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Stock-Based Compensation - Summary of stock option activity (Details) - Stock Options [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Options
Outstanding, beginning of period (in shares)	76,764	165,920	245,717
Exercised (in shares)	(14,743)	(88,053)	(79,797)
Expired (in shares)	(2,435)	(1,103)
Outstanding, end of period (in shares)	59,586	76,764	165,920
Weighted-Average Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 22.33	$ 21.92	$ 19.82
Exercised (in dollars per share)	23.16	21.54	15.43
Expired (in dollars per share)	19.86	21.16
Outstanding, end of period (in dollars per share)	$ 22.26	$ 22.33	$ 21.92
Term and Intrinsic Value
Outstanding Weighted Average Remaining Contractual Term	2 years 2 months 12 days	2 years 10 months 24 days	4 years 2 months 12 days
Outstanding, Aggregate Intrinsic Value	$ 352	$ 446	$ 2,292

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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