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Note Stockholders' equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Stockholders Equity Note [Line Items]      
Puerto Rico Laws Restrictions On Banks Net Income a minimum of 10% of BPPR’s net income    
Equity Restrictions $ 495,000   $ 495,000
Transfers To Statutory Reserve 0 $ 0 $ 0
Dividends, Common Stock, Cash $ 15,549    
Common Stock Dividends Per Share Declared $ 0.15 $ 0  
Dividend Payable Date To Be Paid Day Month And Year Apr. 01, 2016    
Dividends Payable Date Of Record Day Month And Year Mar. 11, 2016