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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, 2019 | Dec. 31, 2018
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Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | $ 2,214 | $ 25,905
12 Months or More, Fair Value | 167,699 | 189,472
Less Than 12 Months, Unrealized Losses | 4 | 132
12 Months or More, Unrealized Losses | 2,142 | 3,924
Total, Fair Value | 169,913 | 215,377
Total, Unrealized Losses | 2,146 | 4,056
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 1,854 | 9,022
12 Months or More, Fair Value | 31,468 | 52,352
Less Than 12 Months, Unrealized Losses | 3 | 74
12 Months or More, Unrealized Losses | 166 | 714
Total, Fair Value | 33,322 | 61,374
Total, Unrealized Losses | 169 | 788
U.S. Treasuries |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value |  | 1,995
12 Months or More, Fair Value | 19,799 | 19,671
Less Than 12 Months, Unrealized Losses |  | 2
12 Months or More, Unrealized Losses | 232 | 363
Total, Fair Value | 19,799 | 21,666
Total, Unrealized Losses | 232 | 365
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value |  | 2,037
12 Months or More, Fair Value | 90,466 | 89,729
Less Than 12 Months, Unrealized Losses |  | 1
12 Months or More, Unrealized Losses | 1,373 | 2,182
Total, Fair Value | 90,466 | 91,766
Total, Unrealized Losses | 1,373 | 2,183
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
12 Months or More, Fair Value | 6,946 | 7,800
12 Months or More, Unrealized Losses | 56 | 84
Total, Fair Value | 6,946 | 7,800
Total, Unrealized Losses | 56 | 84
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value | 360 |
12 Months or More, Fair Value | 12,873 | 6,039
Less Than 12 Months, Unrealized Losses | 1 |
12 Months or More, Unrealized Losses | 204 | 230
Total, Fair Value | 13,233 | 6,039
Total, Unrealized Losses | 205 | 230
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Fair Value |  | 12,851
12 Months or More, Fair Value | 6,147 | 13,881
Less Than 12 Months, Unrealized Losses |  | 55
12 Months or More, Unrealized Losses | 111 | 351
Total, Fair Value | 6,147 | 26,732
Total, Unrealized Losses | $ 111 | $ 406

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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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- 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 less 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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