Securities - Schedule of Realized Gains (Losses) for Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Available for sale at fair value:
Realized gains	$ 0	$ 15	$ 0	$ 89
Realized losses	0	0	0	(58)
Total securities available for sale	0	15	0	31
Held to maturity at cost:
Realized gains	0	38	0	38
Realized losses	0	0	0	0
Total securities held to maturity	0	38	0	38
Net gains on sales of securities	2	$ 53	(6)	$ 69
Net gains on sales of securities, excluding equity securities	$ 0		$ 0