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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, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | $ 139,450 | $ 145,428
Less Than 12 Months, Unrealized Losses | 1,331 | 2,470
12 Months or More, Fair Value | 68,109 | 4,434
12 Months or More, Unrealized Losses | 1,592 | 94
Total, Fair Value | 207,559 | 149,862
Total, Unrealized Losses | 2,923 | 2,564
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value |  | 1,035
Less Than 12 Months, Unrealized Losses |  | 39
Total, Fair Value |  | 1,035
Total, Unrealized Losses |  | 39
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 54,788 | 55,166
Less Than 12 Months, Unrealized Losses | 454 | 707
12 Months or More, Fair Value | 3,808 | 226
12 Months or More, Unrealized Losses | 61 |
Total, Fair Value | 58,596 | 55,392
Total, Unrealized Losses | 515 | 707
U.S. Treasuries |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 17,350 | 7,438
Less Than 12 Months, Unrealized Losses | 170 | 132
12 Months or More, Fair Value | 2,464 |
12 Months or More, Unrealized Losses | 58 |
Total, Fair Value | 19,814 | 7,438
Total, Unrealized Losses | 228 | 132
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 39,096 | 59,460
Less Than 12 Months, Unrealized Losses | 445 | 1,480
12 Months or More, Fair Value | 51,365 |
12 Months or More, Unrealized Losses | 1,295 |
Total, Fair Value | 90,461 | 59,460
Total, Unrealized Losses | 1,740 | 1,480
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 9,484 | 5,917
Less Than 12 Months, Unrealized Losses | 39 | 27
12 Months or More, Fair Value | 3,968 | 1,496
12 Months or More, Unrealized Losses | 46 | 20
Total, Fair Value | 13,452 | 7,413
Total, Unrealized Losses | 85 | 47
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 6,195 |
Less Than 12 Months, Unrealized Losses | 120 |
Total, Fair Value | 6,195 |
Total, Unrealized Losses | 120 |
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 12,537 | 16,412
Less Than 12 Months, Unrealized Losses | 103 | 85
12 Months or More, Fair Value | 6,504 | 2,712
12 Months or More, Unrealized Losses | 132 | 74
Total, Fair Value | 19,041 | 19,124
Total, Unrealized Losses | $ 235 | $ 159

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