Parent Company Financial Information (Condensed Statements Of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Interest expense	$ 10,137	$ 7,281	$ 7,337
Income before income tax benefit and equity in undistributed earnings of subsidiary	38,876	38,980	37,907
Income tax (expense) benefit	(10,539)	(9,625)	(12,377)
Net income	28,337	29,355	25,530
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiary and associated companies	16,000	20,920	15,000
Management and service fees from subsidiary	599	417	368
Other income	1,175	74	71
Total income	17,774	21,411	15,439
Interest expense	1,750
Operating expenses	3,509	3,437	2,906
Total expenses	5,259	3,437	2,906
Income before income tax benefit and equity in undistributed earnings of subsidiary	12,515	17,974	12,533
Income tax (expense) benefit	1,814	1,120	1,020
Income before equity in undistributed earnings of subsidiary	14,329	19,094	13,553
Equity in undistributed earnings of subsidiary	14,008	10,261	11,977
Net income	$ 28,337	$ 29,355	$ 25,530