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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
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks $ 74,427 $ 98,724  
Interest-bearing deposits 3,012 4,258  
Securities available for sale 1,318,365 1,171,303  
Other investments 35,444 28,228  
Loans 4,283,833 4,204,704 4,043,643
Deposits 4,603,863 4,557,881  
Short-term borrowings 626,615 356,227 312,777
Long-term debt 144,385 174,471  
Subordinated debt 72,167 105,750  
Level 1 [Member]
     
Fair Value Measurements Of Financial Instruments [Line Items]      
Other investments 0 0  
Level 2 [Member]
     
Fair Value Measurements Of Financial Instruments [Line Items]      
Other investments 35,444 28,228  
Level 3 [Member]
     
Fair Value Measurements Of Financial Instruments [Line Items]      
Other investments 0 0  
Carrying Amount [Member]
     
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 74,427 98,724  
Interest-bearing deposits 3,012 4,258  
Securities available for sale 1,318,365 1,171,303  
Other investments 35,444 28,228  
Loans 4,283,833 4,204,704  
Deposits 4,603,863 4,557,881  
Short-term borrowings 626,615 356,227  
Long-term debt 144,385 174,471  
Subordinated debt 72,167 105,750  
Estimated Fair Value [Member]
     
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 74,427 98,724  
Interest-bearing deposits 3,012 4,258  
Securities available for sale 1,318,365 1,171,303  
Other investments 35,444 28,228  
Loans 4,321,847 4,245,114  
Deposits 4,531,685 4,493,764  
Short-term borrowings 626,603 356,221  
Long-term debt 145,477 176,178  
Subordinated debt 51,706 76,735  
Estimated Fair Value [Member] | Level 1 [Member]
     
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 74,427 98,724  
Interest-bearing deposits 3,012 4,258  
Securities available for sale 0 555  
Other investments 0 0  
Loans 0 0  
Deposits 0 0  
Short-term borrowings 0 0  
Long-term debt 0 0  
Subordinated debt 0 0  
Estimated Fair Value [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 1,293,422 1,145,955  
Other investments 35,444 28,228  
Loans 36,903 82,949  
Deposits 4,531,685 4,493,764  
Short-term borrowings 626,603 356,221  
Long-term debt 145,477 176,178  
Subordinated debt 0 0  
Estimated Fair Value [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 24,943 24,793  
Other investments 0 0  
Loans 4,284,944 4,162,165  
Deposits 0 0  
Short-term borrowings 0 0  
Long-term debt 0 0  
Subordinated debt $ 51,706 $ 76,735