Loans - Summary of TDRs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructured Interest Rate	$ 4,281	$ 0
Term	5,172	766
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructured Interest Rate	2,753	0
Term	4,355	140
SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructured Interest Rate	0	0
Term	0	0
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructured Interest Rate	0	0
Term	0	0
Indirect automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructured Interest Rate	0	0
Term	0	478
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructured Interest Rate	0	0
Term	33	0
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructured Interest Rate	1,528	0
Term	784	148
Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructured Interest Rate	0	0
Term	$ 0	$ 0