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Parent Company Only Condensed Financial Statements - Condensed Statements of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Income [Abstract]                      
Dividends from Bank                 $ 895 $ 1,055 $ 906
Dividends from Other Subsidiaries                 1,400 1,500 1,200
Expenses:                      
Interest expense-subordinated debentures and notes                 9,885 7,507 5,798
Interest expense-notes payable $ 6,667 $ 7,433 $ 7,358 $ 13,320 $ 15,625 $ 18,032 $ 17,486 $ 15,274 34,778 66,417 45,897
Income tax benefit (6,508) (4,428) (3,656) (2,971) (7,246) (7,469) (4,479) (4,103) (17,563) (23,297) (15,360)
Net income $ 28,931 $ 17,951 $ 14,634 $ 12,868 $ 29,090 $ 29,069 $ 18,424 $ 16,156 74,384 92,739 89,217
Total comprehensive income                 93,755 119,770 84,587
Parent [Member]                      
Operating Income [Abstract]                      
Dividends from Bank                 37,000 60,000 30,000
Other                 483 663 1,784
Total income                 38,883 62,163 32,984
Expenses:                      
Interest expense-subordinated debentures and notes                 9,885 7,507 5,798
Interest expense-notes payable                 705 1,182 62
Other expenses                 6,946 6,936 7,087
Total expenses                 17,536 15,625 12,947
Income before taxes and equity in undistributed earnings of subsidiaries                 21,347 46,538 20,037
Income tax benefit                 3,448 3,478 3,482
Net income                 24,795 50,016 23,519
Equity in undistributed earnings of subsidiaries                 49,589 42,723 65,698
Total comprehensive income                 $ 74,384 $ 92,739 $ 89,217