Equity Incentive Plan - Summary of Restricted Share Awards (Details) - Restricted Stock - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary of company's restricted share awards
Number of Shares, Nonvested at beginning of the period (in shares)	179,641	158,035	140,077
Number of Shares, Granted (in shares)	85,254	87,018	81,658
Number of Shares, Vested (in shares)	(94,415)	(65,412)	(63,700)
Number of Shares, Nonvested at end of the period (in shares)	170,480	179,641	158,035
Summary of company's restricted share awards, weighted average grant date fair value
Weighted - Average Grant Date Fair Value, Nonvested at beginning of the period (in dollars per share)	$ 14.92	$ 12.39	$ 12.70
Weighted - Average Grant Date Fair Value, Granted (in dollars per share)	26.59	17.46	13.43
Weighted - Average Grant Date Fair Value, Vested (in dollars per share)	13.80	12.17	14.39
Weighted - Average Grant Date Fair Value, Nonvested at end of the period (in dollars per share)	$ 21.38	$ 14.92	$ 12.39