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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Income [Abstract]                      
Dividends from subsidiaries                 $ 906 $ 449 $ 226
Operating Expenses [Abstract]                      
Interest expense-subordinated debentures and notes                 5,798 5,095 1,894
Interest expense-notes payable $ 13,409 $ 12,664 $ 10,831 $ 8,993 $ 7,385 $ 6,843 $ 5,909 $ 5,098 45,897 25,235 13,729
Income tax benefit (4,899) (1,802) (4,881) (3,778) (19,820) (7,856) (5,545) (5,106) (15,360) (38,327) (26,002)
Net income $ 23,529 $ 22,516 $ 22,251 $ 20,921 $ 7,529 $ 16,315 $ 11,955 $ 12,391 89,217 48,190 48,837
Total comprehensive income                 84,587 46,113 46,878
Parent [Member]                      
Operating Income [Abstract]                      
Dividends from subsidiaries                 30,000 20,000 7,500
Other                 1,784 708 491
Total income                 32,984 20,708 7,991
Operating Expenses [Abstract]                      
Interest expense-subordinated debentures and notes                 5,798 5,094 1,893
Interest expense-notes payable                 62 89 53
Other expenses                 7,087 5,486 5,526
Total expenses                 12,947 10,669 7,472
Income before taxes and equity in undistributed earnings of subsidiaries                 20,037 10,039 519
Income tax benefit                 3,482 3,098 2,583
Net income                 23,519 13,137 3,102
Equity in undistributed earnings of subsidiaries                 65,698 35,053 45,735
Total comprehensive income                 $ 89,217 $ 48,190 $ 48,837