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Mergers and Acquisitions - Additional Information (Details) |  | 3 Months Ended
--- | --- | ---
Jul. 29, 2016 USD ($) branch shares | Mar. 31, 2017 USD ($) state branch | Dec. 31, 2016 USD ($) | Mar. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |
Branches operated | branch |  | 85 |  |
States in which entity operates | state |  | 9 |  |
Loans receivable, Net |  | $ 10,471,008,000 | $ 10,463,989,000 |
Merger and integration expenses |  | 947,000 |  | $ 1,207,000
Wilshire Bancorp, Inc |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value of acquired impaired loans | $ 243,100,000 |  |  |
Branches operated | branch | 35 |  |  |
Assets acquired | $ 4,630,000,000 |  |  |
Goodwill, Purchase Accounting Adjustments |  |  | (1,400,000) |
Goodwill, Period Increase (Decrease) |  | 978,000 | (1,400,000) |
Loans acquired | 3,800,807,000 |  |  |
Deposits acquired | $ 3,812,367,000 |  |  |
Entity shares Issued per acquiree share | shares | 0.7034 |  |  |
Stock issued for acquisitions | shares | 55,500,000 |  |  |
Cash paid for fractional shares | $ 3,000 |  |  |
Consideration paid | 856,312,000 |  |  |
Loans receivable, gross | 4,720,000,000 |  | 5,670,000,000 |
Loans receivable, Net | $ 3,420,000,000 |  | $ 3,590,000,000 |
Wilshire Bancorp, Inc | Other real estate owned [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Purchase Accounting Adjustments |  | (1,700,000) |  |
Wilshire Bancorp, Inc | Deferred Tax Assets [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill, Purchase Accounting Adjustments |  | $ (716,000) |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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