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Loans and Allowance for Loan Losses (Details Textual)
$ in Millions
3 Months Ended
Apr. 30, 2020
USD ($)
Loan
Mar. 31, 2020
USD ($)
Loan
Mar. 31, 2019
Loan
Accounts Notes And Loans Receivable [Line Items]      
Period after which loans considered nonperforming   90 days  
Number of loans modified as TDRs | Loan   0 0
Minimum | Subsequent Event      
Accounts Notes And Loans Receivable [Line Items]      
Modified loans, deferral of principal and/or interest for periods 90 days    
Maximum | Subsequent Event      
Accounts Notes And Loans Receivable [Line Items]      
Modified loans, deferral of principal and/or interest for periods 180 days    
Commercial      
Accounts Notes And Loans Receivable [Line Items]      
Decrease in commercial loan balances | $   $ 25.2  
Financing receivables, maturity   First quarter of 2019  
Commercial | Subsequent Event      
Accounts Notes And Loans Receivable [Line Items]      
Number of loans modified as TDRs | Loan 101    
Aggregate amount of modified loans | $ $ 116.5    
Consumer | Subsequent Event      
Accounts Notes And Loans Receivable [Line Items]      
Number of loans modified as TDRs | Loan 26    
Aggregate amount of modified loans | $ $ 7.2