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Investment Securities - Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months $ 4,246,991 $ 65,554
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (49,727) (2,659)
Estimated fair value, 12 months or more 104,154 103,914
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (20,937) (18,584)
Held to maturity, Estimated fair value, Less than 12 months 502,896 167,299
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (2,136) (545)
Held to maturity, Estimated fair value, 12 months or more 346,875 574,560
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (47,469) (51,220)
Total investment securities, fair value less than 12 months 4,749,887 232,853
Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses (51,863) (3,204)
Total of investment securities, fair value, 12 Months or More 451,029 678,474
Investment Securities Continuous Unrealized Loss Position Twelve Months or Longer Aggregate Losses (68,406) (69,804)
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 1,785
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (2) (52)
Estimated fair value, 12 months or more 1,335 121
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (40) (1)
Held to maturity, Estimated fair value, Less than 12 months 42,913 29,886
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (335) (184)
Held to maturity, Estimated fair value, 12 months or more 5,853 268
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (86) (5)
Government Issued or Guaranteed [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 4,061,899 39,001
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (48,534) (186)
Estimated fair value, 12 months or more 7,216 5,555
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (167) (151)
Held to maturity, Estimated fair value, Less than 12 months 459,983 137,413
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (1,801) (361)
Held to maturity, Estimated fair value, 12 months or more 228,867 446,780
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (6,016) (6,639)
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 43 65
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (2) (3)
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 147,508 6,505
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (187) (5)
Privately Issued [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Held to maturity, Estimated fair value, 12 months or more 112,155 127,512
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (41,367) (44,576)
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 2,108
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (335) (696)
Estimated fair value, 12 months or more 2,063 5,512
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (853) (337)
Other Debt Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 12,935 14,017
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (462) (556)
Estimated fair value, 12 months or more 93,344 92,661
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (19,728) (18,092)
Equity Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 18,073 2,138
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (207) $ (1,164)
Estimated fair value, 12 months or more 153  
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses $ (147)