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Goodwill and Other Intangible Assets - Summary of Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 84,962 | $ 84,462
Accumulated Amortization | (47,702) | (39,597)
Net Carrying Amount | 37,260 | 44,865
Core deposit intangible |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 82,492 | 82,492
Accumulated Amortization | (46,599) | (38,634)
Net Carrying Amount | 35,893 | 43,858
Customer relationship intangible |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2,470 | 1,970
Accumulated Amortization | (1,103) | (963)
Net Carrying Amount | $ 1,367 | $ 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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