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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Purchases, Sales, and Transfers (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Transfers from Held-For-Sale | $ 0 | $ 0 | $ 0 | $ 0
Transfers (to) Held-For-Sale | (205,278) | (176,689) | (211,824) | (418,976)
Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Transfers from Held-For-Sale |  | 0 |  | 0
Transfers (to) Held-For-Sale |  | (3,924) |  | (3,924)
Commercial | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Transfers from Held-For-Sale |  | 0 |  | 0
Transfers (to) Held-For-Sale |  | (1,329) |  | (1,329)
Commercial | Multifamily |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Transfers from Held-For-Sale | 0 | 0 | 0 | 0
Transfers (to) Held-For-Sale | (71,449) | 0 | (71,449) | (6,583)
Commercial | SBA |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Transfers from Held-For-Sale |  | 0 |  | 0
Transfers (to) Held-For-Sale |  | (1,865) |  | (1,865)
Commercial | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Transfers from Held-For-Sale |  | 0 |  | 0
Transfers (to) Held-For-Sale |  | (1,528) |  | (1,528)
Consumer | Single family residential mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Transfers from Held-For-Sale | 0 | 0 | 0 | 0
Transfers (to) Held-For-Sale | (133,829) | $ (168,043) | (136,013) | $ (403,747)
Consumer | Other consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Transfers from Held-For-Sale | 0 |  | 0 |
Transfers (to) Held-For-Sale | $ 0 |  | $ (4,362) |

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- Definition Financing Receivable, Reclassification From Held-for-sale + References No definition available. + Details
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Namespace Prefix: | banc_
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The amount of financing receivables reclassified to held for sale during the reporting period. + References Reference 1: 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=84173941&loc=SL6953423-111524 + Details
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