Equity Incentive Plan - Summary of Restricted Share Awards (Details) - Restricted Stock - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary of company's restricted share awards
Number of Shares, Nonvested at beginning of the period (in shares)	8,334	57,514	110,825
Number of Shares, Granted (in shares)	0	5,000	5,000
Number of Shares, Vested (in shares)	(3,333)	(30,084)	(32,441)
Number of shares forfeited (in shares)	0	(24,096)	(25,870)
Number of Shares, Nonvested at end of the period (in shares)	5,001	8,334	57,514
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)	$ 18.52	$ 23.78	$ 22.05
Weighted - Average Grant Date Fair Value, Granted (in dollars per share)	0	17.40	20.20
Weighted - Average Grant Date Fair Value, Vested (in dollars per share)	18.80	26.24	25.77
Weighted - Average Grant Date Fair Value, Forfeited (in dollars per share)	0	21.21	13.17
Weighted - Average Grant Date Fair Value, Nonvested at end of the period (in dollars per share)	$ 18.33	$ 18.52	$ 23.78