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LOANS AND ALLOWANCE FOR LOAN LOSSES - Non Traditional Mortgages Portfolio (Detail) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan	Sep. 30, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 6,383,259	$ 7,700,873	$ 7,253,293
NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 6,383,259	$ 7,700,873
Consumer | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	501	628
Total loans	$ 653,475	$ 826,731
Consumer | NTM Loans | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage (percent)	100.00%	100.00%
Consumer | NTM Loans | Loan Portfolio Concentration Risk | Loan Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage (percent)	10.20%	10.70%
Consumer | NTM Loans | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 588,600	$ 753,100
Consumer | NTM Loans | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	494	618
Total loans	$ 651,167	$ 824,318
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage (percent)	99.60%	99.70%
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	76	88
Total loans	$ 59,538	$ 67,729
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Green Loans | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage (percent)	9.10%	8.20%
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	409	519
Total loans	$ 588,567	$ 753,061
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Interest Only Loans | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage (percent)	90.10%	91.10%
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	9	11
Total loans	$ 3,062	$ 3,528
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Negative amortization | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage (percent)	0.50%	0.40%
Consumer | NTM Loans | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	7	10
Total loans	$ 2,308	$ 2,413
Consumer | NTM Loans | Green Loans (HELOC) - second liens | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage (percent)	0.40%	0.30%
Consumer | NTM Loans | Green Loans (HELOC) - second liens | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	7	10
Total loans	$ 2,308	$ 2,413
Consumer | NTM Loans | Green Loans (HELOC) - second liens | Green Loans | Loan Portfolio Concentration Risk | Nontraditional Mortgage Loans Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage (percent)	0.40%	0.30%

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

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