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Investment Securities - Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months $ 267,966 $ 4,246,991
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (2,624) (49,727)
Estimated fair value, 12 months or more 105,755 104,154
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (22,912) (20,937)
Held to maturity, Estimated fair value, Less than 12 months 33,249 502,896
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (3,164) (2,136)
Held to maturity, Estimated fair value, 12 months or more 231,627 346,875
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (38,163) (47,469)
Total investment securities, fair value less than 12 months 301,215 4,749,887
Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses (5,788) (51,863)
Total of investment securities, fair value, 12 Months or More 337,382 451,029
Investment Securities Continuous Unrealized Loss Position Twelve Months or Longer Aggregate Losses (61,075) (68,406)
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 1,703 1,335
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (48) (40)
Held to maturity, Estimated fair value, Less than 12 months 15,813 42,913
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (89) (335)
Held to maturity, Estimated fair value, 12 months or more 12,057 5,853
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (151) (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 245,977 4,061,899
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (1,123) (48,534)
Estimated fair value, 12 months or more 7,590 7,216
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (103) (167)
Held to maturity, Estimated fair value, Less than 12 months   459,983
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses   (1,801)
Held to maturity, Estimated fair value, 12 months or more 125,116 228,867
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (350) (6,016)
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 17,436  
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (3,075)  
Held to maturity, Estimated fair value, 12 months or more 94,454 112,155
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (37,662) (41,367)
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 7,831 147,508
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (14) (187)
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 40 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 2,883 5,711
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (1,078) (335)
Estimated fair value, 12 months or more 4,285 2,063
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (1,338) (853)
Other Debt Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 11,275 12,935
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (409) (462)
Estimated fair value, 12 months or more 91,997 93,344
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (21,261) (19,728)
Equity Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months   18,073
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses   (207)
Estimated fair value, 12 months or more 140 153
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses $ (161) $ (147)