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Parent Company Financial Information (Condensed Statements of Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Financial Statements Captions Line Items      
Interest expense $ 12,475 $ 22,314 $ 38,888
Income before income tax benefit and equity in undistributed earnings of subsidiary 97,222 45,723 59,421
Income tax benefit (19,525) (7,391) (10,559)
Net income 77,697 38,332 48,862
Parent Company [Member]      
Condensed Financial Statements Captions Line Items      
Dividends from subsidiary and associated companies 24,000 23,000 20,000
Management and service fees from subsidiaries 147 146 146
Other income 93 121 97
Total income 24,240 23,267 20,243
Interest expense 4,237 2,888 2,471
Operating expenses 3,379 3,171 3,073
Total expense 7,616 6,059 5,544
Income before income tax benefit and equity in undistributed earnings of subsidiary 16,624 17,208 14,699
Income tax benefit 1,999 1,399 596
Income before equity in undistributed earnings of subsidiary 18,623 18,607 15,295
Equity in undistributed earnings of subsidiary 59,074 19,725 33,567
Net income $ 77,697 $ 38,332 $ 48,862