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Loans and Allowance for Loan Losses - Summary of Loans Class Modified as TDRs (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Loan
Dec. 31, 2016
USD ($)
Loan
Financing Receivable Recorded Investment [Line Items]    
Number of Loans | Loan 5 6
Commercial    
Financing Receivable Recorded Investment [Line Items]    
Number of Loans | Loan 1  
Pre-Modification Recorded Investment $ 1,293  
Post-Modification Recorded Investment $ 1,293  
Commercial Real Estate    
Financing Receivable Recorded Investment [Line Items]    
Number of Loans | Loan   1
Pre-Modification Recorded Investment   $ 1,047
Post-Modification Recorded Investment   $ 1,047