Fair Value of Assets and Liabilities - Schedule of Gains and Losses Resulting from Nonrecurring Fair Value Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loss from nonrecurring measurements	$ 1,103	$ 1,194	$ 210	$ 1,240
Loans measured for impairment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loss from nonrecurring measurements	299	1,120	(594)	900
Other real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loss from nonrecurring measurements	0	74	0	340
Other operating expense - impairment of equity method investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loss from nonrecurring measurements	$ 804	$ 0	$ 804	$ 0