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Securities - Schedule of Unrealized Losses on Investment Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Unrealized Losses, Total $ (14,099) $ (33,861)
Obligations of Government Agencies [Member]
   
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Less than 12 months, Fair Value 18,919 54,356
Less than 12 months, Unrealized Losses (124) (1,911)
Less than 12 months, Number of Securities 5 15
12 months or more, Fair Value 19,790 5,083
12 months or more, Unrealized Losses (520) (27)
12 months or more, Number of Securities 5 2
Fair Value, Total 38,709 59,439
Unrealized Losses, Total (644) (1,938)
Number of Securities Total 10 17
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Agencies [Member]
   
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Less than 12 months, Fair Value 191,506 513,495
Less than 12 months, Unrealized Losses (1,380) (14,639)
Less than 12 months, Number of Securities 37 89
12 months or more, Fair Value 239,724 37,002
12 months or more, Unrealized Losses (8,671) (2,308)
12 months or more, Number of Securities 42 11
Fair Value, Total 431,230 550,497
Unrealized Losses, Total (10,051) (16,947)
Number of Securities Total 79 100
Obligations of State and Political Subdivisions [Member]
   
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Less than 12 months, Fair Value 20,790 181,667
Less than 12 months, Unrealized Losses (107) (10,830)
Less than 12 months, Number of Securities 34 277
12 months or more, Fair Value 115,199 47,793
12 months or more, Unrealized Losses (3,113) (3,431)
12 months or more, Number of Securities 177 76
Fair Value, Total 135,989 229,460
Unrealized Losses, Total (3,220) (14,261)
Number of Securities Total 211 353
Corporate Debt Securities [Member]
   
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Less than 12 months, Fair Value 4,996 19,837
Less than 12 months, Unrealized Losses (4) (560)
Less than 12 months, Number of Securities 1 7
12 months or more, Fair Value 4,525 2,845
12 months or more, Unrealized Losses (180) (155)
12 months or more, Number of Securities 2 1
Fair Value, Total 9,521 22,682
Unrealized Losses, Total (184) (715)
Number of Securities Total 3 8
Total Temporarily Impaired Securities [Member]
   
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]    
Less than 12 months, Fair Value 236,211 769,355
Less than 12 months, Unrealized Losses (1,615) (27,940)
Less than 12 months, Number of Securities 77 388
12 months or more, Fair Value 379,238 92,723
12 months or more, Unrealized Losses (12,484) (5,921)
12 months or more, Number of Securities 226 90
Fair Value, Total 615,449 862,078
Unrealized Losses, Total $ (14,099) $ (33,861)
Number of Securities Total 303 478