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Parent Company Only Condensed Financial Information - Condensed Parent Company Only Statements of Cash Flows (Parenthetical) (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 Financial Information Of Parent Company Only Disclosure [Abstract]                      
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 $ 18,085 $ 8,975 $ 12,192 $ 11,878 $ 6,111 $ 9,587 $ 9,467 $ 10,281 $ 51,130 $ 35,446 $ 19,813