Condensed Financial Statements Of Parent Company (Statements of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Realized securities losses	$ (14)	$ 1,127	$ 1,444
Interest expense	18,380	15,084	12,867
Income before income taxes	21,579	25,305	22,995
Income tax expense	9,664	8,008	6,893
Net Income	11,915	17,297	16,102
Net income (loss) applicable to common shares	11,915	17,297	16,102
Parent Company [Member]
Dividends from subsidiaries	6,500	5,070	10,000
Other dividends and interest income	24	21	19
Realized securities losses	0	(14)	0
Management and service fees from subsidiaries	1,964	1,554	1,133
Total income	8,488	6,631	11,152
Interest expense	714	663	747
Operating expenses	2,462	2,820	2,390
Total expenses	3,176	3,483	3,137
Income before income taxes	5,312	3,148	8,015
Income tax expense	(129)	(715)	(692)
Income before equity in undistributed income of subsidiaries	5,441	3,863	8,707
Equity in undistributed income of subsidiaries	6,474	13,434	7,395
Net Income	$ 11,915	$ 17,297	$ 16,102