Securities - Gross Realized Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Gross gains on sales of securities available for sale	$ 2,933	$ 11	$ 2,979	$ 11
Gross losses on sales of securities available for sale	(2,590)	(27)	(2,631)	(27)
Gains on sales of securities available for sale, net	$ 343	$ (16)	$ 348	$ (16)