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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
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses $ 1,342 $ 1,949
Total, Fair Value 125,280 136,431
12 Months or More, Unrealized Losses 53 4
12 Months or More, Fair Value 3,648 3,114
Less Than 12 Months, Unrealized Losses 1,289 1,945
Less Than 12 Months, Fair Value 121,632 133,317
U.S. Government Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 2 3
Total, Fair Value 203 204
12 Months or More, Unrealized Losses      
12 Months or More, Fair Value      
Less Than 12 Months, Unrealized Losses 2 3
Less Than 12 Months, Fair Value 203 204
U.S. Government-Sponsored Enterprises [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 288 472
Total, Fair Value 60,352 69,505
12 Months or More, Unrealized Losses 2 4
12 Months or More, Fair Value 3,102 3,114
Less Than 12 Months, Unrealized Losses 286 468
Less Than 12 Months, Fair Value 57,250 66,391
State and Municipals, Taxable [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 35 126
Total, Fair Value 3,646 10,621
12 Months or More, Unrealized Losses      
12 Months or More, Fair Value      
Less Than 12 Months, Unrealized Losses 35 126
Less Than 12 Months, Fair Value 3,646 10,621
State and Municipals, Tax-Exempt [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 594 1,157
Total, Fair Value 27,855 36,471
12 Months or More, Unrealized Losses 51   
12 Months or More, Fair Value 546   
Less Than 12 Months, Unrealized Losses 543 1,157
Less Than 12 Months, Fair Value 27,309 36,471
Corporate Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 69 78
Total, Fair Value 1,094 1,095
12 Months or More, Unrealized Losses      
12 Months or More, Fair Value      
Less Than 12 Months, Unrealized Losses 69 78
Less Than 12 Months, Fair Value 1,094 1,095
Mortgage-backed Securities, Issued by U.S. Government Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 278 63
Total, Fair Value 22,474 12,774
12 Months or More, Unrealized Losses      
12 Months or More, Fair Value      
Less Than 12 Months, Unrealized Losses 278 63
Less Than 12 Months, Fair Value 22,474 12,774
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 70 40
Total, Fair Value 9,586 5,624
12 Months or More, Unrealized Losses      
12 Months or More, Fair Value      
Less Than 12 Months, Unrealized Losses 70 40
Less Than 12 Months, Fair Value 9,586 5,624
Common Stock [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 6 10
Total, Fair Value 70 137
12 Months or More, Unrealized Losses      
12 Months or More, Fair Value      
Less Than 12 Months, Unrealized Losses 6 10
Less Than 12 Months, Fair Value $ 70 $ 137