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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | $ 105,872 | $ 139,450
12 Months or More, Fair Value | 132,381 | 68,109
Less Than 12 Months, Unrealized Losses | 1,754 | 1,331
12 Months or More, Unrealized Losses | 4,800 | 1,592
Total, Fair Value | 238,253 | 207,559
Total, Unrealized Losses | 6,554 | 2,923
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 52,220 | 54,788
12 Months or More, Fair Value | 14,529 | 3,808
Less Than 12 Months, Unrealized Losses | 893 | 454
12 Months or More, Unrealized Losses | 353 | 61
Total, Fair Value | 66,749 | 58,596
Total, Unrealized Losses | 1,246 | 515
U.S. Treasuries |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 8,711 | 17,350
12 Months or More, Fair Value | 16,519 | 2,464
Less Than 12 Months, Unrealized Losses | 169 | 170
12 Months or More, Unrealized Losses | 542 | 58
Total, Fair Value | 25,230 | 19,814
Total, Unrealized Losses | 711 | 228
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 16,813 | 39,096
12 Months or More, Fair Value | 74,959 | 51,365
Less Than 12 Months, Unrealized Losses | 337 | 445
12 Months or More, Unrealized Losses | 2,980 | 1,295
Total, Fair Value | 91,772 | 90,461
Total, Unrealized Losses | 3,317 | 1,740
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 6,423 | 9,484
12 Months or More, Fair Value | 7,162 | 3,968
Less Than 12 Months, Unrealized Losses | 33 | 39
12 Months or More, Unrealized Losses | 101 | 46
Total, Fair Value | 13,585 | 13,452
Total, Unrealized Losses | 134 | 85
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 21,705 | 6,195
12 Months or More, Fair Value | 13,261 |
Less Than 12 Months, Unrealized Losses | 322 | 120
12 Months or More, Unrealized Losses | 494 |
Total, Fair Value | 34,966 | 6,195
Total, Unrealized Losses | 816 | 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
12 Months or More, Fair Value | 5,951 | 6,504
Less Than 12 Months, Unrealized Losses |  | 103
12 Months or More, Unrealized Losses | 330 | 132
Total, Fair Value | 5,951 | 19,041
Total, Unrealized Losses | $ 330 | $ 235

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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