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Goodwill and other intangibles Goodwill and other intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | $ 112,739 |  | $ 112,739 |  | $ 72,334
Other Intangible Assets, Net | 7,260 |  | 7,260 |  | 0
Goodwill, Acquired During Period |  |  | 40,405 |  |
Indefinite-lived Intangible Assets Acquired |  |  | 7,549 |  |
Acquired goodwill and intangibles |  |  | 47,954 |  |
Amortization of Intangible Assets | 289 | $ 0 | 289 | $ 0 |
Finite-lived Intangible Assets Acquired | 6,249 |  | 6,249 |  |
Indefinite-lived Intangible Assets Acquired | 1,300 |  | 1,300 |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 289 |  | 289 |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 289 |  | 289 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 1,234 |  | 1,234 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 1,149 |  | 1,149 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 869 |  | 869 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 629 |  | 629 |  |
Intangible Assets, Gross (Excluding Goodwill) | 7,549 |  | 7,549 |  |
Intangible Assets, Net (Including Goodwill) | 119,999 |  | 119,999 |  | 72,334
Core Deposits [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 289 |  | 289 |  | $ 0
Trade Names [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | $ 0 |  | $ 0 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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