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Mortgage Servicing Rights - Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items]    
Total $ 5,449 $ 872
Mortgage servicing rights    
Acquired Finite-Lived Intangible Assets [Line Items]    
2018 387  
2019 338  
2020 293  
2021 243  
2022 195  
After 2022 430  
Total $ 1,886