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Parent Company Financial Information (Condensed Statements Of Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]      
Interest expense $ 12,541 $ 10,137 $ 7,281
Income before income tax benefit and equity in undistributed earnings of subsidiary 44,141 38,876 38,980
Income tax (expense) benefit (12,210) (10,539) (9,625)
Net income 31,931 28,337 29,355
Parent Company [Member]      
Condensed Financial Statements, Captions [Line Items]      
Dividends from subsidiary and associated companies 16,000 16,000 20,920
Management and service fees from subsidiary 855 599 417
Other income 1,296 1,175 74
Total income 18,151 17,774 21,411
Interest expense 2,471 1,750  
Operating expenses 5,950 3,509 3,437
Total expenses 8,421 5,259 3,437
Income before income tax benefit and equity in undistributed earnings of subsidiary 9,730 12,515 17,974
Income tax (expense) benefit 2,783 1,814 1,120
Income before equity in undistributed earnings of subsidiary 12,513 14,329 19,094
Equity in undistributed earnings of subsidiary 19,418 14,008 10,261
Net income $ 31,931 $ 28,337 $ 29,355