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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
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses $ 1,949 $ 13
Total, Fair Value 136,431 3,358
12 Months or More, Unrealized Losses 4 2
12 Months or More, Fair Value 3,114 48
Less than 12 Months, Unrealized Losses 1,945 11
Less than 12 Months, Fair Value 133,317 3,310
U.S. Government Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 3   
Total, Fair Value 204   
12 Months or More, Unrealized Losses      
12 Months or More, Fair Value      
Less than 12 Months, Unrealized Losses 3   
Less than 12 Months, Fair Value 204   
U.S. Government-Sponsored Enterprises [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 472 2
Total, Fair Value 69,505 3,169
12 Months or More, Unrealized Losses 4   
12 Months or More, Fair Value 3,114   
Less than 12 Months, Unrealized Losses 468 2
Less than 12 Months, Fair Value 66,391 3,169
State and Municipals, Taxable [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 126   
Total, Fair Value 10,621   
12 Months or More, Unrealized Losses      
12 Months or More, Fair Value      
Less than 12 Months, Unrealized Losses 126   
Less than 12 Months, Fair Value 10,621   
State and Municipals, Tax-exempt [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 1,157   
Total, Fair Value 36,471   
12 Months or More, Unrealized Losses      
12 Months or More, Fair Value      
Less than 12 Months, Unrealized Losses 1,157   
Less than 12 Months, Fair Value 36,471   
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 63   
Total, Fair Value 12,774   
12 Months or More, Unrealized Losses      
12 Months or More, Fair Value      
Less than 12 Months, Unrealized Losses 63   
Less than 12 Months, Fair Value 12,774   
Mortgage-backed Securities, U.S. Government-Sponsored Enterprises [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 40   
Total, Fair Value 5,624   
12 Months or More, Unrealized Losses      
12 Months or More, Fair Value      
Less than 12 Months, Unrealized Losses 40   
Less than 12 Months, Fair Value 5,624   
Common Stock [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total, Unrealized Losses 10 11
Total, Fair Value 137 189
12 Months or More, Unrealized Losses    2
12 Months or More, Fair Value    48
Less than 12 Months, Unrealized Losses 10 9
Less than 12 Months, Fair Value $ 137 $ 141