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Goodwill, Intangible Assets, and Servicing Assets - Intangible Assets (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Jul. 29, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Goodwill | $ 463,975,000 | $ 462,997,000 |  |
Goodwill impairment | 0 |  | $ 0 |
Gross Carrying Amount | 25,605,000 |  |  |
Accumulated Amortization | (7,055,000) |  |  |
Core Deposits |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization expense related to core deposit intangible qssets | $ 676,000 |  | $ 212,000 |
Center Financial Corporation | Core Deposits |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization period | 7 years |  |  |
Gross Carrying Amount | $ 4,100,000 |  |  |
Accumulated Amortization | $ (3,755,000) |  |  |
Pacific International Bancorp, Inc. | Core Deposits |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization period | 7 years |  |  |
Gross Carrying Amount | $ 604,000 |  |  |
Accumulated Amortization | $ (484,000) |  |  |
Foster Bankshares Inc | Core Deposits |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization period | 10 years |  |  |
Gross Carrying Amount | $ 2,763,000 |  |  |
Accumulated Amortization | (1,417,000) |  |  |
Wilshire Bancorp, Inc |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Goodwill | 358,600,000 |  |  | $ 358,574,000
Goodwill, acquired during period | 359,000,000 |  |  |
Goodwill, Purchase Accounting Adjustments |  | (1,400,000) |  |
Goodwill, Period Increase (Decrease) | $ 978,000 | $ (1,400,000) |  |
Wilshire Bancorp, Inc | Core Deposits |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization period | 10 years |  |  |
Gross Carrying Amount | $ 18,138,000 |  |  |
Accumulated Amortization | $ (1,399,000) |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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