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Goodwill and Other Intangible Assets - Summary of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | $ 56,928 | $ 56,928
Accumulated Amortization | (35,663) | (32,418)
Net Carrying Amount | 21,265 | 24,510
Core Deposit Intangibles |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | 54,958 | 54,958
Accumulated Amortization | (34,765) | (31,586)
Net Carrying Amount | 20,193 | 23,372
Customer Relationship Intangible |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | 1,970 | 1,970
Accumulated Amortization | (898) | (832)
Net Carrying Amount | $ 1,072 | $ 1,138

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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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