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Allowance for Loan and Lease Losses - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans and written loan commitments at fair value under the fair value option $ 792,117   $ 792,117     $ 812,991    
Loan held for sale 4,342   4,342     7,351    
Loans guaranteed by U.S. Government Agencies 8,772,155   8,772,155     8,752,832    
Allowance for loan leases 135,950 $ 68,003 135,950 $ 68,003 $ 72,781 70,774 $ 66,193 $ 64,540
Unfunded loan commitment                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Reserve for unfunded loan commitments 1,100   1,100     500    
Receivables acquired with deteriorated credit quality                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for loan leases 700   700     600    
Net reversal of provision 96 $ 267 148 $ (118)        
Loans Guaranteed by US Government Authorities                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans guaranteed by U.S. Government Agencies 146,200   146,200     154,200    
Loans Guaranteed by US Government Authorities | Loans and Leases with Allowance                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans guaranteed by U.S. Government Agencies $ 138,000   $ 138,000     $ 145,900