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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses $ 1,510 $ 1,949
Total, Fair Value 172,290 136,431
12 Months or More, Fair Value 25,716 3,114
Less Than 12 Months, Unrealized Losses 1,168 1,945
Less Than 12 Months, Fair Value 146,574 133,317
State and Municipals, Taxable [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 25 126
Total, Fair Value 1,599 10,621
12 Months or More, Fair Value      
Less Than 12 Months, Unrealized Losses 25 126
Less Than 12 Months, Fair Value 1,599 10,621
State and Municipals, Tax-Exempt [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 223 1,157
Total, Fair Value 13,193 36,471
12 Months or More, Fair Value 4,776   
Less Than 12 Months, Unrealized Losses 35 1,157
Less Than 12 Months, Fair Value 8,417 36,471
U.S. Treasury Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 296  
Total, Fair Value 48,061  
12 Months or More, Fair Value     
Less Than 12 Months, Unrealized Losses 296  
Less Than 12 Months, Fair Value 48,061  
U.S. Government-Sponsored Enterprises State and Municipals [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 228 472
Total, Fair Value 53,589 69,505
12 Months or More, Fair Value 20,940 3,114
Less Than 12 Months, Unrealized Losses 74 468
Less Than 12 Months, Fair Value 32,649 66,391
Corporate Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses    78
Total, Fair Value    1,095
12 Months or More, Fair Value      
Less Than 12 Months, Unrealized Losses    78
Less Than 12 Months, Fair Value    1,095
Mortgage-backed Securities, Issued by U.S. Government Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 287 66
Total, Fair Value 26,466 12,978
12 Months or More, Fair Value      
Less Than 12 Months, Unrealized Losses 287 66
Less Than 12 Months, Fair Value 26,466 12,978
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 451 40
Total, Fair Value 29,382 5,624
12 Months or More, Fair Value      
Less Than 12 Months, Unrealized Losses 451 40
Less Than 12 Months, Fair Value 29,382 5,624
Common Stock [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses    10
Total, Fair Value    137
12 Months or More, Fair Value      
Less Than 12 Months, Unrealized Losses    10
Less Than 12 Months, Fair Value    $ 137