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Stock-Based Compensation Plans - Summary of Nonvested RSAs (Details) - Restricted Share Awards (RSAs)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Number of Shares
Nonvested, beginning balance (in shares) | shares	213,337
Vested (in shares) | shares	(106,610)
Forfeited (in shares) | shares	(10,934)
Nonvested, ending balance (in shares) | shares	95,793
Weighted Average Grant Date Fair Value
Nonvested, beginning balance (in dollars per share) | $ / shares	$ 20.21
Vested (in dollars per share) | $ / shares	20.17
Forfeited (in dollars per share) | $ / shares	20.12
Nonvested, ending balance (in dollars per share) | $ / shares	$ 20.21

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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