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Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale, at fair value $ 529,396 $ 516,190
Derivative assets 2,903 6,124
Derivative liabilities 1,602 4,756
Loans held for sale 13,587 9,433
Mortgage servicing intangibles 384 450
Level 2 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 2,903 6,124
Derivative liabilities 1,602 4,756
Loans held for sale 13,587 9,433
Level 3 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing intangibles 384 450
U.S. Treasuries [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale, at fair value 280,985 248,993
U.S. Treasuries [Member] | Level 1 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale, at fair value 280,985 248,993
U.S. Federal Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale, at fair value 166,117 172,449
U.S. Federal Agencies [Member] | Level 2 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale, at fair value 166,117 172,449
Mortgage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale, at fair value 23,770 26,457
Mortgage Backed Securities [Member] | Level 2 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale, at fair value 8,313 9,425
Mortgage Backed Securities [Member] | Level 3 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale, at fair value 15,457 17,032
States and Political Subdivisions [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale, at fair value 48,977 53,373
States and Political Subdivisions [Member] | Level 2 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale, at fair value 48,977 53,373
Other Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale, at fair value 9,547 14,918
Other Securities [Member] | Level 2 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale, at fair value 3,455 3,491
Other Securities [Member] | Level 3 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale, at fair value $ 6,092 $ 11,427