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Mortgage Servicing - Schedule of Estimated Amortization Expense for MSRs (Details) - Mortgage Servicing Rights - Amortized Costs [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Servicing Asset at Amortized Cost [Line Items]  
2018 $ 46,705
2019 38,141
2020 34,824
2021 33,578
2022 $ 30,552