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Fair value estimates - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Recurring Fair Value Measurements [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
U.S. Treasury securities $ 48,061  
U.S. Government-sponsored enterprises 101,252 113,045
State and Municipals:    
Taxable 17,236 16,698
Tax-exempt 94,106 98,081
Corporate debt securities   4,387
Mortgage-backed securities:    
U.S. Government agencies 39,511 20,433
U.S. Government-sponsored enterprises 50,659 45,974
Common equity securities   1,097
Total 350,825 299,715
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
U.S. Treasury securities 48,061  
U.S. Government-sponsored enterprises     
State and Municipals:    
Taxable     
Tax-exempt     
Corporate debt securities     
Mortgage-backed securities:    
U.S. Government agencies     
U.S. Government-sponsored enterprises     
Common equity securities    1,097
Total 48,061 1,097
Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
U.S. Government-sponsored enterprises 101,252 113,045
State and Municipals:    
Taxable 17,236 16,698
Tax-exempt 94,106 98,081
Corporate debt securities    4,387
Mortgage-backed securities:    
U.S. Government agencies 39,511 20,433
U.S. Government-sponsored enterprises 50,659 45,974
Common equity securities     
Total 302,764 298,618
Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
U.S. Government-sponsored enterprises     
State and Municipals:    
Taxable     
Tax-exempt     
Corporate debt securities     
Mortgage-backed securities:    
U.S. Government agencies     
U.S. Government-sponsored enterprises     
Common equity securities     
Total