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Goodwill and Other Intangible Assets - Estimated Amortization Expense of Servicing Rights (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Remainder of 2018 $ 468
2019 1,565
2020 1,200
2021 923
2022 666
Thereafter 868
Servicing Rights [Member]  
Finite-Lived Intangible Assets [Line Items]  
Remainder of 2018 858
2019 770
2020 682
2021 603
2022 533
Thereafter $ 3,269