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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Income [Abstract]                      
Dividends from Bank                 $ 1,055 $ 906 $ 449
Dividends from Other Subsidiaries                 1,500 1,200 0
Expenses:                      
Interest expense-subordinated debentures and notes                 7,507 5,798 5,095
Interest expense-notes payable $ 15,625 $ 18,032 $ 17,486 $ 15,274 $ 13,409 $ 12,664 $ 10,831 $ 8,993 66,417 45,897 25,235
Income tax benefit (7,246) (7,469) (4,479) (4,103) (4,899) (1,802) (4,881) (3,778) (23,297) (15,360) (38,327)
Net income $ 29,090 $ 29,069 $ 18,424 $ 16,156 $ 23,529 $ 22,516 $ 22,251 $ 20,921 92,739 89,217 48,190
Total comprehensive income                 119,770 84,587 46,113
Parent [Member]                      
Operating Income [Abstract]                      
Dividends from Bank                 60,000 30,000 20,000
Other                 663 1,784 708
Total income                 62,163 32,984 20,708
Expenses:                      
Interest expense-subordinated debentures and notes                 7,507 5,798 5,094
Interest expense-notes payable                 1,182 62 89
Other expenses                 6,936 7,087 5,486
Total expenses                 15,625 12,947 10,669
Income before taxes and equity in undistributed earnings of subsidiaries                 46,538 20,037 10,039
Income tax benefit                 3,478 3,482 3,098
Net income                 50,016 23,519 13,137
Equity in undistributed earnings of subsidiaries                 42,723 65,698 35,053
Total comprehensive income                 $ 92,739 $ 89,217 $ 48,190