Noninterest Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Non-interest income
Total non-interest income	$ 7,855	$ 5,516	$ 4,125
Administrative service income
Non-interest income
Total non-interest income	2,528	1,723
Merchant services income
Non-interest income
Total non-interest income	4,620	3,032
ACH income
Non-interest income
Total non-interest income	341	290
Other
Non-interest income
Total non-interest income	$ 366	$ 471