Employee Benefits and Stock Compensation - Summary of Status of Restricted Stock and Restricted Stock Units (Details)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Restricted Stock
Restricted Award Shares
Non-vested beginning balance (in shares) | shares	187,511
Granted (in shares) | shares	242,613
Forfeited/Cancelled (in shares) | shares	(15,514)
Vested (in shares) | shares	(119,480)
Non-vested ending balance (in shares) | shares	295,130
Weighted-Average Grant-Date Fair Value
Non-vested at beginning of period (in dollars per share) | $ / shares	$ 19.18
Granted (in dollars per share) | $ / shares	26.48
Forfeited/Cancelled (in dollars per share) | $ / shares	25.47
Vested (in dollars per share) | $ / shares	21.05
Non-vested at ending of period (in dollars per share) | $ / shares	$ 24.09
Restricted Stock Units
Restricted Award Shares
Non-vested beginning balance (in shares) | shares	375,967
Granted (in shares) | shares	173,193
Forfeited/Cancelled (in shares) | shares	(247)
Vested (in shares) | shares	(82,077)
Non-vested ending balance (in shares) | shares	466,836
Weighted-Average Grant-Date Fair Value
Non-vested at beginning of period (in dollars per share) | $ / shares	$ 16.96
Granted (in dollars per share) | $ / shares	24.02
Forfeited/Cancelled (in dollars per share) | $ / shares	10.50
Vested (in dollars per share) | $ / shares	13.34
Non-vested at ending of period (in dollars per share) | $ / shares	$ 20.22