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Goodwill and Other Intangible Assets - Textual (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Apr. 12, 2019 | Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |
Goodwill | $ 926,648 |  |  | $ 845,687
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Core deposit premiums | $ 101,149 |  |  | 91,334
Minimum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life | 10 years |  |  |
Maximum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life | 15 years |  |  |
Core Deposit Premium |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Core deposit premiums | $ 90,416 |  |  | $ 79,807
Core Deposit Premium | Minimum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life | 10 years |  |  |
Core Deposit Premium | Maximum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life | 15 years |  |  |
Reliance Bancshares, Inc. |  |  |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |
Goodwill |  | $ 81,000 | $ 80,961 |
Reliance Bancshares, Inc. | Core Deposit Premium |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Core deposit premiums | $ 18,400 |  |  |

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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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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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