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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value $ 78,485 $ 68,948
Less Than 12 Months, Unrealized Losses 765 449
12 Months or More, Fair Value 10,454 10,921
12 Months or More, Unrealized Losses 190 114
Total, Fair Value 88,939 79,869
Total, Unrealized Losses 955 563
State and Municipals, Taxable [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or More, Fair Value 545 544
12 Months or More, Unrealized Losses 22 26
Total, Fair Value 545 544
Total, Unrealized Losses 22 26
State and Municipals, Tax-Exempt [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 44,196 4,702
Less Than 12 Months, Unrealized Losses 636 23
12 Months or More, Fair Value 786 2,423
12 Months or More, Unrealized Losses 30 39
Total, Fair Value 44,982 7,125
Total, Unrealized Losses 666 62
U.S. Treasury Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 10,044  
Less Than 12 Months, Unrealized Losses 30  
Total, Fair Value 10,044  
Total, Unrealized Losses 30  
U.S. Government-Sponsored Enterprises State and Municipals [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 3,003 21,228
Less Than 12 Months, Unrealized Losses 5 33
12 Months or More, Fair Value   7,954
12 Months or More, Unrealized Losses   49
Total, Fair Value 3,003 29,182
Total, Unrealized Losses 5 82
Mortgage-Backed Securities, U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 7,457 20,148
Less Than 12 Months, Unrealized Losses 26 167
12 Months or More, Fair Value 5,402  
12 Months or More, Unrealized Losses 36  
Total, Fair Value 12,859 20,148
Total, Unrealized Losses 62 167
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 13,785 22,870
Less Than 12 Months, Unrealized Losses 68 226
12 Months or More, Fair Value 3,721  
12 Months or More, Unrealized Losses 102  
Total, Fair Value 17,506 22,870
Total, Unrealized Losses $ 170 $ 226