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Goodwill and other intangible assets - Components of other intangible assets subject to amortization (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets
Gross Amount	$ 74,356	$ 72,627
Finite Lived Intangible Assets Accumulated Amortization	56,641	51,958
Finite-Lived Intangible Assets, Net	17,715	20,669
Core deposits
Finite-Lived Intangible Assets
Core deposits - Gross	37,224	37,224
Finite Lived Intangible Assets Accumulated Amortization	27,931	26,070
Finite-Lived Intangible Assets, Net	9,293	11,154
Other customer relationship
Finite-Lived Intangible Assets
Customer relationships - Gross	36,644	34,915
Finite Lived Intangible Assets Accumulated Amortization	28,621	25,847
Finite-Lived Intangible Assets, Net	8,023	9,068
Trademarks
Finite-Lived Intangible Assets
Gross Amount	488	488
Finite Lived Intangible Assets Accumulated Amortization	89	41
Finite-Lived Intangible Assets, Net	$ 399	$ 447

X

- Definition

Bank deposits belonging to an acquired bank that can be counted on as a stable source of lending funds. These deposits have the following attributes: predictable costs and low sensitivity to interest rates. This intangible asset is usually amortized over its estimated useful life.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
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- Definition

Gross carrying amount before accumulated amortization as of the balance sheet date to an asset acquired in a business combination representing a favorable existing relationship with customers having a finite beneficial life.

+ References

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 340
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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