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Note Segment reporting (Selected Balance Sheet information) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Segment Reporting Information [Line Items]      
Total assets $ 47,919,428 $ 44,277,337 $ 42,601,267
Deposits 39,648,827 35,453,508  
PUERTO RICO      
Segment Reporting Information [Line Items]      
Total assets 37,167,038 33,705,624  
Loans 18,782,224 17,591,078  
Deposits 31,171,092 27,575,292  
UNITED STATES      
Segment Reporting Information [Line Items]      
Total assets 9,855,363 9,648,865  
Loans 7,085,761 6,608,056  
Deposits 6,956,336 6,635,153  
Other      
Segment Reporting Information [Line Items]      
Total assets 897,027 922,848  
Loans 695,925 743,329  
Deposits [1] $ 1,521,399 $ 1,243,063  
[1]
Represents deposits from BPPR operations located in the US and British Virgin Islands.