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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 44,576 $ 98,260
Less Than 12 Months, Unrealized Losses 74 340
12 Months or More, Fair Value 9,983 13,991
12 Months or More, Unrealized Losses 130 216
Total, Fair Value 54,559 112,251
Total, Unrealized Losses 204 556
State and Municipals, Taxable    
Available-for-sale and Held-to-maturity securities    
12 Months or More, Fair Value 551 532
12 Months or More, Unrealized Losses 11 32
Total, Fair Value 551 532
Total, Unrealized Losses 11 32
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 14,675 21,341
Less Than 12 Months, Unrealized Losses 29 87
12 Months or More, Fair Value 1,366 1,952
12 Months or More, Unrealized Losses 5 19
Total, Fair Value 16,041 23,293
Total, Unrealized Losses 34 106
U.S. Treasury securities    
Available-for-sale and Held-to-maturity securities    
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    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 10,987 34,159
Less Than 12 Months, Unrealized Losses 7 62
Total, Fair Value 10,987 34,159
Total, Unrealized Losses 7 62
Mortgage-backed Securities, U.S. Government agencies    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 5,435 15,114
Less Than 12 Months, Unrealized Losses 11 56
12 Months or More, Fair Value 5,164 5,477
12 Months or More, Unrealized Losses 34 61
Total, Fair Value 10,599 20,591
Total, Unrealized Losses 45 117
Mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 13,479 17,647
Less Than 12 Months, Unrealized Losses 27 104
12 Months or More, Fair Value 2,902 6,030
12 Months or More, Unrealized Losses 80 104
Total, Fair Value 16,381 23,677
Total, Unrealized Losses $ 107 $ 208