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Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale $ 575,749    
Derivative assets 3,072   3,424
Derivative liabilities 1,667   1,658
Loans held for sale 5,231 6,469 7,211
Mortgage servicing intangibles 535   709
U.S. Treasury [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 128,740   20,304
U.S. federal agencies [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 346,793   442,075
States and political subdivisions [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 54,971   55,493
Other securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 15,381   13,545
Mortgage-backed securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 29,864   17,974
Level 1 Inputs [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets        
Derivative liabilities        
Loans held for sale        
Mortgage servicing intangibles        
Level 1 Inputs [Member] | U.S. Treasury [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 128,740   20,304
Level 1 Inputs [Member] | U.S. federal agencies [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale        
Level 1 Inputs [Member] | States and political subdivisions [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale        
Level 1 Inputs [Member] | Other securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale        
Level 1 Inputs [Member] | Mortgage-backed securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale        
Level 2 Inputs [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets 3,072   3,424
Derivative liabilities 1,667   1,658
Loans held for sale 5,231   7,211
Mortgage servicing intangibles        
Level 2 Inputs [Member] | U.S. Treasury [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale        
Level 2 Inputs [Member] | U.S. federal agencies [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 346,793   442,075
Level 2 Inputs [Member] | States and political subdivisions [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 54,971   55,493
Level 2 Inputs [Member] | Other securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 3,482   3,421
Level 2 Inputs [Member] | Mortgage-backed securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 12,277   17,974
Level 3 Inputs [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets        
Derivative liabilities        
Loans held for sale        
Mortgage servicing intangibles 535   709
Level 3 Inputs [Member] | U.S. Treasury [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale        
Level 3 Inputs [Member] | U.S. federal agencies [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale        
Level 3 Inputs [Member] | States and political subdivisions [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale        
Level 3 Inputs [Member] | Other securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 11,899   10,124
Level 3 Inputs [Member] | Mortgage-backed securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale $ 17,587