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Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks $ 66,644,000 $ 72,276,000  
Interest-bearing deposits 2,808,000 2,262,000  
Securities available for sale 886,560,000 1,309,819,000  
Other investments 62,952,000 44,545,000  
Loans held for sale 5,763,000 2,502,000  
Loans 4,683,750,000 4,457,308,000 $ 4,283,833,000
Deposits 4,195,894,000 4,315,511,000  
Short-term borrowings 1,510,825,000 1,105,876,000 $ 626,615,000
Long-term debt 9,314,000 89,459,000  
Subordinated debt 72,167,000 72,167,000  
Level 1 [Member]      
Fair Value Measurements Of Financial Instruments [Line Items]      
Securities available for sale 0 0  
Other investments 0 0  
Level 2 [Member]      
Fair Value Measurements Of Financial Instruments [Line Items]      
Securities available for sale 848,732,000 1,279,400,000  
Other investments 62,952,000 44,545,000  
Level 3 [Member]      
Fair Value Measurements Of Financial Instruments [Line Items]      
Securities available for sale 37,828,000 30,419,000  
Other investments 0 0  
Carrying Amount [Member]      
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 66,644,000 72,276,000  
Interest-bearing deposits 2,808,000 2,262,000  
Securities available for sale 886,560,000 1,309,819,000  
Other investments 62,952,000 44,545,000  
Loans held for sale 5,763,000 2,502,000  
Loans 4,683,750,000 4,457,308,000  
Deposits 4,195,894,000 4,315,511,000  
Short-term borrowings 1,510,825,000 1,105,876,000  
Long-term debt 9,314,000 89,459,000  
Subordinated debt 72,167,000 72,167,000  
Estimated Fair Value [Member]      
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 66,644,000 72,276,000  
Interest-bearing deposits 2,808,000 2,262,000  
Securities available for sale 886,560,000 1,309,819,000  
Other investments 62,952,000 44,545,000  
Loans held for sale 5,763,000 2,502,000  
Loans 4,690,852,000 4,439,766,000  
Deposits 4,198,817,000 4,319,997,000  
Short-term borrowings 1,510,718,000 1,105,867,000  
Long-term debt 9,834,000 90,319,000  
Subordinated debt 62,794,000 62,815,000  
Estimated Fair Value [Member] | Level 1 [Member]      
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 66,644,000 72,276,000  
Interest-bearing deposits 2,808,000 2,262,000  
Securities available for sale 0 0  
Other investments 0 0  
Loans held for sale 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 848,732,000 1,279,400,000  
Other investments 62,952,000 44,545,000  
Loans held for sale 5,763,000 2,502,000  
Loans 30,979,000 34,864,000  
Deposits 4,198,817,000 4,319,997,000  
Short-term borrowings 1,510,718,000 1,105,867,000  
Long-term debt 9,834,000 90,319,000  
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 37,828,000 30,419,000  
Other investments 0 0  
Loans held for sale 0 0  
Loans 4,659,873,000 4,404,902,000  
Deposits 0 0  
Short-term borrowings 0 0  
Long-term debt 0 0  
Subordinated debt $ 62,794,000 $ 62,815,000