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Goodwill and other intangible assets - Components of other intangible assets subject to amortization (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets |  |  |
Core deposits - Gross |  | $ 24,400 |
Customer relationships - Gross |  | $ 16,300 |
Gross Amount | $ 39,954 |  | $ 80,621
Finite Lived Intangible Assets Accumulated Amortization | 22,600 |  | 58,005
Finite-Lived Intangible Assets, Net | 17,354 |  | 22,616
Core deposits |  |  |
Finite-Lived Intangible Assets |  |  |
Core deposits - Gross | 12,810 |  | 37,224
Finite Lived Intangible Assets Accumulated Amortization | 7,152 |  | 29,792
Finite-Lived Intangible Assets, Net | 5,658 |  | 7,432
Other customer relationship |  |  |
Finite-Lived Intangible Assets |  |  |
Customer relationships - Gross | 26,656 |  | 42,909
Finite Lived Intangible Assets Accumulated Amortization | 15,236 |  | 28,075
Finite-Lived Intangible Assets, Net | 11,420 |  | 14,834
Trademarks |  |  |
Finite-Lived Intangible Assets |  |  |
Gross Amount | 488 |  | 488
Finite Lived Intangible Assets Accumulated Amortization | 212 |  | 138
Finite-Lived Intangible Assets, Net | $ 276 |  | $ 350

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- 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 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) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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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 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 Accumulated amount of 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 -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 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 -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 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)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after 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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