Parent Company Financial Information, Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statements of Income [Abstract]
Other operating expenses	$ (32,163)	$ (29,400)	$ (27,352)
Income tax benefit	(4,744)	(8,318)	(4,885)
Net income	12,551	8,748	8,051
Parent Company [Member]
Statements of Income [Abstract]
Dividends from subsidiary	0	0	0
Other operating expenses	(226)	(224)	(203)
Income tax benefit	66	92	88
Loss before undistributed earnings of subsidiary	(160)	(132)	(115)
Equity in undistributed earnings of subsidiary	12,711	8,880	8,166
Net income	$ 12,551	$ 8,748	$ 8,051