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Goodwill and Other Intangibles Assets - Intangible assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 25,605 | $ 25,605
Accumulated Amortization | (11,544) | (9,082)
Estimated future amortization expense for identifiable intangible assets: |  |
2019 | 2,200 |
2020 | 2,100 |
2021 | 2,000 |
2022 | 1,900 |
2023 | 1,800 |
Core deposits |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization expense | $ 2,500 | 2,700
Center Financial Corporation acquisition | Core deposits |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization period | 7 years |
Gross Carrying Amount | $ 4,100 | 4,100
Accumulated Amortization | $ (4,100) | (3,966)
Pacific International Bancorp, Inc. acquisition | Core deposits |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization period | 7 years |
Gross Carrying Amount | $ 604 | 604
Accumulated Amortization | $ (579) | (534)
Foster Bankshares Inc acquisition | Core deposits |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization period | 10 years |
Gross Carrying Amount | $ 2,763 | 2,763
Accumulated Amortization | $ (1,893) | (1,636)
Wilshire Bancorp, Inc | Core deposits |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization period | 10 years |
Gross Carrying Amount | $ 18,138 | 18,138
Accumulated Amortization | $ (4,972) | $ (2,946)

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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=98514028&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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