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Acquisitions (Pro forma) (Details) - First Bank Lubbock Bancshares, Inc. - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]    
Net interest income $ 207,168 $ 163,837
Net income available to common stockholders $ 35,378 $ 48,817
Basic earnings per share (in dollars per share) $ 1.04 $ 1.63
Diluted earnings per share (in dollars per share) $ 1.03 $ 1.62