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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Goodwill $ 300,288 $ 293,153
Other assets 177,799 185,826
Loans in process 1,175,642 1,149,934
Loans and Leases Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans in process 2,088,669 $ 1,992,905
Restatement Adjustment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Goodwill 7,135  
Finite-lived intangible assets 5,106  
Other assets $ (12,241)