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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Reclassification Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Transfers from Held-For-Sale | $ 0 | $ 0 | $ 0
Transfers to Held-For-Sale | 0 | (1,139,597) | (376,995)
Commercial | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Transfers from Held-For-Sale | 0 | 0 | 0
Transfers to Held-For-Sale | 0 | 0 | (1,133)
Commercial | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Transfers from Held-For-Sale | 0 | 0 | 0
Transfers to Held-For-Sale | 0 | (573) | 0
Commercial | Multifamily |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Transfers from Held-For-Sale | 0 | 0 | 0
Transfers to Held-For-Sale | 0 | (752,087) | (81,449)
Commercial | SBA |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Transfers from Held-For-Sale | 0 | 0 | 0
Transfers to Held-For-Sale | 0 | (559) | 0
Commercial | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Transfers from Held-For-Sale | 0 | 0 | 0
Transfers to Held-For-Sale | 0 | (2,519) | (434)
Consumer | Single family residential mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Transfers from Held-For-Sale | 0 | 0 | 0
Transfers to Held-For-Sale | 0 | (383,859) | (289,617)
Consumer | Other consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Transfers from Held-For-Sale | 0 | 0 | 0
Transfers to Held-For-Sale | $ 0 | $ 0 | $ (4,362)

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- Definition Amount of financing receivable reclassified to held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919244-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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