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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
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Income Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  | $ 52,217 | $ 45,137 | $ 43,538 | $ 36,332 | $ 37,774 | $ 33,471 | $ 28,354 | $ 24,893 | $ 177,224 | $ 124,492 | $ 98,760
Interest expense |  | (6,421) | (5,625) | (4,981) | (4,513) | (4,230) | (3,053) | (2,447) | (2,404) | (21,540) | (12,134) | (8,109)
Provision for loan losses |  | (1,931) | (572) | (1,447) | (7,678) | (2,446) | (2,819) | (1,939) | 511 | (11,628) | (6,693) | (4,529)
Gain on sale of subsidiary |  |  |  |  | 20,860 |  |  |  |  | 20,860 |  |
Other income |  | 3,998 | 4,171 | 5,202 | 6,425 |  |  |  |  | 19,796 |  | 18,180
Loss on intercompany sale of loans |  |  |  |  |  |  |  |  |  |  | (794) |
Salaries and employee benefits |  |  |  |  |  |  |  |  |  | (72,696) | (54,531) | (50,175)
Other expense |  |  |  |  |  |  |  |  |  | (15,422) | (11,849) | (9,516)
Income tax (expense) benefit |  | (8,327) | (5,104) | (5,331) | (6,116) | (4,134) | (3,099) | (2,679) | (2,897) | (24,878) | (12,809) | (8,421)
Net income |  | 6,305 | 9,782 | 9,660 | 10,473 | 6,261 | 4,807 | 4,626 | 5,006 | 36,220 | 20,700 | 29,133
Dividends on preferred stock |  | (194) | (195) | (193) | (192) | (197) | (301) | (195) | (194) | (774) | (887) | (780)
Net income available to common stockholders |  | $ 6,111 | $ 9,587 | $ 9,467 | $ 10,281 | $ 6,064 | $ 4,506 | $ 4,431 | $ 4,812 | 35,446 | 19,813 | 28,353
Parent Company |  |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 1,415 | 793 | 718
Interest expense |  |  |  |  |  |  |  |  |  | (5,300) | (2,262) | (291)
Provision for loan losses |  |  |  |  |  |  |  |  |  | (91) |  |
Gain on sale of subsidiary |  |  |  |  |  |  |  |  |  | 20,860 |  |
Other income |  |  |  |  |  |  |  |  |  | 1,572 | 2,991 | 1,040
Loss on intercompany sale of loans | [1] |  |  |  |  |  |  |  |  |  | (794) |
Salaries and employee benefits |  |  |  |  |  |  |  |  |  | (5,686) | (581) | (2,781)
Other expense |  |  |  |  |  |  |  |  |  | (3,138) | (1,940) | (3,099)
Income (loss) before income tax and undistributed subsidiary income |  |  |  |  |  |  |  |  |  | 9,632 | (1,793) | (4,413)
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  | (3,087) | (487) | 700
Equity in undistributed subsidiary income |  |  |  |  |  |  |  |  |  | 30,347 | 22,308 | 32,846
Net income |  |  |  |  |  |  |  |  |  | 36,892 | 20,028 | 29,133
Dividends on preferred stock |  |  |  |  |  |  |  |  |  | (774) | (887) | (780)
Net income available to common stockholders |  |  |  |  |  |  |  |  |  | 36,118 | 19,141 | 28,353
Comprehensive income attributable to Parent |  |  |  |  |  |  |  |  |  | $ 35,900 | $ 20,147 | $ 28,459
[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 stockholders’ equity to consolidated stockholders’ equity at for the year ended December 31, 2016: Year Ended December 31, (Dollars in thousands) 2016 Parent company stockholders' equity $288,673 Parent company loss on intercompany sale of loans 794 TBK Bank discount accretion (122) Consolidated stockholders' equity $289,345

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