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Note Loans - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial Construction Loans Sold   $ 0   $ 1,000  
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds $ 176,092 215,863 $ 353,182 387,981  
Loans and Leases Receivable, Gross, Carrying Amount, Covered 536,341   536,341   $ 572,878
GNMA          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 136,000 170,000 283,000 304,000  
FNMA          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 37,000 43,000 65,000 79,000  
Residential Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Residential Mortgage Loans Sold 26,000 19,000 54,000 40,000  
Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Purchase of Loans 108,000 58,000 150,000 164,000  
Mortgages          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Purchase of Loans 124,000 $ 118,000 260,000 240,000  
Commercial Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Purchase of Loans       51,000  
Leasing          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Purchase of Loans 0   2,000    
Westernbank Puerto Rico | Bulk Sale          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Purchase of Loans       $ 100,000  
Westernbank Puerto Rico | ASC Subtopic 310-30          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding principal balance of SOP loans 2,000,000   2,000,000   2,100,000
Westernbank Puerto Rico | ASC Subtopic 310-20          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and Leases Receivable, Gross, Carrying Amount, Covered 10,000   10,000   10,000
SOP Other Loans Acquired | ASC Subtopic 310-30          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding principal balance of SOP loans $ 679,000   $ 679,000   $ 700,000