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Commitments And Contingencies - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Loss Contingencies [Line Items] |  |  |
Securities held to maturity, mortgaged related securities, pledged | $ 967,400,000 | $ 2,900,000,000 |
Securities held to maturity, other securities, pledged | 1,200,000,000 | 1,700,000,000 |
Securities available for sale, mortgaged-related securities, pledged | 0 | 11,400,000 |
Loans pledged to FHLB, collateral for wholesale borrowings | 21,500,000,000 |  |
Commitments | 3,128,329,000 |  |
Rental expense under non-cancelable operating lease and license agreements | 32,800,000 | 35,200,000 | $ 33,700,000
Rental income on bank-owned properties, netted in occupancy and equipment expense | 3,700,000 | 3,600,000 | $ 3,900,000
Bankers acceptance outstanding | 151,000 |  |
Total loans |  |  |
Loss Contingencies [Line Items] |  |  |
Commitments | 2,831,824,000 | $ 2,600,000,000 |
Visa Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Fair value contingent obligation to visa U.S.A., based on percentage of membership interest | $ 433,000 |  |

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