Shareholders' Equity - Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs)	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Restricted Stock Units
Unvested at the beginning of the period (in shares) | shares	19,827
Shares granted during the period (in shares) | shares	7,055
Shares vested during the period (in shares) | shares	(7,697)
Unvested at the end of the period (in shares) | shares	19,185
Weighted Average Grant Date Fair Value
Weighted Average Grant Date Fair Value, at the beginning of the period (usd per share) | $ / shares	$ 14.35
Granted, Weighted Average Grant Date Fair Value (usd per share) | $ / shares	15.37
Vested, Weighted Average Grant Date Fair Value (usd per share) | $ / shares	14.75
Weighted Average Grant Date Fair Value, at the end of the period (usd per share) | $ / shares	$ 14.56