Goodwill and Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Gross carrying amount at beginning of year	$ 22,114	$ 22,114
Additions	80	0
Other adjustments	(296)	0
Accumulated amortization	(19,297)	(18,437)
Balance at End of Year	$ 2,601	$ 3,677