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Impairment of Investment Securities - Schedule of Unrealized Losses and Estimated Fair Values (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months $ 135,599 $ 61,767
Gross Unrealized Losses Less Than 12 Months (464) (701)
Estimated Fair Value, 12 Months or More 23,350 22,943
Gross Unrealized Losses 12 Months or More (28,496) (31,785)
Total Estimated Fair Value 158,949 84,710
Total Gross Unrealized Losses (28,960) (32,486)
Pooled Trust Preferred Collateralized Debt Obligations [Member]
    
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months 0 0
Gross Unrealized Losses Less Than 12 Months 0 0
Estimated Fair Value, 12 Months or More 23,316 22,927
Gross Unrealized Losses 12 Months or More (28,496) (31,785)
Total Estimated Fair Value 23,316 22,927
Total Gross Unrealized Losses (28,496) (31,785)
Obligations of States and Political Subdivisions [Member]
    
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months 0 0
Gross Unrealized Losses Less Than 12 Months 0 0
Estimated Fair Value, 12 Months or More 0 0
Gross Unrealized Losses 12 Months or More 0 0
Total Estimated Fair Value 0 0
Total Gross Unrealized Losses 0 0
Corporate Securities [Member]
    
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months 0 4,536
Gross Unrealized Losses Less Than 12 Months 0 (562)
Estimated Fair Value, 12 Months or More 0 0
Gross Unrealized Losses 12 Months or More 0 0
Total Estimated Fair Value 0 4,536
Total Gross Unrealized Losses 0 (562)
Obligations of U.S. Government [Member] | Mortgage - Backed Securities - Residential [Member]
    
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months 0 1,086
Gross Unrealized Losses Less Than 12 Months 0 (6)
Estimated Fair Value, 12 Months or More 13 16
Gross Unrealized Losses 12 Months or More 0 0
Total Estimated Fair Value 13 1,102
Total Gross Unrealized Losses 0 (6)
Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage - Backed Securities - Residential [Member]
    
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months 76,296 25
Gross Unrealized Losses Less Than 12 Months (392)  
Estimated Fair Value, 12 Months or More 21 0
Gross Unrealized Losses 12 Months or More 0 0
Total Estimated Fair Value 76,317 25
Total Gross Unrealized Losses (392) 0
Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage - Backed Securities - Commercial [Member]
    
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months 0 151
Gross Unrealized Losses Less Than 12 Months 0 (1)
Estimated Fair Value, 12 Months or More 0 0
Gross Unrealized Losses 12 Months or More 0 0
Total Estimated Fair Value 0 151
Total Gross Unrealized Losses 0 (1)
Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government - Sponsored Enterprises [Member]
    
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months 59,303 55,969
Gross Unrealized Losses Less Than 12 Months (72) (132)
Estimated Fair Value, 12 Months or More 0 0
Gross Unrealized Losses 12 Months or More 0 0
Total Estimated Fair Value 59,303 55,969
Total Gross Unrealized Losses $ (72) $ (132)