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Investment Securities - Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months $ 228,250 $ 4,246,991
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (1,008) (49,727)
Estimated fair value, 12 months or more 114,814 104,154
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (18,264) (20,937)
Held to maturity, Estimated fair value, Less than 12 months 111,728 502,896
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (2,530) (2,136)
Held to maturity, Estimated fair value, 12 months or more 121,433 346,875
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (37,027) (47,469)
Total investment securities, fair value less than 12 months 339,978 4,749,887
Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses (3,538) (51,863)
Total of investment securities, fair value, 12 Months or More 236,247 451,029
Investment Securities Continuous Unrealized Loss Position Twelve Months or Longer Aggregate Losses (55,291) (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 3,355 147,508
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (3) (187)
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 472 1,335
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (5) (40)
Held to maturity, Estimated fair value, Less than 12 months 19,557 42,913
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (113) (335)
Held to maturity, Estimated fair value, 12 months or more 11,050 5,853
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (107) (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 224,128 4,061,899
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (904) (48,534)
Estimated fair value, 12 months or more 7,294 7,216
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (127) (167)
Held to maturity, Estimated fair value, Less than 12 months 74,629 459,983
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (46) (1,801)
Held to maturity, Estimated fair value, 12 months or more 19,256 228,867
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses (169) (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 34 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   12,935
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses   (462)
Estimated fair value, 12 months or more 106,876 93,344
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (17,969) (19,728)
Equity Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 767 18,073
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses (101) (207)
Estimated fair value, 12 months or more 138 153
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses (162) (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 17,542  
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses (2,371)  
Held to maturity, Estimated fair value, 12 months or more 91,127 112,155
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses $ (36,751) $ (41,367)