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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
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
U.S. Government-agencies $ 203 $ 204
U.S. Government-sponsored enterprises 107,893 113,045
State and Municipals:    
Taxable 16,929 16,698
Tax-exempt 97,212 98,081
Corporate debt securities 4,374 4,387
Mortgage-backed securities:    
U.S. Government agencies 29,655 20,229
U.S. Government-sponsored enterprises 44,867 45,974
Common equity securities 1,093 1,097
Total 302,226 299,715
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. Government-agencies      
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 1,093 1,097
Total 1,093 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-agencies 203 204
U.S. Government-sponsored enterprises 107,893 113,045
State and Municipals:    
Taxable 16,929 16,698
Tax-exempt 97,212 98,081
Corporate debt securities 4,374 4,387
Mortgage-backed securities:    
U.S. Government agencies 29,655 20,229
U.S. Government-sponsored enterprises 44,867 45,974
Common equity securities      
Total 301,133 298,618
Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
U.S. Government-agencies      
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