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Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks $ 98,724,000 $ 74,967,000  
Interest-bearing deposits 4,258,000 3,511,000  
Securities available for sale 1,171,303,000 1,142,776,000  
Other investments 28,228,000 39,796,000  
Loans held for sale 0 13,412,000  
Loans 4,204,704,000 4,043,643,000 4,218,083,000
Deposits 4,557,881,000 4,504,684,000  
Short-term borrowings 356,227,000 312,777,000 187,861,000
Long-term debt 174,471,000 101,664,000  
Subordinated debt 105,750,000 105,750,000  
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 28,228,000 39,796,000  
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 98,724,000 74,967,000  
Interest-bearing deposits 4,258,000 3,511,000  
Securities available for sale 1,171,303,000 1,142,776,000  
Other investments 28,228,000 39,796,000  
Loans held for sale 0 13,412,000  
Loans 4,204,704,000 4,043,643,000  
Deposits 4,557,881,000 4,504,684,000  
Short-term borrowings 356,227,000 312,777,000  
Long-term debt 174,471,000 101,664,000  
Subordinated debt 105,750,000 105,750,000  
Estimated Fair Value [Member]
      
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 98,724,000 74,967,000  
Interest-bearing deposits 4,258,000 3,511,000  
Securities available for sale 1,171,303,000 1,142,776,000  
Other investments 28,228,000 39,796,000  
Loans held for sale 0 13,412,000  
Loans 4,245,114,000 4,113,525,000  
Deposits 4,493,764,000 4,452,235,000  
Short-term borrowings 356,221,000 312,777,000  
Long-term debt 176,178,000 103,749,000  
Subordinated debt 76,735,000 75,310,000  
Estimated Fair Value [Member] | Level 1 [Member]
      
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 98,724,000    
Interest-bearing deposits 4,258,000    
Securities available for sale 555,000    
Other investments 0    
Loans held for sale 0    
Loans 0    
Deposits 0    
Short-term borrowings 0    
Long-term debt 0    
Subordinated debt 0    
Estimated Fair Value [Member] | Level 2 [Member]
      
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 0    
Interest-bearing deposits 0    
Securities available for sale 1,145,955,000    
Other investments 28,228,000    
Loans held for sale 0    
Loans 82,949,000    
Deposits 4,493,764,000    
Short-term borrowings 356,221,000    
Long-term debt 176,178,000    
Subordinated debt 0    
Estimated Fair Value [Member] | Level 3 [Member]
      
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 0    
Interest-bearing deposits 0    
Securities available for sale 24,793,000    
Other investments 0    
Loans held for sale 0    
Loans 4,162,165,000    
Deposits 0    
Short-term borrowings 0    
Long-term debt 0    
Subordinated debt $ 76,735,000