Investment Securities - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) security	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) security	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Investments, Debt and Equity Securities [Abstract]
Securities in an unrealized loss position (number of positions) | security	38		38
Proceeds from sale of securities available-for-sale	$ 56,300	$ 410	$ 56,286	$ 410
Net gains on sales of available-for-sale securities	202	$ 0	575	$ 0
Securities pledged as collateral for public funding	$ 90,600		$ 90,600		$ 162,500