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Goodwill and Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill And Intangible Assets [Line Items]
Goodwill and intangible assets, net	$ 199,417,000	$ 63,778,000	$ 46,531,000	$ 27,854,000
Goodwill impairment	0	0
Intangibles, impairment charge	$ 0		0
Minimum
Goodwill And Intangible Assets [Line Items]
Finite lived intangible assets, Amortization period	8 years
Maximum
Goodwill And Intangible Assets [Line Items]
Finite lived intangible assets, Amortization period	10 years
Core Deposit Intangibles
Goodwill And Intangible Assets [Line Items]
Intangibles, impairment charge		$ 1,276,000,000
Corporate | Operating Segment
Goodwill And Intangible Assets [Line Items]
Goodwill and intangible assets, net	$ 0		$ 1,521,000	$ 1,497,000

X

- Definition

Goodwill and intangible assets.

+ References

No definition available.

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount of loss from the write-down of an asset representing the 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 50
-Paragraph 2
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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
-Paragraph 3
-Subparagraph (b)
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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.

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