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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
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale $ 561,132    
Derivative assets 3,653   2,200
Derivative liabilities 2,084   991
Loans held for sale 9,519 6,469 10,367
Mortgage servicing intangibles 500   638
U.S. Treasury [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 229,549   20,158
U.S. federal agencies [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 231,276   404,522
States and political subdivisions [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 55,522   51,929
Other securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 16,225   13,273
Mortgage-backed securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 28,560   16,031
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 229,549   20,158
Level 2 Inputs [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets 3,653   2,200
Derivative liabilities 2,084   991
Loans held for sale 9,519   10,367
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 231,276   404,522
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 55,522   51,929
Level 2 Inputs [Member] | Other securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 3,484   3,446
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 11,471   16,031
Level 3 Inputs [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgage servicing intangibles 500   638
Level 3 Inputs [Member] | Other securities [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Securities available for sale 12,741   9,827
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 $ 17,089