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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Nonaccrual Loans and Leases Additional Information (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Loans 90 days past due and still accruing	$ 0	$ 0
Loans on non-accrual status	5,667,464,000	5,951,885,000
Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans in process of foreclosure	15,700,000	15,700,000
NTM Loans | Consumer
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	560,058,000	600,656,000
NTM Loans | Green Loans | Non-performing loans | Consumer
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	4,700,000	1,500,000
Green Loans (HELOC) - first liens | NTM Loans | Consumer
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	558,164,000	598,357,000
Green Loans (HELOC) - first liens | NTM Loans | Green Loans | Consumer
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	45,913,000	49,959,000
Green Loans (HELOC) - first liens | NTM Loans | Interest Only Loans | Consumer
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	509,892,000	545,371,000
Green Loans (HELOC) - first liens | NTM Loans | Interest Only Loans | Non-performing loans | Consumer
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	$ 10,900,000	$ 11,500,000

X

- Definition

Amount of financing receivable 90 days or more past due and still accruing.

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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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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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