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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
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities $ 534,358 $ 482,430
Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 534,358 482,430
Deferred compensation assets 3,625 3,210
Deferred compensation liabilities 3,625 3,210
Recurring | Municipal securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 159,217 137,815
Recurring | Single Issue Trust Preferred Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 44,646 40,244
Recurring | Corporate FDIC Insured Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities   13,718
Recurring | Agency Mortgage Backed Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 315,897 280,102
Recurring | Non Agency Alt Residential Mbs
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 11,067  
Recurring | Equity Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 3,531 521
Recurring | IRLCs
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 144 135
Derivative liabilities 16 6
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   10,030
Level 1 | Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 3,511 501
Deferred compensation assets 3,625 3,210
Deferred compensation liabilities 3,625 3,210
Level 1 | Recurring | Equity Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 3,511 501
Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 534,358  
Derivatives 144  
Derivative liabilities 16  
Level 2 | Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 530,847 481,929
Level 2 | Recurring | Municipal securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 159,217 137,815
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 44,646 40,244
Level 2 | Recurring | Corporate FDIC Insured Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities   13,718
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 315,897 280,102
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 11,067  
Level 2 | Recurring | Equity Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total available-for-sale securities 20 20
Level 2 | Recurring | IRLCs
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 144 135
Derivative liabilities 16 6
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   $ 10,030