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Investment Securities - Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months $ 1,967,719 $ 65,554
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses (19,709) (2,659)
Estimated fair value, 12 months or more 96,136 103,914
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (18,626) (18,584)
Held to maturity, Estimated fair value, Less than 12 months 53,955 167,299
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (421) (545)
Held to maturity, Estimated fair value, 12 months or more 363,666 574,560
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (44,887) (51,220)
Total investment securities, fair value less than 12 months 2,021,674 232,853
Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses (20,130) (3,204)
Total of investment securities, fair value, 12 Months or More 459,802 678,474
Investment Securities Continuous Unrealized Loss Position Twelve Months or Longer Aggregate Losses (63,513) (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 516 1,785
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses (2) (52)
Estimated fair value, 12 months or more 1,405 121
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (46) (1)
Held to maturity, Estimated fair value, Less than 12 months 37,336 29,886
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (292) (184)
Held to maturity, Estimated fair value, 12 months or more 4,096 268
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (55) (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 1,942,135 39,001
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses (18,925) (186)
Estimated fair value, 12 months or more 5,503 5,555
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (116) (151)
Held to maturity, Estimated fair value, Less than 12 months 16,619 137,413
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (129) (361)
Held to maturity, Estimated fair value, 12 months or more 240,730 446,780
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (4,658) (6,639)
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 118,840 127,512
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (40,174) (44,576)
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   6,505
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses   (5)
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 48 65
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (2) (3)
Collateralized Debt Obligations [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 5,733 2,108
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses (324) (696)
Estimated fair value, 12 months or more 2,155 5,512
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (732) (337)
Other Debt Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 19,335 14,017
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses (458) (556)
Estimated fair value, 12 months or more 86,813 92,661
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (17,517) (18,092)
Equity Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months   2,138
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses   $ (1,164)
Estimated fair value, 12 months or more 212  
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses $ (213)