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Loans and Allowance for Loan Losses (Details 8)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Loan
Dec. 31, 2016
Loan
Dec. 31, 2015
USD ($)
Contract
Information related to loans modified in a TDR      
Number of contracts | Loan 0 0  
Commercial real estate      
Information related to loans modified in a TDR      
Number of contracts | Contract     2
Pre-modification recorded investment     $ 3,154
Post-modification recorded investment     $ 3,154