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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
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses $ 1,076 $ 1,949
Total, Fair Value 102,580 136,431
12 Months or More, Unrealized Losses 480 4
12 Months or More, Fair Value 25,590 3,114
Less Than 12 Months, Unrealized Losses 596 1,945
Less Than 12 Months, Fair Value 76,990 133,317
State and Municipals, Taxable [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 26 126
Total, Fair Value 548 10,621
12 Months or More, Unrealized Losses      
12 Months or More, Fair Value      
Less Than 12 Months, Unrealized Losses 26 126
Less Than 12 Months, Fair Value 548 10,621
State and Municipals, Tax-Exempt [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 411 1,157
Total, Fair Value 20,276 36,471
12 Months or More, Unrealized Losses 358   
12 Months or More, Fair Value 4,607   
Less Than 12 Months, Unrealized Losses 53 1,157
Less Than 12 Months, Fair Value 15,669 36,471
U.S. Government Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 1 3
Total, Fair Value 189 204
12 Months or More, Unrealized Losses      
12 Months or More, Fair Value      
Less Than 12 Months, Unrealized Losses 1 3
Less Than 12 Months, Fair Value 189 204
U.S. Government-Sponsored Enterprises State and Municipals [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 145 472
Total, Fair Value 38,007 69,505
12 Months or More, Unrealized Losses 122 4
12 Months or More, Fair Value 20,983 3,114
Less Than 12 Months, Unrealized Losses 23 468
Less Than 12 Months, Fair Value 17,024 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, Unrealized Losses      
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 224 63
Total, Fair Value 25,233 12,774
12 Months or More, Unrealized Losses      
12 Months or More, Fair Value      
Less Than 12 Months, Unrealized Losses 224 63
Less Than 12 Months, Fair Value 25,233 12,774
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 264 40
Total, Fair Value 18,255 5,624
12 Months or More, Unrealized Losses      
12 Months or More, Fair Value      
Less Than 12 Months, Unrealized Losses 264 40
Less Than 12 Months, Fair Value 18,255 5,624
Common Stock [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 5 10
Total, Fair Value 72 137
12 Months or More, Unrealized Losses      
12 Months or More, Fair Value      
Less Than 12 Months, Unrealized Losses 5 10
Less Than 12 Months, Fair Value $ 72 $ 137