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Note Loans - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable          
Commercial Construction Loans Sold $ 0 $ 8,000 $ 1,000 $ 9,000  
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 215,863 318,058 387,981 524,034  
Loans and Leases Receivable, Gross, Carrying Amount, Covered 607,170   607,170   $ 646,115
Trading account securities          
Accounts, Notes, Loans and Financing Receivable          
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 213,193 313,851 383,441 517,265  
Trading account securities | GNMA          
Accounts, Notes, Loans and Financing Receivable          
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 170,115 243,374 304,127 399,830  
Trading account securities | FNMA          
Accounts, Notes, Loans and Financing Receivable          
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 43,078 70,477 79,314 117,435  
Residential Mortgage          
Accounts, Notes, Loans and Financing Receivable          
Residential Mortgage Loans Sold 19,000 25,000 40,000 65,000  
Consumer          
Accounts, Notes, Loans and Financing Receivable          
Purchase of Loans 58,000   164,000    
Mortgages          
Accounts, Notes, Loans and Financing Receivable          
Purchase of Loans 118,000 $ 213,000 240,000 $ 382,000  
Commercial Loans          
Accounts, Notes, Loans and Financing Receivable          
Purchase of Loans 0   51,000    
Covered loans          
Accounts, Notes, Loans and Financing Receivable          
Loans and Leases Receivable, Gross, Carrying Amount, Covered 607,170   607,170   646,115
Covered loans | Consumer          
Accounts, Notes, Loans and Financing Receivable          
Loans and Leases Receivable, Gross, Carrying Amount, Covered 17,914   17,914   19,013
Covered loans | Mortgages          
Accounts, Notes, Loans and Financing Receivable          
Loans and Leases Receivable, Gross, Carrying Amount, Covered 589,256   589,256   627,102
Westernbank Puerto Rico | Bulk Sale          
Accounts, Notes, Loans and Financing Receivable          
Loans Sold 100,000        
Westernbank Puerto Rico | ASC Subtopic 310-30 | Bulk Sale          
Accounts, Notes, Loans and Financing Receivable          
Loans Sold 99,000        
Westernbank Puerto Rico | ASC Subtopic 310-20          
Accounts, Notes, Loans and Financing Receivable          
Loans and Leases Receivable, Gross, Carrying Amount, Covered 10,000   10,000   10,000
Westernbank Puerto Rico | Covered loans | ASC Subtopic 310-30 | Acquired loans in an FDIC assisted transaction          
Accounts, Notes, Loans and Financing Receivable          
Outstanding principal balance of SOP loans 2,200,000   2,200,000   2,400,000
SOP Other Loans Acquired | ASC Subtopic 310-30          
Accounts, Notes, Loans and Financing Receivable          
Outstanding principal balance of SOP loans $ 710,000   $ 710,000   $ 710,000