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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | $ 263,818 | $ 258,857
Available-for-sale, Gross Unrealized Gains | 2,874 | 3,050
Available-for-sale, Gross Unrealized Losses | 2,048 | 2,497
Available-for-sale, Fair Value | 264,644 | 259,410
Held-to-maturity, Amortized Cost | 10,180 | 10,517
Held-to-maturity, Gross Unrealized Gains | 262 | 264
Held-to-maturity, Gross Unrealized Losses | 83 | 67
Held-to-maturity, Fair value | 10,359 | 10,714
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 19,321 | 21,041
Available-for-sale, Gross Unrealized Gains | 47 | 48
Available-for-sale, Gross Unrealized Losses | 36 | 47
Available-for-sale, Fair Value | 19,332 | 21,042
Held-to-maturity, Amortized Cost | 64 | 68
Held-to-maturity, Gross Unrealized Gains |  | 1
Held-to-maturity, Fair value | 64 | 69
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 20,213 | 22,303
Available-for-sale, Gross Unrealized Gains | 46 | 48
Available-for-sale, Gross Unrealized Losses | 118 | 159
Available-for-sale, Fair Value | 20,141 | 22,192
Held-to-maturity, Amortized Cost | 3,255 | 3,587
Held-to-maturity, Gross Unrealized Gains | 176 | 191
Held-to-maturity, Fair value | 3,431 | 3,778
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 83,677 | 82,314
Available-for-sale, Gross Unrealized Gains | 72 | 79
Available-for-sale, Gross Unrealized Losses | 1,277 | 1,480
Available-for-sale, Fair Value | 82,472 | 80,913
U.S. Treasury securities |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 20,050 | 7,570
Available-for-sale, Gross Unrealized Gains | 1 |
Available-for-sale, Gross Unrealized Losses | 156 | 132
Available-for-sale, Fair Value | 19,895 | 7,438
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 14,663 | 14,698
Available-for-sale, Gross Unrealized Gains | 604 | 566
Available-for-sale, Gross Unrealized Losses |  | 39
Available-for-sale, Fair Value | 15,267 | 15,225
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 105,894 | 110,931
Available-for-sale, Gross Unrealized Gains | 2,104 | 2,309
Available-for-sale, Gross Unrealized Losses | 461 | 640
Available-for-sale, Fair Value | 107,537 | 112,600
Held-to-maturity, Amortized Cost | 6,861 | 6,862
Held-to-maturity, Gross Unrealized Gains | 86 | 72
Held-to-maturity, Gross Unrealized Losses | 83 | 67
Held-to-maturity, Fair value | $ 6,864 | $ 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=27724398&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=27724398&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 after other than temporary impairment (OTTI) accretion, of 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 (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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=27724398&loc=d3e27232-111563 + Details
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