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Fair Values of Assets and Liabilities - Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks $ 98,624,000 $ 91,033,000  
Interest-bearing deposits 8,668,000 24,644,000  
Securities available for sale 731,358,000 778,612,000  
Held-to-maturity Securities 422,096,000 372,513,000  
Other investments 29,837,000 36,498,000  
Loans held for sale 14,850,000 7,052,000  
Loans 5,407,376,000 4,879,347,000 $ 4,683,750,000
Deposits 5,580,705,000 4,947,408,000  
Short-term borrowings 707,466,000 867,943,000 $ 1,510,825,000
Long-term debt 8,161,000 8,749,000  
Subordinated debt 72,167,000 72,167,000  
Capital Lease Obligations, Current 7,590,000 0  
Level 1 [Member]      
Fair Value Measurements Of Financial Instruments [Line Items]      
Securities available for sale 0 0  
Other investments 0 0  
Fair Value, Inputs, Level 2 [Member]      
Fair Value Measurements Of Financial Instruments [Line Items]      
Securities available for sale 706,042,000 743,650,000  
Other investments 29,837,000 36,498,000  
Level 3 [Member]      
Fair Value Measurements Of Financial Instruments [Line Items]      
Securities available for sale 25,316,000 34,962,000  
Other investments 0 0  
Carrying Amount [Member]      
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 98,624,000 91,033,000  
Interest-bearing deposits 8,668,000 24,644,000  
Securities available for sale 731,358,000 778,612,000  
Held-to-maturity Securities 422,096,000 372,513,000  
Other investments 29,837,000 36,498,000  
Loans held for sale 14,850,000 7,052,000  
Loans 5,407,376,000 4,879,347,000  
Deposits 5,580,705,000 4,947,408,000  
Short-term borrowings 707,466,000 867,943,000  
Long-term debt 8,161,000 8,749,000  
Subordinated debt 72,167,000 72,167,000  
Capital Lease Obligations, Current 7,590,000    
Estimated Fair Value [Member]      
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 98,624,000 91,033,000  
Interest-bearing deposits 8,668,000 24,644,000  
Securities available for sale 731,358,000 778,612,000  
Held-to-maturity Securities 418,249,000 368,618,000  
Other investments 29,837,000 36,498,000  
Loans held for sale 14,850,000 7,052,000  
Loans 5,443,434,000 4,878,254,000  
Deposits 5,580,812,000 4,949,714,000  
Short-term borrowings 707,263,000 867,667,000  
Long-term debt 8,548,000 9,169,000  
Subordinated debt 65,785,000 65,656,000  
Capital Lease Obligations, Current 7,590,000    
Estimated Fair Value [Member] | Level 1 [Member]      
Fair Value Measurements Of Financial Instruments [Line Items]      
Cash and due from banks 98,624,000 91,033,000  
Interest-bearing deposits 8,668,000 24,644,000  
Securities available for sale 0 0  
Held-to-maturity Securities 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  
Capital Lease Obligations, Current 0    
Estimated Fair Value [Member] | Fair Value, Inputs, 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 706,042,000 743,650,000  
Held-to-maturity Securities 418,249,000 368,618,000  
Other investments 29,837,000 36,498,000  
Loans held for sale 14,850,000 7,052,000  
Loans 23,249,000 18,679,000  
Deposits 5,580,812,000 4,949,714,000  
Short-term borrowings 707,263,000 867,667,000  
Long-term debt 8,548,000 9,169,000  
Subordinated debt 0 0  
Capital Lease Obligations, Current 7,590,000    
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 25,316,000 34,962,000  
Held-to-maturity Securities 0 0  
Other investments 0 0  
Loans held for sale 0 0  
Loans 5,420,185,000 4,859,575,000  
Deposits 0 0  
Short-term borrowings 0 0  
Long-term debt 0 0  
Subordinated debt 65,785,000 $ 65,656,000  
Capital Lease Obligations, Current $ 0