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Goodwill and Other Intangible Assets - Estimated Amortization Expense of Servicing Rights (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Remainder of 2017 $ 674
2018 2,115
2019 1,565
2020 1,200
2021 923
Thereafter 1,534
Servicing Rights [Member]  
Finite-Lived Intangible Assets [Line Items]  
Remainder of 2017 989
2018 857
2019 737
2020 632
2021 542
Thereafter $ 2,799