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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Goodwill $ 301,368 $ 293,153
Other assets (184,330) (185,826)
Loans in process 1,230,132 1,149,934
Loans and Leases Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans in process 2,161,343 $ 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