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Parent Company Only Condensed Financial Information - Condensed Parent Company Only Statements of Income (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
Condensed Income Statements Captions [Line Items]                      
Interest income $ 75,850 $ 71,759 $ 61,249 $ 54,118 $ 52,217 $ 45,137 $ 43,538 $ 36,332 $ 262,976 $ 177,224 $ 124,492
Interest expense (10,969) (9,977) (7,992) (6,988) (6,421) (5,625) (4,981) (4,513) (35,926) (21,540) (12,134)
Provision for loan losses (1,910) (6,803) (4,906) (2,548) (1,931) (572) (1,447) (7,678) (16,167) (11,628) (6,693)
Gain on sale of subsidiary or division       1,071       20,860 1,071 20,860  
Other income 6,794 6,059 4,945 4,101 3,998 4,171 5,202 6,425 21,899 19,796  
Loss on intercompany sale of loans                     (794)
Salaries and employee benefits                 (90,212) (72,696) (54,531)
Other expense                 (22,826) (15,422) (11,849)
Income tax (expense) benefit (4,718) (2,922) (3,508) (3,644) (8,327) (5,104) (5,331) (6,116) (14,792) (24,878) (12,809)
Net income 18,085 9,170 12,385 12,068 6,305 9,782 9,660 10,473 51,708 36,220 20,700
Dividends on preferred stock   (195) (193) (190) (194) (195) (193) (192) (578) (774) (887)
Net income available to common stockholders $ 18,085 $ 8,975 $ 12,192 $ 11,878 $ 6,111 $ 9,587 $ 9,467 $ 10,281 51,130 35,446 19,813
Parent Company                      
Condensed Income Statements Captions [Line Items]                      
Interest income                 2,014 1,415 793
Interest expense                 (6,092) (5,300) (2,262)
Provision for loan losses                 8 (91)  
Gain on sale of subsidiary or division                   20,860  
Other income                 5 1,572 2,991
Loss on intercompany sale of loans [1]                     (794)
Salaries and employee benefits                 (523) (5,686) (581)
Other expense                 (3,710) (3,138) (1,940)
Income (loss) before income tax and undistributed subsidiary income                 (8,298) 9,632 (1,793)
Income tax (expense) benefit                 1,049 (3,087) (487)
Equity in undistributed subsidiary income                 58,957 30,347 22,308
Net income                 51,708 36,892 20,028
Dividends on preferred stock                 (578) (774) (887)
Net income available to common stockholders                 51,130 36,118 19,141
Comprehensive income attributable to Parent                 $ 51,101 $ 35,900 $ 20,147
[1] During the year ended December 31, 2016, a loss was recorded by the parent company as the result of an intercompany sale of loans to its subsidiary, TBK Bank, at the loans’ fair value. The discount on the purchase of the loans recorded by TBK Bank was fully amortized during the year ended December 31, 2017. The parent company loss on sale of the loans and the TBK Bank discount were eliminated in consolidation. The following table presents a reconciliation of parent company net income available to common stockholders to consolidated net income available to common stockholders: Year Ended December 31, (Dollars in thousands) 2018 2017 2016 Parent company net income available to common stockholders $51,130 $36,118 $19,141 Parent company loss on intercompany sale of loans — — 794 TBK Bank discount accretion — (672) (122) Consolidated net income available to common stockholders $51,130 $35,446 $19,813