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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, 2018 | Dec. 31, 2017
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Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | $ 163,696 | $ 139,450
12 Months or More, Fair Value | 67,289 | 68,109
Less Than 12 Months, Unrealized Losses | 3,171 | 1,331
12 Months or More, Unrealized Losses | 2,433 | 1,592
Total, Fair Value | 230,985 | 207,559
Total, Unrealized Losses | 5,604 | 2,923
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 61,299 | 54,788
12 Months or More, Fair Value | 3,956 | 3,808
Less Than 12 Months, Unrealized Losses | 820 | 454
12 Months or More, Unrealized Losses | 111 | 61
Total, Fair Value | 65,255 | 58,596
Total, Unrealized Losses | 931 | 515
U.S. Treasuries |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 22,935 | 17,350
12 Months or More, Fair Value | 2,412 | 2,464
Less Than 12 Months, Unrealized Losses | 479 | 170
12 Months or More, Unrealized Losses | 108 | 58
Total, Fair Value | 25,347 | 19,814
Total, Unrealized Losses | 587 | 228
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 41,517 | 39,096
12 Months or More, Fair Value | 50,531 | 51,365
Less Than 12 Months, Unrealized Losses | 1,142 | 445
12 Months or More, Unrealized Losses | 1,989 | 1,295
Total, Fair Value | 92,048 | 90,461
Total, Unrealized Losses | 3,131 | 1,740
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 11,211 | 9,484
12 Months or More, Fair Value | 4,328 | 3,968
Less Than 12 Months, Unrealized Losses | 44 | 39
12 Months or More, Unrealized Losses | 65 | 46
Total, Fair Value | 15,539 | 13,452
Total, Unrealized Losses | 109 | 85
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 5,973 | 6,195
Less Than 12 Months, Unrealized Losses | 319 | 120
Total, Fair Value | 5,973 | 6,195
Total, Unrealized Losses | 319 | 120
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 20,761 | 12,537
12 Months or More, Fair Value | 6,062 | 6,504
Less Than 12 Months, Unrealized Losses | 367 | 103
12 Months or More, Unrealized Losses | 160 | 132
Total, Fair Value | 26,823 | 19,041
Total, Unrealized Losses | $ 527 | $ 235

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