Equity Plan - Restricted Stock Activity (Details) - Restricted stock	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Number of Shares
Nonvested shares at the beginning of the period (in shares) | shares	199,503
Granted (in shares) | shares	82,770
Vested (in shares) | shares	(82,454)
Forfeited or expired (in shares) | shares	(18,634)
Nonvested shares at the end of the period (in shares) | shares	181,185
Weighted Average Grant Date Fair Value
Nonvested shares at the beginning of the period (in dollars per share) | $ / shares	$ 9.74
Granted (in dollars per share) | $ / shares	14.36
Vested (in dollars per share) | $ / shares	9.69
Forfeited or expired (in dollars per share) | $ / shares	11.87
Nonvested shares at the end of the period (in dollars per share) | $ / shares	$ 11.66