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Stock-Based Compensation - Restricted Stock Award Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock Awards
Shares
Nonvested at beginning of period (in shares)	20,707	66,033	137,399
Vested (in shares)	(20,707)	(43,148)	(67,877)
Forfeited (in shares)		(2,178)	(3,489)
Nonvested at end of period (in shares)	0	20,707	66,033
Weighted-Average Grant Date Fair Value
Nonvested at beginning of period (in usd per share)	$ 17.59	$ 17.28	$ 17.00
Vested (in usd per share)	17.59	17.07	16.74
Forfeited (in usd per share)		18.32	16.92
Nonvested at end of period (in usd per share)	$ 0	$ 17.59	$ 17.28
RSU
Shares
Nonvested at beginning of period (in shares)	233,540	179,185	90,544
Vested (in shares)	(109,853)	(64,173)	(32,375)
Forfeited (in shares)	(8,543)	(8,070)	(4,617)
Nonvested at end of period (in shares)	316,116	233,540	179,185
Weighted-Average Grant Date Fair Value
Nonvested at beginning of period (in usd per share)	$ 30.41	$ 28.94	$ 25.31
Vested (in usd per share)	29.21	29.25	25.44
Forfeited (in usd per share)	28.07	30.25	27.82
Nonvested at end of period (in usd per share)	$ 26.57	$ 30.41	$ 28.94

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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- Definition

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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- Definition

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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- Definition

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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-Publisher FASB
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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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