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Note Goodwill and other intangible assets (Components of other intangible assets subject to amortization) (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ 73,344 | $ 72,907
Finite Lived Intangible Assets Accumulated Amortization | 50,338 | 43,398
Finite-Lived Intangible Assets, Net | 23,006 | 29,509
Core deposits |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Core Deposits, Gross | 37,224 | 37,224
Finite Lived Intangible Assets Accumulated Amortization | 25,139 | 22,347
Finite-Lived Intangible Assets, Net | 12,085 | 14,877
Other customer relationship |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Customer Relationships, Gross | 35,632 | 35,683
Finite Lived Intangible Assets Accumulated Amortization | 25,182 | 21,051
Finite-Lived Intangible Assets, Net | 10,450 | $ 14,632
Trademarks |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 488 |
Finite Lived Intangible Assets Accumulated Amortization | 17 |
Finite-Lived Intangible Assets, Net | $ 471 |

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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