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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, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | $ 151,815 | $ 139,450
12 Months or More, Fair Value | 66,322 | 68,109
Less Than 12 Months, Unrealized Losses | 2,734 | 1,331
12 Months or More, Unrealized Losses | 2,204 | 1,592
Total, Fair Value | 218,137 | 207,559
Total, Unrealized Losses | 4,938 | 2,923
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 61,928 | 54,788
12 Months or More, Fair Value | 4,109 | 3,808
Less Than 12 Months, Unrealized Losses | 844 | 454
12 Months or More, Unrealized Losses | 88 | 61
Total, Fair Value | 66,037 | 58,596
Total, Unrealized Losses | 932 | 515
U.S. Treasuries |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 19,143 | 17,350
12 Months or More, Fair Value | 2,429 | 2,464
Less Than 12 Months, Unrealized Losses | 366 | 170
12 Months or More, Unrealized Losses | 92 | 58
Total, Fair Value | 21,572 | 19,814
Total, Unrealized Losses | 458 | 228
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 39,607 | 39,096
12 Months or More, Fair Value | 50,763 | 51,365
Less Than 12 Months, Unrealized Losses | 950 | 445
12 Months or More, Unrealized Losses | 1,827 | 1,295
Total, Fair Value | 90,370 | 90,461
Total, Unrealized Losses | 2,777 | 1,740
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 9,190 | 9,484
12 Months or More, Fair Value | 3,592 | 3,968
Less Than 12 Months, Unrealized Losses | 54 | 39
12 Months or More, Unrealized Losses | 52 | 46
Total, Fair Value | 12,782 | 13,452
Total, Unrealized Losses | 106 | 85
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 6,303 | 6,195
Less Than 12 Months, Unrealized Losses | 263 | 120
Total, Fair Value | 6,303 | 6,195
Total, Unrealized Losses | 263 | 120
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 15,644 | 12,537
12 Months or More, Fair Value | 5,429 | 6,504
Less Than 12 Months, Unrealized Losses | 257 | 103
12 Months or More, Unrealized Losses | 145 | 132
Total, Fair Value | 21,073 | 19,041
Total, Unrealized Losses | $ 402 | $ 235

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