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Parent Company Financial Information (Condensed Statements Of Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements Captions Line Items      
Interest expense $ 38,888 $ 29,868 $ 17,495
Income before income tax benefit and equity in undistributed earnings of subsidiary 59,421 49,532 43,471
Income tax (expense) benefit (10,559) (10,006) (9,945)
Net income 48,862 39,526 33,526
Parent Company [Member]      
Condensed Financial Statements Captions Line Items      
Dividends from subsidiary and associated companies 20,000 20,000 12,000
Management and service fees from subsidiaries 146 137 1,185
Other income 97 137 1,298
Total income 20,243 20,274 14,483
Interest expense 2,471 2,471 2,471
Operating expenses 3,073 4,156 4,249
Total expense 5,544 6,627 6,720
Income before income tax benefit and equity in undistributed earnings of subsidiary 14,699 13,647 7,763
Income tax (expense) benefit 596 1,745 1,817
Income before equity in undistributed earnings of subsidiary 15,295 15,392 9,580
Equity in undistributed earnings of subsidiary 33,567 24,134 23,946
Net income $ 48,862 $ 39,526 $ 33,526