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Loans and Allowance for Loan Losses (Details Textual)
3 Months Ended
Mar. 31, 2019
USD ($)
Loan
Borrower
Mar. 31, 2018
Contract
Dec. 31, 2017
USD ($)
Accounts Notes And Loans Receivable [Line Items]      
Reserve previously allocated to loans     $ 625,000
Period after which loans considered nonperforming 90 days    
Number of loans modified as TDRs 0 7  
Number of commercial loan borrowers | Borrower 1    
Commercial      
Accounts Notes And Loans Receivable [Line Items]      
Decrease in commercial loan balances $ 40,900,000    
Financing receivables, maturity First quarter of 2018    
Charge off amount recorded as loan discount $ 1,100,000    
Number of loans modified as TDRs | Contract   7