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Loans and Allowance for Loan Losses - Related Party Loans (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
director
Jun. 30, 2017
director
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Loans and Leases Receivable, Related Parties [Roll Forward]          
Balance at beginning of year     $ 1,988 $ 2,562 $ 3,329
Additions     3,186 0 0
Advances     74 0 165
Repayments     (128) (574) (390)
Reclassified due to a change in borrower status     6,732 0 (542)
Balance at end of year $ 11,852   11,852 1,988 $ 2,562
Related Party Transaction [Line Items]          
Number of new board of directors | director 1,000 1,000      
Directors, Officers, Principal Shareholders and Associates          
Related Party Transaction [Line Items]          
Undisbursed commitment to related parties $ 9,100   $ 9,100 $ 1,100