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Investment Securities - Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months $ 8,458,946 $ 4,246,991
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (123,747) (49,727)
Estimated fair value, 12 months or more 169,469 104,154
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (17,768) (20,937)
Held to maturity, Estimated fair value, Less than 12 months 654,731 502,896
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (8,190) (2,136)
Held to maturity, Estimated fair value, 12 months or more 86,388 346,875
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (36,528) (47,469)
Total investment securities, fair value less than 12 months 9,113,677 4,749,887
Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses (131,937) (51,863)
Total of investment securities, fair value, 12 Months or More 255,857 451,029
Investment Securities Continuous Unrealized Loss Position Twelve Months or Longer Aggregate Losses (54,296) (68,406)
U.S. Treasury and Federal Agencies [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 1,710,241 147,508
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (9,950) (187)
Estimated fair value, 12 months or more 2,295  
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (2)  
Obligations of States and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months   865
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses   (2)
Estimated fair value, 12 months or more 593 1,335
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (6) (40)
Held to maturity, Estimated fair value, Less than 12 months 17,988 42,913
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (126) (335)
Held to maturity, Estimated fair value, 12 months or more 11,891 5,853
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (98) (86)
Government Issued or Guaranteed [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 6,730,829 4,061,899
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (113,374) (48,534)
Estimated fair value, 12 months or more 81,003 7,216
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (615) (167)
Held to maturity, Estimated fair value, Less than 12 months 618,832 459,983
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (6,842) (1,801)
Held to maturity, Estimated fair value, 12 months or more 17,481 228,867
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (532) (6,016)
Privately Issued Mortgage-Backed Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, 12 months or more 27 43
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (1) (2)
Collateralized Debt Obligations [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months   5,711
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses   (335)
Estimated fair value, 12 months or more   2,063
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses   (853)
Other Debt Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 100 12,935
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (1) (462)
Estimated fair value, 12 months or more 85,400 93,344
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (16,995) (19,728)
Equity Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 17,776 18,073
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (422) (207)
Estimated fair value, 12 months or more 151 153
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (149) (147)
Privately Issued [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Held to maturity, Estimated fair value, Less than 12 months 17,911  
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (1,222)  
Held to maturity, Estimated fair value, 12 months or more 57,016 112,155
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses $ (35,898) $ (41,367)