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Goodwill and Other Intangible Assets - Summary of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | $ 84,462 | $ 84,462
Accumulated Amortization | (43,760) | (39,597)
Net Carrying Amount | 40,702 | 44,865
Core Deposit Intangibles |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | 82,492 | 82,492
Accumulated Amortization | (42,731) | (38,634)
Net Carrying Amount | 39,761 | 43,858
Customer Relationship Intangible |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | 1,970 | 1,970
Accumulated Amortization | (1,029) | (963)
Net Carrying Amount | $ 941 | $ 1,007

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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/disclosureRef -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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