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Acquisition of a Business - Summary of Pro Forma Information for Results of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Business Combinations [Abstract]    
Total revenues (net interest income and non-interest income) $ 171,059 $ 151,054
Net income (loss) $ 82,252 $ (1,437)
Earnings per share—basic $ 3.54 $ (0.07)
Earnings per share—diluted $ 3.50 $ (0.07)