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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Loans and Leases Sold and Purchased (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Purchases | $ 0 | $ 91,247 | $ 176,531
Sales | 0 | (169,154) | (412,094)
Commercial | Multifamily |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Purchases | 0 | 0 | 0
Sales | 0 | 0 | (242,580)
Commercial | SBA |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Purchases | 0 | 0 | 0
Sales | 0 | 0 | (3,599)
Commercial | Lease financing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Purchases | 0 | 91,247 | 127,043
Sales | 0 | (19,741) | 0
Consumer | Single family residential mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Purchases | 0 | 0 | 49,488
Sales | $ 0 | $ (149,413) | $ (165,915)

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- Definition The amount of any significant purchases of financing receivables during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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