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Note Supplemental disclosure on the consolidated statments of cash flows (Additional disclosures on cash flow information and non-cash activities) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Cash Flow Noncash Investing And Financing Activities Disclosure Abstract          
Loans transferred to other real estate     $ 23,188 $ 80,992  
Loans transferred to other property     30,973 22,987  
Total loans transferred to foreclosed assets     54,161 103,979  
Loans transfered to other assets     11,218 4,519  
Financed sales of other real estate assets     11,962 10,621  
Financed sales of other foreclosed assets     12,347 5,964  
Total financed sales of other foreclosed and real estate assets     24,309 16,585  
Transfers from loans held-for-sale to loans held-in-portfolio     20,063 1,705  
Loans securitized into investment securities [1]     392,080 454,507  
Trades receivables from brokers and counterparties $ 57,290 $ 999 57,290 999 $ 7,514
Trades payable to brokers and counterparties 22,244 999 22,244 999  
Receivables from investment maturities     19,000 270,000  
Recognition of mortgage servicing rights on securitizations or asset transfers     7,871 7,530  
Interest capitalized on loans subject to the temporary payment moratorium     481 0  
Loans booked under the GNMA buy-back option     380,329 43,783  
Gain from the FDIC termination agreement 0 [2] 0 102,752 [2] 0  
Business acquisition payable $ 13,193 $ 0 $ 13,193 $ 0  
[1]
Includes loans securitized into trading securities and subsequently sold before quarter end.
[2]
Refer to Note 10 for additional information of the Termination Agreement with the FDIC.