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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | $ 258,829 | $ 280,342
Available-for-sale, Gross Unrealized Gains | 5,549 | 5,133
Available-for-sale, Gross Unrealized Losses | 203 | 540
Available-for-sale, Fair Value | 264,175 | 284,935
Held-to-maturity, Amortized Cost | 11,681 | 12,109
Held-to-maturity, Gross Unrealized Gains | 642 | 513
Held-to-maturity, Gross Unrealized Losses | 1 | 16
Held-to-maturity, Fair Value | 12,322 | 12,606
Mortgage-backed Securities, U.S. Government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 29,156 | 31,612
Available-for-sale, Gross Unrealized Gains | 97 | 73
Available-for-sale, Gross Unrealized Losses | 45 | 117
Available-for-sale, Fair Value | 29,208 | 31,568
Held-to-maturity, Amortized Cost | 81 | 84
Held-to-maturity, Gross Unrealized Gains | 1 | 1
Held-to-maturity, Fair Value | 82 | 85
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 30,078 | 32,928
Available-for-sale, Gross Unrealized Gains | 145 | 119
Available-for-sale, Gross Unrealized Losses | 107 | 208
Available-for-sale, Fair Value | 30,116 | 32,839
Held-to-maturity, Amortized Cost | 4,736 | 5,160
Held-to-maturity, Gross Unrealized Gains | 308 | 326
Held-to-maturity, Fair Value | 5,044 | 5,486
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 64,562 | 68,831
Available-for-sale, Gross Unrealized Gains | 499 | 291
Available-for-sale, Gross Unrealized Losses | 7 | 62
Available-for-sale, Fair Value | 65,054 | 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 | 14,801 | 15,842
Available-for-sale, Gross Unrealized Gains | 993 | 735
Available-for-sale, Gross Unrealized Losses | 11 | 32
Available-for-sale, Fair Value | 15,783 | 16,545
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Available-for-sale, Amortized Cost | 120,232 | 121,099
Available-for-sale, Gross Unrealized Gains | 3,815 | 3,915
Available-for-sale, Gross Unrealized Losses | 33 | 90
Available-for-sale, Fair Value | 124,014 | 124,924
Held-to-maturity, Amortized Cost | 6,864 | 6,865
Held-to-maturity, Gross Unrealized Gains | 333 | 186
Held-to-maturity, Gross Unrealized Losses | 1 | 16
Held-to-maturity, Fair Value | $ 7,196 | $ 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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