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Repurchase Agreements (Maturity of Repurchase Agreements) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 200,000 $ 200,000
Due In 2017 [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 0  
Due In 2018 [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 100,000  
Due In 2019 [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 0  
Due In 2020 [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 100,000  
Due In 2021 [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 0  
Due Thereafter [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 0