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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non Traditional Mortgage Loans Additional Information (Details) $ in Thousands	Mar. 31, 2020 USD ($) portfolio_product	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 5,667,464	$ 5,951,885
NTM Loans | Interest-only
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of interest-only products | portfolio_product	3
Consumer | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 560,058	600,656
Non-performing loans | Consumer | NTM Loans | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,700	1,500
Green Loans (HELOC) - first liens | Consumer | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	558,164	598,357
Green Loans (HELOC) - first liens | Consumer | NTM Loans | Green Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	45,913	49,959
Green Loans (HELOC) - first liens | Consumer | NTM Loans | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	509,892	545,371
Green Loans (HELOC) - first liens | Non-performing loans | Consumer | NTM Loans | Interest Only Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 10,900	$ 11,500

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524

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