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Goodwill and Other Intangible Assets - Schedule of Gross Carrying Amounts and Accumulated Amortization of Other Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 109,301 | $ 129,270
Accumulated Amortization and Impairment | (72,050) | (83,256)
Net Carrying Amount | 37,251 | 46,014
Core deposit |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 92,754 | 112,723
Accumulated Amortization and Impairment | (57,684) | (69,623)
Net Carrying Amount | 35,070 | 43,100
Customer trust relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 16,547 | 16,547
Accumulated Amortization and Impairment | (14,366) | (13,633)
Net Carrying Amount | $ 2,181 | $ 2,914

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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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