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Parent Company Financial Information (Condensed Statements Of Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]      
Interest expense $ 17,495 $ 12,541 $ 10,137
Income before income tax benefit and equity in undistributed earnings of subsidiary 43,471 44,141 38,876
Income tax (expense) benefit (9,945) (12,210) (10,539)
Net income 33,526 31,931 28,337
Parent Company [Member]      
Condensed Financial Statements, Captions [Line Items]      
Dividends from subsidiary and associated companies 12,000 16,000 16,000
Management and service fees from subsidiary 1,185 855 599
Other income 1,298 1,296 1,175
Total income 14,483 18,151 17,774
Interest expense 2,471 2,471 1,750
Operating expenses 4,249 5,950 3,509
Total expenses 6,720 8,421 5,259
Income before income tax benefit and equity in undistributed earnings of subsidiary 7,763 9,730 12,515
Income tax (expense) benefit 1,817 2,783 1,814
Income before equity in undistributed earnings of subsidiary 9,580 12,513 14,329
Equity in undistributed earnings of subsidiary 23,946 19,418 14,008
Net income $ 33,526 $ 31,931 $ 28,337