Loans and Allowance for Loan Losses - Schedule of Non-Accrual Loans, Past Due Loans over 89 Days Outstanding and Accruing and Troubled Debt Restructurings (TDR) by Class of Loans (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	$ 5,611	$ 2,695
Past Due Over 89 Days and Accruing	215	231
Troubled Debt Restructurings	1,146	1,207
Commercial real estate
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual		1,207
Troubled Debt Restructurings	1,146	1,207
Consumer real estate
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	92
Past Due Over 89 Days and Accruing	215	218
Commercial and industrial
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	5,419	1,488
Consumer
Accounts Notes And Loans Receivable [Line Items]
Non-Accrual	$ 100
Past Due Over 89 Days and Accruing		$ 13