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Securities - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Security
Securities
Mar. 31, 2013
Dec. 31, 2013
Schedule Of Securities [Line Items]      
Number of pooled issue securities 23    
Net proceeds from sale of securities $ 85,877 $ 21,919  
Gain on sale of securities 9,461 684  
Securities pledged to secure public deposits, trust deposits and for other purposes, carrying value 946,173   909,548
Securities pledged as collateral for short-term borrowings, carrying value 811,881   860,279
Number of single-issuer securities 4    
Estimated fair value of single-issue trust preferred securities 6,020    
Amortized cost of single-issue trust preferred securities 6,881    
Impairment losses on securities 0 0  
Municipal bond portfolio, value 146,011    
Percent of municipal bond portfolio rated A or better 98.50%    
Percent of municipal bond portfolio, general obligation bonds 98.90%    
Average holding size of municipal bond 1,000    
Percent of portfolio with credit support 69.20%    
State of Pennsylvania [Member]
      
Schedule Of Securities [Line Items]      
Percent of municipal bonds 80.90%    
Pooled TPS [Member]
      
Schedule Of Securities [Line Items]      
Net proceeds from sale of securities 51,540    
Gain on sale of securities $ 13,766