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Parent Company Financial Information (Condensed Statements of Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements Captions Line Items      
Interest expense $ 22,314 $ 38,888 $ 29,868
Income before income tax benefit and equity in undistributed earnings of subsidiary 45,723 59,421 49,532
Income tax (expense) benefit (7,391) (10,559) (10,006)
Net income 38,332 48,862 39,526
Parent Company [Member]      
Condensed Financial Statements Captions Line Items      
Dividends from subsidiary and associated companies 23,000 20,000 20,000
Management and service fees from subsidiaries 146 146 137
Other income 121 97 137
Total income 23,267 20,243 20,274
Interest expense 2,888 2,471 2,471
Operating expenses 3,171 3,073 4,156
Total expense 6,059 5,544 6,627
Income before income tax benefit and equity in undistributed earnings of subsidiary 17,208 14,699 13,647
Income tax (expense) benefit 1,399 596 1,745
Income before equity in undistributed earnings of subsidiary 18,607 15,295 15,392
Equity in undistributed earnings of subsidiary 19,725 33,567 24,134
Net income $ 38,332 $ 48,862 $ 39,526