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Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Accumulated amortization | $ (1,183) | $ (838)
Goodwill | 11,031 | 11,031
Gross carrying amount | 13,727 | 13,727
Net carrying amount | $ 12,544 | 12,889
Core deposit intangible [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible asset amortization period | 10 years |
Gross carrying amount, excluding goodwill | $ 2,213 | 2,213
Accumulated amortization | (1,119) | (838)
Net carrying amount, excluding goodwill | $ 1,094 | 1,375
Third Party Originators Intangible [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Intangible asset amortization period | 7 years |
Gross carrying amount, excluding goodwill | $ 483 | 483
Accumulated amortization | (64) | 0
Net carrying amount, excluding goodwill | $ 419 | $ 483

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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 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 Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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