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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | $ 254,764 | $ 258,857
Available-for-sale, Gross Unrealized Gains | 3,080 | 3,050
Available-for-sale, Gross Unrealized Losses | 1,070 | 2,497
Available-for-sale, Fair Value | 256,774 | 259,410
Held-to-maturity, Amortized Cost | 9,868 | 10,517
Held-to-maturity, Gross Unrealized Gains | 356 | 264
Held-to-maturity, Gross Unrealized Losses | 3 | 67
Held-to-maturity, Fair value | 10,221 | 10,714
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 17,576 | 21,041
Available-for-sale, Gross Unrealized Gains | 31 | 48
Available-for-sale, Gross Unrealized Losses | 29 | 47
Available-for-sale, Fair Value | 17,578 | 21,042
Held-to-maturity, Amortized Cost | 61 | 68
Held-to-maturity, Gross Unrealized Gains |  | 1
Held-to-maturity, Fair value | 61 | 69
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 18,280 | 22,303
Available-for-sale, Gross Unrealized Gains | 39 | 48
Available-for-sale, Gross Unrealized Losses | 111 | 159
Available-for-sale, Fair Value | 18,208 | 22,192
Held-to-maturity, Amortized Cost | 2,947 | 3,587
Held-to-maturity, Gross Unrealized Gains | 193 | 191
Held-to-maturity, Fair value | 3,140 | 3,778
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 81,495 | 82,314
Available-for-sale, Gross Unrealized Gains | 96 | 79
Available-for-sale, Gross Unrealized Losses | 847 | 1,480
Available-for-sale, Fair Value | 80,744 | 80,913
U.S. Treasuries |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 20,047 | 7,570
Available-for-sale, Gross Unrealized Gains | 56 |
Available-for-sale, Gross Unrealized Losses | 23 | 132
Available-for-sale, Fair Value | 20,080 | 7,438
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 14,629 | 14,698
Available-for-sale, Gross Unrealized Gains | 667 | 566
Available-for-sale, Gross Unrealized Losses | 1 | 39
Available-for-sale, Fair Value | 15,295 | 15,225
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 102,737 | 110,931
Available-for-sale, Gross Unrealized Gains | 2,191 | 2,309
Available-for-sale, Gross Unrealized Losses | 59 | 640
Available-for-sale, Fair Value | 104,869 | 112,600
Held-to-maturity, Amortized Cost | 6,860 | 6,862
Held-to-maturity, Gross Unrealized Gains | 163 | 72
Held-to-maturity, Gross Unrealized Losses | 3 | 67
Held-to-maturity, Fair value | $ 7,020 | $ 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 This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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- Definition Amount of accumulated unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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