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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | $ 273,785 | $ 258,857
Available-for-sale, Gross Unrealized Gains | 1,669 | 3,050
Available-for-sale, Gross Unrealized Losses | 2,906 | 2,497
Available-for-sale, Fair Value | 272,548 | 259,410
Held-to-maturity, Amortized Cost | 9,274 | 10,517
Held-to-maturity, Gross Unrealized Gains | 290 | 264
Held-to-maturity, Gross Unrealized Losses | 17 | 67
Held-to-maturity, Fair value | 9,547 | 10,714
State and Municipals Tax-exempt Bonds |  |
Available-for-sale and Held-to-maturity securities |  |
Held-to-maturity, Amortized Cost | 6,859 |
Held-to-maturity, Gross Unrealized Gains | 152 |
Held-to-maturity, Gross Unrealized Losses | 13 |
Held-to-maturity, Fair value | 6,998 |
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 14,517 | 21,041
Available-for-sale, Gross Unrealized Gains | 2 | 48
Available-for-sale, Gross Unrealized Losses | 85 | 47
Available-for-sale, Fair Value | 14,434 | 21,042
Held-to-maturity, Amortized Cost | 54 | 68
Held-to-maturity, Gross Unrealized Gains |  | 1
Held-to-maturity, Fair value | 54 | 69
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 19,752 | 22,303
Available-for-sale, Gross Unrealized Gains | 10 | 48
Available-for-sale, Gross Unrealized Losses | 231 | 159
Available-for-sale, Fair Value | 19,531 | 22,192
Held-to-maturity, Amortized Cost | 2,361 | 3,587
Held-to-maturity, Gross Unrealized Gains | 138 | 191
Held-to-maturity, Gross Unrealized Losses | 4 |
Held-to-maturity, Fair value | 2,495 | 3,778
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 6,315 |
Available-for-sale, Gross Unrealized Losses | 120 |
Available-for-sale, Fair Value | 6,195 |
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 95,358 | 82,314
Available-for-sale, Gross Unrealized Gains | 30 | 79
Available-for-sale, Gross Unrealized Losses | 1,740 | 1,480
Available-for-sale, Fair Value | 93,648 | 80,913
U.S. Treasuries |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 20,042 | 7,570
Available-for-sale, Gross Unrealized Losses | 228 | 132
Available-for-sale, Fair Value | 19,814 | 7,438
Common equity securities |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 43 |
Available-for-sale, Gross Unrealized Gains | 3 |
Available-for-sale, Fair Value | 46 |
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 14,559 | 14,698
Available-for-sale, Gross Unrealized Gains | 488 | 566
Available-for-sale, Gross Unrealized Losses |  | 39
Available-for-sale, Fair Value | 15,047 | 15,225
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 103,199 |
Available-for-sale, Gross Unrealized Gains | 1,136 |
Available-for-sale, Gross Unrealized Losses | 502 |
Available-for-sale, Fair Value | $ 103,833 |
Held-to-maturity, Amortized Cost |  | 6,862
Held-to-maturity, Gross Unrealized Gains |  | 72
Held-to-maturity, Gross Unrealized Losses |  | 67
Held-to-maturity, Fair value |  | 6,867
State and Municipals, Tax-exempt | Corporate bonds |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost |  | 110,931
Available-for-sale, Gross Unrealized Gains |  | 2,309
Available-for-sale, Gross Unrealized Losses |  | 640
Available-for-sale, Fair Value |  | $ 112,600

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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