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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non Traditional Mortgages Portfolio (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 5,764,401	$ 5,898,405
NTM Loans | Loan Portfolio Concentration Risk | Loan Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage (percent)	7.10%	7.40%
Consumer | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	320	344
Total loans	$ 412,136	$ 437,113
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 | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	315	339
Total loans	$ 410,530	$ 435,515
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%	99.60%
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	46	48
Total loans	$ 30,293	$ 31,587
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)	7.40%	7.20%
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	263	283
Total loans	$ 378,088	$ 401,640
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)	91.70%	91.90%
Consumer | NTM Loans | Green Loans (HELOC) - first liens | Negative amortization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	6	8
Total loans	$ 2,149	$ 2,288
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%	0.50%
Consumer | NTM Loans | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	5	5
Total loans	$ 1,606	$ 1,598
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%	0.40%
Consumer | NTM Loans | Green Loans (HELOC) - second liens | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | loan	5	5
Total loans	$ 1,606	$ 1,598
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%	0.40%

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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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