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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost |  | $ 273,785
Available-for-sale, Gross Unrealized Gains |  | 1,669
Available-for-sale, Gross Unrealized Losses |  | 2,906
Available-for-sale, Fair Value |  | 272,548
Available-for-sale, Amortized Cost | $ 274,990 |
Available-for-sale, Gross Unrealized Gains | 1,264 |
Available-for-sale, Gross Unrealized Losses | 4,876 |
Available-for-sale, Fair Value | 271,378 | 272,548
Held-to-maturity, Amortized Cost | 9,028 | 9,274
Held-to-maturity, Gross Unrealized Gains | 138 | 290
Held-to-maturity, Gross Unrealized Losses | 62 | 17
Held-to-maturity, Fair value | 9,104 | 9,547
Equity investments carried at fair value | 189 |
Mortgage-backed Securities, U.S. Government agencies |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost |  | 14,517
Available-for-sale, Gross Unrealized Gains |  | 2
Available-for-sale, Gross Unrealized Losses |  | 85
Available-for-sale, Fair Value |  | 14,434
Available-for-sale, Amortized Cost | 13,135 |
Available-for-sale, Gross Unrealized Gains | 1 |
Available-for-sale, Gross Unrealized Losses | 106 |
Available-for-sale, Fair Value | 13,030 |
Held-to-maturity, Amortized Cost | 51 | 54
Held-to-maturity, Fair value | 51 | 54
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost |  | 19,752
Available-for-sale, Gross Unrealized Gains |  | 10
Available-for-sale, Gross Unrealized Losses |  | 231
Available-for-sale, Fair Value |  | 19,531
Available-for-sale, Amortized Cost | 22,127 |
Available-for-sale, Gross Unrealized Gains | 3 |
Available-for-sale, Gross Unrealized Losses | 397 |
Available-for-sale, Fair Value | 21,733 |
Held-to-maturity, Amortized Cost | 2,119 | 2,361
Held-to-maturity, Gross Unrealized Gains | 114 | 138
Held-to-maturity, Gross Unrealized Losses | 5 | 4
Held-to-maturity, Fair value | 2,228 | 2,495
Commercial mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost |  | 6,315
Available-for-sale, Gross Unrealized Losses |  | 120
Available-for-sale, Fair Value |  | 6,195
Available-for-sale, Amortized Cost | 6,303 |
Available-for-sale, Gross Unrealized Losses | 263 |
Available-for-sale, Fair Value | 6,040 |
U.S. Government-sponsored enterprises state and municipals |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost |  | 95,358
Available-for-sale, Gross Unrealized Gains |  | 30
Available-for-sale, Gross Unrealized Losses |  | 1,740
Available-for-sale, Fair Value |  | 93,648
Available-for-sale, Amortized Cost | 95,268 |
Available-for-sale, Gross Unrealized Gains | 6 |
Available-for-sale, Gross Unrealized Losses | 2,777 |
Available-for-sale, Fair Value | 92,497 |
U.S. Treasuries |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost |  | 20,042
Available-for-sale, Gross Unrealized Losses |  | 228
Available-for-sale, Fair Value |  | 19,814
Available-for-sale, Amortized Cost | 25,927 |
Available-for-sale, Gross Unrealized Gains | 7 |
Available-for-sale, Gross Unrealized Losses | 458 |
Available-for-sale, Fair Value | 25,476 |
Common equity securities. |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost |  | 43
Available-for-sale, Gross Unrealized Gains |  | 3
Available-for-sale, Fair Value |  | 46
Equity investments carried at fair value | 189 |
State and Municipals, Taxable |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost |  | 14,559
Available-for-sale, Gross Unrealized Gains |  | 488
Available-for-sale, Fair Value |  | 15,047
Available-for-sale, Amortized Cost | 14,525 |
Available-for-sale, Gross Unrealized Gains | 383 |
Available-for-sale, Fair Value | 14,908 |
State and Municipals, Tax-exempt |  |
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost |  | 103,199
Available-for-sale, Gross Unrealized Gains |  | 1,136
Available-for-sale, Gross Unrealized Losses |  | 502
Available-for-sale, Fair Value |  | 103,833
Available-for-sale, Amortized Cost | 97,705 |
Available-for-sale, Gross Unrealized Gains | 864 |
Available-for-sale, Gross Unrealized Losses | 875 |
Available-for-sale, Fair Value | 97,694 |
Held-to-maturity, Amortized Cost | 6,858 | 6,859
Held-to-maturity, Gross Unrealized Gains | 24 | 152
Held-to-maturity, Gross Unrealized Losses | 57 | 13
Held-to-maturity, Fair value | $ 6,825 | $ 6,998

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt 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 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 investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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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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