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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | $ 257,508 | $ 258,857
Available-for-sale, Gross Unrealized Gains | 2,839 | 3,050
Available-for-sale, Gross Unrealized Losses | 1,209 | 2,497
Available-for-sale, Fair Value | 259,138 | 259,410
Held-to-maturity, Amortized Cost | 9,564 | 10,517
Held-to-maturity, Gross Unrealized Gains | 350 | 264
Held-to-maturity, Gross Unrealized Losses | 2 | 67
Held-to-maturity, Fair value | 9,912 | 10,714
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 16,045 | 21,041
Available-for-sale, Gross Unrealized Gains | 21 | 48
Available-for-sale, Gross Unrealized Losses | 33 | 47
Available-for-sale, Fair Value | 16,033 | 21,042
Held-to-maturity, Amortized Cost | 58 | 68
Held-to-maturity, Gross Unrealized Gains |  | 1
Held-to-maturity, Fair value | 58 | 69
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 16,492 | 22,303
Available-for-sale, Gross Unrealized Gains | 29 | 48
Available-for-sale, Gross Unrealized Losses | 95 | 159
Available-for-sale, Fair Value | 16,426 | 22,192
Held-to-maturity, Amortized Cost | 2,647 | 3,587
Held-to-maturity, Gross Unrealized Gains | 165 | 191
Held-to-maturity, Fair value | 2,812 | 3,778
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 6,326 |
Available-for-sale, Gross Unrealized Losses | 85 |
Available-for-sale, Fair Value | 6,241 |
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 85,482 | 82,314
Available-for-sale, Gross Unrealized Gains | 83 | 79
Available-for-sale, Gross Unrealized Losses | 915 | 1,480
Available-for-sale, Fair Value | 84,650 | 80,913
U.S. Treasuries |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 20,045 | 7,570
Available-for-sale, Gross Unrealized Gains | 29 |
Available-for-sale, Gross Unrealized Losses | 28 | 132
Available-for-sale, Fair Value | 20,046 | 7,438
Common Stock |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 30 |
Available-for-sale, Fair Value | 30 |
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 14,594 | 14,698
Available-for-sale, Gross Unrealized Gains | 615 | 566
Available-for-sale, Gross Unrealized Losses | 2 | 39
Available-for-sale, Fair Value | 15,207 | 15,225
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 98,494 | 110,931
Available-for-sale, Gross Unrealized Gains | 2,062 | 2,309
Available-for-sale, Gross Unrealized Losses | 51 | 640
Available-for-sale, Fair Value | 100,505 | 112,600
Held-to-maturity, Amortized Cost | 6,859 | 6,862
Held-to-maturity, Gross Unrealized Gains | 185 | 72
Held-to-maturity, Gross Unrealized Losses | 2 | 67
Held-to-maturity, Fair value | $ 7,042 | $ 6,867

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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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