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Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities $ 550,158 $ 534,358
Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 550,158 534,358
Deferred compensation assets 3,861 3,625
Deferred compensation liabilities 3,861 3,625
Recurring | US Treasury Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 9,414  
Recurring | Municipal securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 151,981 159,217
Recurring | Single Issue Trust Preferred Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 46,182 44,646
Recurring | Agency Mortgage Backed Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 326,266 315,897
Recurring | Non Agency Alt Residential Mbs
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 10,884  
Recurring | Equity Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 5,431 3,531
Recurring | IRLCs
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 17 144
Derivative liabilities 163 16
Recurring | Non Agency Residential Mortgage Backed Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities   11,067
Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 5,413 3,511
Level 1 | Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 5,413 3,511
Deferred compensation assets 3,861 3,625
Deferred compensation liabilities 3,861 3,625
Level 1 | Recurring | Equity Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 5,413 3,511
Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 544,745 530,847
Derivatives 17 144
Derivative liabilities 163 16
Level 2 | Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 544,745 530,847
Level 2 | Recurring | US Treasury Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 9,414  
Level 2 | Recurring | Municipal securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 151,981 159,217
Level 2 | Recurring | Single Issue Trust Preferred Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 46,182 44,646
Level 2 | Recurring | Agency Mortgage Backed Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 326,266 315,897
Level 2 | Recurring | Non Agency Alt Residential Mbs
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 10,884  
Level 2 | Recurring | Equity Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 18 20
Level 2 | Recurring | IRLCs
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 17 144
Derivative liabilities 163 16
Level 2 | Recurring | Non Agency Residential Mortgage Backed Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities   $ 11,067