Stock-Based Compensation - Summary of Restricted Stock (Details) - Restricted Stock	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Shares
Nonvested at beginning of period (in shares) | shares	50,822
Granted (in shares) | shares	14,453
Vested (in shares) | shares	(18,774)
Forfeited (in shares) | shares	0
Nonvested at end of period (in shares) | shares	46,501
Weighted Average Grant Date Value
Nonvested at beginning of period (in dollars per share) | $ / shares	$ 23.21
Granted (in dollars per share) | $ / shares	34.74
Vested (in dollars per share) | $ / shares	24.49
Forfeited (in dollars per share) | $ / shares	0.00
Nonvested at end of period (in dollars per share) | $ / shares	$ 26.28