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Mortgage Servicing - Schedule of Estimated Amortization Expense for MSRs (Details) - Mortgage Servicing Rights - Amortized Costs [Member]
$ in Thousands
Dec. 31, 2015
USD ($)
Servicing Asset at Amortized Cost [Line Items]  
2017 $ 45,960
2018 37,158
2019 35,264
2020 35,832
2021 $ 33,134