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Allowance for Loan and Lease Losses - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and written loan commitments at fair value under the fair value option $ 655,185 $ 812,991    
Loan held for sale 12,371 7,351    
Guaranteed loans 8,573,510 8,752,832    
Allowance for loan losses 149,887 70,774 $ 64,540 $ 63,503
Unfunded loan commitment        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Reserve for unfunded loan commitments 2,400 500    
Receivables acquired with deteriorated credit quality        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses 700 600    
(Improvement) impairment of ASC 310-30 loans 188 (559) $ 232  
Loans Guaranteed by US Government Authorities        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Guaranteed loans 869,300 154,200    
Loans Guaranteed by US Government Authorities | Loans and Leases with Allowance for Doubtful Accounts        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Guaranteed loans $ 862,300 $ 145,900