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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Non Traditional Mortgage Performance by Credit Score (Detail) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($) Loan	Dec. 31, 2016 USD ($) Loan	Jun. 30, 2016 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 5,956,337	$ 6,034,752	$ 6,236,115
Non-Traditional Mortgages (NTM)
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 773,037	$ 885,148
Consumer | Non-Traditional Mortgages (NTM)
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	557	663
Loans	$ 773,037	$ 885,148
Amount change	$ (112,100)
Percent Change	(12.70%)
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	545	651
Loans	$ 769,495	$ 881,589
Consumer | Non-Traditional Mortgages (NTM) | Green Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 86,000	$ 91,000
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	102	107
Loans	$ 82,497	$ 87,469
Count Change | Loan	0
Amount change	$ 0
Percent Change	0.00%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | 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 (NTM) | Green Loans | Green Loans (HELOC) - first liens | Greater than 800
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	13	16
Loans	$ 8,737	$ 9,258
Count Change | Loan	(3)
Amount change	$ (521)
Percent Change	(0.60%)
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | 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	10.60%	11.20%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | 700-799
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	56	50
Loans	$ 41,588	$ 38,702
Count Change | Loan	6
Amount change	$ 2,886
Percent Change	3.50%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | 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	50.40%	46.90%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | 600-699
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	24	28
Loans	$ 23,343	$ 27,330
Count Change | Loan	(4)
Amount change	$ (3,987)
Percent Change	(4.80%)
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | 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	28.30%	33.10%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | Less than 600
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	2	1
Loans	$ 3,422	$ 1,800
Count Change | Loan	1
Amount change	$ 1,622
Percent Change	1.90%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | 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	4.10%	2.20%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | No FICO
Financing Receivable, Recorded Investment [Line Items]
Count | Loan	7	7
Loans	$ 5,407	$ 5,407
Count Change | Loan	0
Amount change	$ 0
Percent Change	0.00%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans | Green Loans (HELOC) - first liens | 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	6.60%	6.60%

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