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Acquisitions - Pro Forma Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Business Combinations [Abstract]      
Net interest and other income $ 86,694 $ 90,469 $ 77,840
Net income $ 28,002 $ 12,189 $ 13,771
Basic earnings per share (in dollars per share) $ 0.61 $ 0.27 $ 0.30
Diluted earnings per share (in dollars per share) $ 0.60 $ 0.26 $ 0.30