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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, 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

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