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Goodwill and Other Intangible Assets - Summary of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | $ 84,462 | $ 84,462
Accumulated Amortization | (45,755) | (39,597)
Net Carrying Amount | 38,707 | 44,865
Core deposit intangibles |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | 82,492 | 82,492
Accumulated Amortization | (44,694) | (38,634)
Net Carrying Amount | 37,798 | 43,858
Customer relationship intangible |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |
Gross Carrying Amount | 1,970 | 1,970
Accumulated Amortization | (1,061) | (963)
Net Carrying Amount | $ 909 | $ 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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