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Parent Company Financial Information (Condensed Statements Of Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements Captions Line Items      
Interest expense $ 29,868 $ 17,495 $ 12,541
Income before income tax benefit and equity in undistributed earnings of subsidiary 49,532 43,471 44,141
Income tax (expense) benefit (10,006) (9,945) (12,210)
Net income 39,526 33,526 31,931
Parent Company [Member]      
Condensed Financial Statements Captions Line Items      
Dividends from subsidiary and associated companies 20,000 12,000 16,000
Management and service fees from subsidiaries 137 1,185 855
Other income 137 1,298 1,296
Total income 20,274 14,483 18,151
Interest expense 2,471 2,471 2,471
Operating expenses 4,156 4,249 5,950
Total expense 6,627 6,720 8,421
Income before income tax benefit and equity in undistributed earnings of subsidiary 13,647 7,763 9,730
Income tax (expense) benefit 1,745 1,817 2,783
Income before equity in undistributed earnings of subsidiary 15,392 9,580 12,513
Equity in undistributed earnings of subsidiary 24,134 23,946 19,418
Net income $ 39,526 $ 33,526 $ 31,931