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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 98,864 $ 145,428
Less Than 12 Months, Unrealized Losses 967 2,470
12 Months or More, Fair Value 6,897 4,434
12 Months or More, Unrealized Losses 106 94
Total, Fair Value 105,761 149,862
Total, Unrealized Losses 1,073 2,564
State and Municipals, Taxable    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 554 1,035
Less Than 12 Months, Unrealized Losses 1 39
Total, Fair Value 554 1,035
Total, Unrealized Losses 1 39
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 15,898 55,166
Less Than 12 Months, Unrealized Losses 62 707
12 Months or More, Fair Value   226
Total, Fair Value 15,898 55,392
Total, Unrealized Losses 62 707
U.S. Treasuries    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 2,501 7,438
Less Than 12 Months, Unrealized Losses 23 132
Total, Fair Value 2,501 7,438
Total, Unrealized Losses 23 132
U.S. Government-sponsored enterprises state and municipals    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 65,845 59,460
Less Than 12 Months, Unrealized Losses 823 1,480
12 Months or More, Fair Value 1,067  
12 Months or More, Unrealized Losses 24  
Total, Fair Value 66,912 59,460
Total, Unrealized Losses 847 1,480
Mortgage-backed Securities, U.S. Government agencies    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 2,848 5,917
Less Than 12 Months, Unrealized Losses 8 27
12 Months or More, Fair Value 3,503 1,496
12 Months or More, Unrealized Losses 21 20
Total, Fair Value 6,351 7,413
Total, Unrealized Losses 29 47
Mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 11,218 16,412
Less Than 12 Months, Unrealized Losses 50 85
12 Months or More, Fair Value 2,327 2,712
12 Months or More, Unrealized Losses 61 74
Total, Fair Value 13,545 19,124
Total, Unrealized Losses $ 111 $ 159