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Stockholders' Equity - Summary of Preferred and Common Stock (Details) - $ / shares
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Class Of Stock [Line Items]      
Common stock, voting par value $ 0.01 $ 0.01  
Common stock, voting shares authorized 150,000,000   150,000,000
Common stock, voting shares issued 29,317,298   24,616,706
Common stock, voting shares outstanding 29,317,298   24,616,706
Series A Non-cumulative Perpetual Preferred Stock      
Class Of Stock [Line Items]      
Par value     $ 0.01
Shares authorized     15,003
Shares issued     15,003
Shares outstanding     15,003
Series B 7.5% Fixed Non-Cumulative Perpetual Preferred Stock      
Class Of Stock [Line Items]      
Par value $ 0.01   $ 0.01
Shares authorized 50,000   50,000
Shares issued 10,438   9,388
Subscription receivable     1,050
Shares outstanding 10,438   9,388