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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 | Sep. 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 |  | $ 280,425
Available-for-sale, Gross Unrealized Gains |  | 733
Available-for-sale, Gross Unrealized Losses |  | 6,364
Available-for-sale, Fair Value | 272,502 | 274,794
Held-to-maturity, Amortized Cost | 9,274 | 8,551
Held-to-maturity, Gross Unrealized Gains | 290 | 74
Held-to-maturity, Gross Unrealized Losses | 17 | 190
Held-to-maturity, Fair value | 9,547 | 8,435
Equity investments carried at fair value | 46 | 291
Net unrealized gains recognized in AOCI | 3 |
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 |  | 13,719
Available-for-sale, Gross Unrealized Losses |  | 134
Available-for-sale, Fair Value |  | 13,585
Held-to-maturity, Amortized Cost | 54 | 45
Held-to-maturity, Fair value | 54 | 45
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 |  | 35,284
Available-for-sale, Gross Unrealized Gains |  | 1
Available-for-sale, Gross Unrealized Losses |  | 811
Available-for-sale, Fair Value |  | 34,474
Held-to-maturity, Amortized Cost | 2,361 | 1,650
Held-to-maturity, Gross Unrealized Gains | 138 | 72
Held-to-maturity, Gross Unrealized Losses | 4 | 5
Held-to-maturity, Fair value | 2,495 | 1,717
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 |  | 6,281
Available-for-sale, Gross Unrealized Losses |  | 330
Available-for-sale, Fair Value |  | 5,951
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 |  | 95,089
Available-for-sale, Gross Unrealized Losses |  | 3,317
Available-for-sale, Fair Value |  | 91,772
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 |  | 25,941
Available-for-sale, Gross Unrealized Losses |  | 711
Available-for-sale, Fair Value |  | 25,230
Common equity securities. |  |
Schedule of Trading Securities and Other Trading Assets |  |
Equity investments carried at fair value | 46 | 291
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 |  | 13,576
Available-for-sale, Gross Unrealized Gains |  | 237
Available-for-sale, Fair Value |  | 13,813
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 |  | 90,535
Available-for-sale, Gross Unrealized Gains |  | 495
Available-for-sale, Gross Unrealized Losses |  | 1,061
Available-for-sale, Fair Value |  | 89,969
Held-to-maturity, Amortized Cost | 6,859 | 6,856
Held-to-maturity, Gross Unrealized Gains | 152 | 2
Held-to-maturity, Gross Unrealized Losses | 13 | 185
Held-to-maturity, Fair value | $ 6,998 | $ 6,673

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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