Securities - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) security	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) security	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Investments, Debt and Equity Securities [Abstract]
Purchases			$ 293,503	$ 109,356
Sales	$ 6,451	$ 34,957	93,376	34,957
Maturities, prepayments, and calls			75,305	$ 49,267
Increase in fair value			$ 8,100
Number of positions | security	34		34
Securities in a loss position as a percent of total AFS securities	0.08%		0.08%
Securities pledged to secure public deposits	$ 92,300		$ 92,300		$ 89,800