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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | $ 245,289 | $ 280,342
Available-for-sale, Gross Unrealized Gains | 6,186 | 5,133
Available-for-sale, Gross Unrealized Losses | 93 | 540
Available-for-sale, Fair Value | 251,382 | 284,935
Held-to-maturity, Amortized Cost | 11,262 | 12,109
Held-to-maturity, Gross Unrealized Gains | 803 | 513
Held-to-maturity, Gross Unrealized Losses |  | 16
Held-to-maturity, Fair Value | 12,065 | 12,606
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 25,878 | 31,612
Available-for-sale, Gross Unrealized Gains | 189 | 73
Available-for-sale, Gross Unrealized Losses | 13 | 117
Available-for-sale, Fair Value | 26,054 | 31,568
Held-to-maturity, Amortized Cost | 76 | 84
Held-to-maturity, Gross Unrealized Gains | 2 | 1
Held-to-maturity, Fair Value | 78 | 85
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 27,316 | 32,928
Available-for-sale, Gross Unrealized Gains | 241 | 119
Available-for-sale, Gross Unrealized Losses | 78 | 208
Available-for-sale, Fair Value | 27,479 | 32,839
Held-to-maturity, Amortized Cost | 4,322 | 5,160
Held-to-maturity, Gross Unrealized Gains | 313 | 326
Held-to-maturity, Fair Value | 4,635 | 5,486
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 58,307 | 68,831
Available-for-sale, Gross Unrealized Gains | 438 | 291
Available-for-sale, Gross Unrealized Losses |  | 62
Available-for-sale, Fair Value | 58,745 | 69,060
U.S. Treasury securities |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost |  | 10,030
Available-for-sale, Gross Unrealized Losses |  | 31
Available-for-sale, Fair Value |  | 9,999
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 14,767 | 15,842
Available-for-sale, Gross Unrealized Gains | 1,182 | 735
Available-for-sale, Gross Unrealized Losses |  | 32
Available-for-sale, Fair Value | 15,949 | 16,545
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 119,021 | 121,099
Available-for-sale, Gross Unrealized Gains | 4,136 | 3,915
Available-for-sale, Gross Unrealized Losses | 2 | 90
Available-for-sale, Fair Value | 123,155 | 124,924
Held-to-maturity, Amortized Cost | 6,864 | 6,865
Held-to-maturity, Gross Unrealized Gains | 488 | 186
Held-to-maturity, Gross Unrealized Losses |  | 16
Held-to-maturity, Fair Value | $ 7,352 | $ 7,035

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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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