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Note Stockholders' equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Stockholders Equity Note [Line Items]      
Puerto Rico Laws Restrictions On Banks Net Income a minimum of 10% of BPPR’s net income    
Equity Restrictions $ 513,000   $ 513,000
Transfers To Statutory Reserve 0 $ 0  
Dividends, Common Stock, Cash $ 25,615 $ 15,549  
Common Stock Dividends Per Share Declared $ 0.25 $ 0.15  
Stock Repurchase Program Authorized Amount $ 75,000    
Treasury Stock Value Acquired Cost Method $ 76,324 $ 764  
Total Common Shares Repurchased Accelerated Share Repurchase Agreements 1,847,372    
Accelerate Share Repurchase Transaction      
Stockholders Equity Note [Line Items]      
Accelerated Share Repurchase Program Adjustment $ 4,500    
Treasury Stock Value Acquired Cost Method $ 79,500