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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details 5) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value $ 54,736 $ 68,948
Less Than 12 Months, Unrealized Losses 353 449
12 Months or More, Fair Value 13,136 10,921
12 Months or More, Unrealized Losses 159 114
Total, Fair Value 67,872 79,869
Total, Unrealized Losses 512 563
State and Municipals, Taxable [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or More, Fair Value 546 544
12 Months or More, Unrealized Losses 19 26
Total, Fair Value 546 544
Total, Unrealized Losses 19 26
State and Municipals, Tax-Exempt [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 41,034 4,702
Less Than 12 Months, Unrealized Losses 325 23
12 Months or More, Fair Value 789 2,423
12 Months or More, Unrealized Losses 27 39
Total, Fair Value 41,823 7,125
Total, Unrealized Losses 352 62
U.S. Government-Sponsored Enterprises State and Municipals [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 3,006 21,228
Less Than 12 Months, Unrealized Losses 1 33
12 Months or More, Fair Value   7,954
12 Months or More, Unrealized Losses   49
Total, Fair Value 3,006 29,182
Total, Unrealized Losses 1 82
Mortgage-Backed Securities, U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 877 20,148
Less Than 12 Months, Unrealized Losses 7 167
12 Months or More, Fair Value 5,119  
12 Months or More, Unrealized Losses 24  
Total, Fair Value 5,996 20,148
Total, Unrealized Losses 31 167
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 9,819 22,870
Less Than 12 Months, Unrealized Losses 20 226
12 Months or More, Fair Value 6,682  
12 Months or More, Unrealized Losses 89  
Total, Fair Value 16,501 22,870
Total, Unrealized Losses $ 109 $ 226