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Goodwill and Other Intangible Assets - Estimated Amortization Expense of Servicing Rights (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]            
Remainder of 2021 $ 214          
2022 666          
2023 409          
2024 267          
2025 145          
Thereafter 48          
Servicing Rights [Member]            
Finite-Lived Intangible Assets [Line Items]            
Remainder of 2021 1,426          
2022 1,174          
2023 964          
2024 790          
2025 646          
Thereafter 2,610          
Total: Estimated amortization expense of servicing rights $ 7,610 $ 7,433 $ 6,408 $ 6,279 $ 6,081 $ 6,626