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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value $ 98,260 $ 68,948
Less Than 12 Months, Unrealized Losses 340 449
12 Months or More, Fair Value 13,991 10,921
12 Months or More, Unrealized Losses 216 114
Total, Fair Value 112,251 79,869
Total, Unrealized Losses 556 563
State and Municipals, Taxable [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or More, Fair Value 532 544
12 Months or More, Unrealized Losses 32 26
Total, Fair Value 532 544
Total, Unrealized Losses 32 26
State and Municipals, Tax-Exempt [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 21,341 4,702
Less Than 12 Months, Unrealized Losses 87 23
12 Months or More, Fair Value 1,952 2,423
12 Months or More, Unrealized Losses 19 39
Total, Fair Value 23,293 7,125
Total, Unrealized Losses 106 62
U.S. Treasuries [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 9,999  
Less Than 12 Months, Unrealized Losses 31  
Total, Fair Value 9,999  
Total, Unrealized Losses 31  
U.S. Government-Sponsored Enterprises State and Municipals [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 34,159 21,228
Less Than 12 Months, Unrealized Losses 62 33
12 Months or More, Fair Value   7,954
12 Months or More, Unrealized Losses   49
Total, Fair Value 34,159 29,182
Total, Unrealized Losses 62 82
Mortgage-Backed Securities, U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 15,114 20,148
Less Than 12 Months, Unrealized Losses 56 167
12 Months or More, Fair Value 5,477  
12 Months or More, Unrealized Losses 61  
Total, Fair Value 20,591 20,148
Total, Unrealized Losses 117 167
Mortgage-Backed Securities, U.S. Government-Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 17,647 22,870
Less Than 12 Months, Unrealized Losses 104 226
12 Months or More, Fair Value 6,030  
12 Months or More, Unrealized Losses 104  
Total, Fair Value 23,677 22,870
Total, Unrealized Losses $ 208 $ 226