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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Jun. 30, 2018
Schedule of Trading Securities and Other Trading Assets |  |
Available-for-sale, Amortized Cost | $ 273,742 |
Available-for-sale, Gross Unrealized Gains | 1,666 |
Available-for-sale, Gross Unrealized Losses | 2,906 |
Available-for-sale, Fair Value | 272,502 |
Available-for-sale, Amortized Cost |  | $ 279,502
Available-for-sale, Gross Unrealized Gains |  | 1,039
Available-for-sale, Gross Unrealized Losses |  | 5,491
Available-for-sale, Fair Value | 272,502 | 275,050
Held-to-maturity, Amortized Cost | 9,274 | 8,780
Held-to-maturity, Gross Unrealized Gains | 290 | 91
Held-to-maturity, Gross Unrealized Losses | 17 | 113
Held-to-maturity, Fair value | 9,547 | 8,758
Equity investments carried at fair value | 46 | 278
Net unrealized gains recognized in AOCI | 2 |
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 |  | 15,809
Available-for-sale, Gross Unrealized Losses |  | 109
Available-for-sale, Fair Value |  | 15,700
Held-to-maturity, Amortized Cost | 54 | 48
Held-to-maturity, Gross Unrealized Gains |  | 1
Held-to-maturity, Fair value | 54 | 49
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 |  | 27,461
Available-for-sale, Gross Unrealized Gains |  | 1
Available-for-sale, Gross Unrealized Losses |  | 523
Available-for-sale, Fair Value |  | 26,939
Held-to-maturity, Amortized Cost | 2,361 | 1,875
Held-to-maturity, Gross Unrealized Gains | 138 | 84
Held-to-maturity, Gross Unrealized Losses | 4 | 4
Held-to-maturity, Fair value | 2,495 | 1,955
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 |  | 6,292
Available-for-sale, Gross Unrealized Losses |  | 319
Available-for-sale, Fair Value |  | 5,973
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 |  | 95,179
Available-for-sale, Gross Unrealized Losses |  | 3,131
Available-for-sale, Fair Value |  | 92,048
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 |  | 25,934
Available-for-sale, Gross Unrealized Losses |  | 587
Available-for-sale, Fair Value |  | 25,347
Common equity securities. |  |
Schedule of Trading Securities and Other Trading Assets |  |
Equity investments carried at fair value | 46 | 278
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 |  | 13,607
Available-for-sale, Gross Unrealized Gains |  | 302
Available-for-sale, Fair Value |  | 13,909
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 |  | 95,220
Available-for-sale, Gross Unrealized Gains |  | 736
Available-for-sale, Gross Unrealized Losses |  | 822
Available-for-sale, Fair Value |  | 95,134
Held-to-maturity, Amortized Cost | 6,859 | 6,857
Held-to-maturity, Gross Unrealized Gains | 152 | 6
Held-to-maturity, Gross Unrealized Losses | 13 | 109
Held-to-maturity, Fair value | $ 6,998 | $ 6,754

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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 This item represents the cost of debt 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: 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 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 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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