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Acquisitions - Pro Forma Financial Information (Details) - Arlington Bank and IAB - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Total revenue (net interest income plus other income) $ 96,178 $ 281,392 $ 353,732
Net income $ 19,603 $ 70,651 $ 95,288
Basic (in dollars per share) $ 0.40 $ 1.44 $ 1.95
Diluted (in dollars per share) $ 0.39 $ 1.43 $ 1.94