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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, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 196,132 $ 226,885
Accumulated Amortization and Impairment (88,013) (100,480)
Net Carrying Amount 108,119 126,405
Core deposit    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 143,511 170,642
Accumulated Amortization and Impairment (68,312) (80,951)
Net Carrying Amount 75,199 89,691
Customer trust relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 52,621 56,243
Accumulated Amortization and Impairment (19,701) (19,529)
Net Carrying Amount $ 32,920 $ 36,714