 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Count \| Loan		23
Amount	$ 23,600	$ 23,600
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| 600-699 \| By FICO Scores Obtained During the Quarter Ended December 31, 2015 \| Loan Portfolio Concentration Risk \| Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage		22.40%
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| 600-699 \| By FICO Scores Obtained During the Quarter Ended December 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Count \| Loan			24
Amount			$ 26,768
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| 600-699 \| By FICO Scores Obtained During the Quarter Ended December 31, 2014 \| Loan Portfolio Concentration Risk \| Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			25.50%
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| Less than 600
Financing Receivable, Recorded Investment [Line Items]
Count Change \| Loan	(3)
Amount change	$ (7,787)
Percent Change	(7.40%)
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| Less than 600 \| By FICO Scores Obtained During the Quarter Ended December 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Count \| Loan		5
Amount	$ 4,030	$ 4,030
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| Less than 600 \| By FICO Scores Obtained During the Quarter Ended December 31, 2015 \| Loan Portfolio Concentration Risk \| Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage		3.80%
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| Less than 600 \| By FICO Scores Obtained During the Quarter Ended December 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Count \| Loan			8
Amount			$ 11,817
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| Less than 600 \| By FICO Scores Obtained During the Quarter Ended December 31, 2014 \| Loan Portfolio Concentration Risk \| Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			11.20%
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| No FICO
Financing Receivable, Recorded Investment [Line Items]
Count Change \| Loan	4
Amount change	$ 9,007
Percent Change	8.60%
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| No FICO \| By FICO Scores Obtained During the Quarter Ended December 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Count \| Loan		11
Amount	$ 14,288	$ 14,288
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| No FICO \| By FICO Scores Obtained During the Quarter Ended December 31, 2015 \| Loan Portfolio Concentration Risk \| Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage		13.60%
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| No FICO \| By FICO Scores Obtained During the Quarter Ended December 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Count \| Loan			7
Amount			$ 5,281
Consumer \| Non-Traditional Mortgages \| Green Loans \| First lien \| No FICO \| By FICO Scores Obtained During the Quarter Ended December 31, 2014 \| Loan Portfolio Concentration Risk \| Non-Traditional Single Family Residential Mortgage Green Loans First Lien Portfolio
Financing Receivable, Recorded Investment [Line Items]
Concentration risk percentage			5.00%