Stock-Based Compensation - Summary of Status of Non-Vested Restricted Shares (Details) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Number of restricted stock, Unvested Beginning of period	45,397	23,329
Number of restricted stock, Granted		35,989
Number of restricted stock, Forfeited	(1,667)	(2,480)
Number of restricted stock, Vested	(11,024)	(11,441)
Number of restricted stock, Unvested End of period	32,706	45,397
Weighted Average Grant Date Fair Value, Unvested Beginning of period	$ 34.12	$ 39.69
Weighted Average Grant Date Fair Value, Granted		31.36
Weighted Average Grant Date Fair Value, Forfeited	$ 32.20	40.54
Weighted Average Grant Date Fair Value, Vested	34.04	35.38
Weighted Average Grant Date Fair Value, Unvested End of period	$ 34.25	$ 34.12