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Goodwill and Other Intangible Assets - Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Goodwill and Intangible Assets Disclosure [Abstract] |  |
Goodwill | $ 926,648 | $ 845,687
Finite-Lived Intangible Assets [Line Items] |  |
Other intangible assets, net | 101,149 | 91,334
Total goodwill and other intangible assets | 1,027,797 | 937,021
Core Deposit Premium |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 124,334 | 105,984
Accumulated amortization | (33,918) | (26,177)
Other intangible assets, net | 90,416 | 79,807
Books of Business Intangible |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 15,234 | 15,234
Accumulated amortization | (4,501) | (3,707)
Other intangible assets, net | $ 10,733 | $ 11,527

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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 Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance. + References No definition available. + Details
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