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Regulatory Matters - Additional Information (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Regulatory Capital Requirements [Abstract]    
Capital conservation buffer rate in 2016 0.625%  
Capital conservation buffer rate increase in 2017 0.625%  
Capital conservation buffer rate increase in 2018 0.625%  
Capital conservation buffer rate in 2019 2.50%  
Capital conservation buffer rate 1.25% 0.625%