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Allowance for Loan and Lease Losses - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and written loan commitments at fair value under the fair value option $ 1,131,111 $ 1,118,687    
Loans held for sale 12,918 9,867    
Guaranteed loans 7,431,936 6,098,475    
Allowance for loan losses 64,642 57,200 $ 47,518 $ 55,864
Unfunded loan commitment        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Reserve for unfunded loan commitments 500 400    
Receivables acquired with deteriorated credit quality        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Guaranteed loans 129,531 108,467    
Allowance for loan losses 1,679 2,776    
(Improvement) impairment of ASC 310-30 loans 1,056 677 $ 3,772  
Loans Guaranteed by US Government Authorities        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Guaranteed loans $ 120,000 $ 105,000