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Parent Company Only Condensed Financial Information - Condensed Parent Company Only Statements of Cash Flows (Parenthetical) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]    
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 $ 391,698