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Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks $ 82,327 $ 74,427  
Interest-bearing deposits 9,087 3,012  
Securities available for sale, at fair value 1,351,039 1,318,365  
Other investments 34,047 35,444  
Loans 4,252,213 4,283,833 4,218,810
Deposits 4,647,817 4,603,863  
Short-term borrowings 572,965 626,615  
Long-term debt 144,268 144,385  
Subordinated debt 72,167 72,167  
Level 1 [Member]
      
Fair Value Measurements Of Financial Instruments [Line Items]      
Securities available for sale, at fair value 0 0  
Other investments 0 0  
Level 2 [Member]
      
Fair Value Measurements Of Financial Instruments [Line Items]      
Securities available for sale, at fair value 1,321,743 1,293,422  
Other investments 34,047 35,444  
Level 3 [Member]
      
Fair Value Measurements Of Financial Instruments [Line Items]      
Securities available for sale, at fair value 29,296 24,943  
Other investments 0 0  
Carrying Amount [Member]
      
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 82,327 74,427  
Interest-bearing deposits 9,087 3,012  
Securities available for sale, at fair value 1,351,039 1,318,365  
Other investments 34,047 35,444  
Loans 4,252,213 4,283,833  
Deposits 4,647,817 4,603,863  
Short-term borrowings 572,965 626,615  
Long-term debt 144,268 144,385  
Subordinated debt 72,167 72,167  
Estimate of Fair Value, Fair Value Disclosure [Member]
      
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 82,327 74,427  
Interest-bearing deposits 9,087 3,012  
Securities available for sale, at fair value 1,351,039 1,318,365  
Other investments 34,047 35,444  
Loans 4,283,303 4,321,847  
Deposits 4,573,324 4,531,685  
Short-term borrowings 572,954 626,603  
Long-term debt 145,510 145,477  
Subordinated debt 61,347 51,706  
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member]
      
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 82,327 74,427  
Interest-bearing deposits 9,087 3,012  
Securities available for sale, at fair value 0 0  
Other investments 0 0  
Loans 0 0  
Deposits 0 0  
Short-term borrowings 0 0  
Long-term debt 0 0  
Subordinated debt 0 0  
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member]
      
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 0 0  
Interest-bearing deposits 0 0  
Securities available for sale, at fair value 1,321,743 1,293,422  
Other investments 34,047 35,444  
Loans 32,940 36,903  
Deposits 4,573,324 4,531,685  
Short-term borrowings 572,954 626,603  
Long-term debt 145,510 145,477  
Subordinated debt 0 0  
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member]
      
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 0 0  
Interest-bearing deposits 0 0  
Securities available for sale, at fair value 29,296 24,943  
Other investments 0 0  
Loans 4,250,363 4,284,944  
Deposits 0 0  
Short-term borrowings 0 0  
Long-term debt 0 0  
Subordinated debt $ 61,347 $ 51,706