Basis of Presentation - Additional Information (Details) $ / shares in Units, $ in Thousands				3 Months Ended		9 Months Ended
	Sep. 15, 2016 USD ($) $ / shares shares	Aug. 15, 2016 USD ($)	Jun. 28, 2016 shares	Sep. 30, 2016 USD ($) shares	Sep. 30, 2015	Sep. 30, 2016 USD ($) shares	Sep. 30, 2015	Jul. 31, 2016 shares	Dec. 31, 2015 shares
Class Of Stock [Line Items]
Description of stock split						the Company declared a 100-for-1 stock split, increasing the number of issued and authorized shares from 171,800 to 17,180,000 and 250,000 to 25,000,000, respectively.
Stock split ratio			100
Common stock, shares issued				23,975,122		23,975,122			17,180,000
Common stock, shares authorized				75,000,000		75,000,000			25,000,000
Proceeds from issuance of common stock, net of offering costs | $						$ 115,525
Deferred tax liability | $				$ 13,181		$ 13,181
Statutory federal income tax rate				35.00%	35.00%	35.00%	35.00%
State income tax rate				6.50%	6.50%	6.50%	6.50%
Pro forma
Class Of Stock [Line Items]
Effective tax rate				37.22%	30.90%	37.33%	34.35%
Initial Public Offering
Class Of Stock [Line Items]
Common stock sold and issued, shares	6,764,704
Common stock sold and issued, price per share | $ / shares	$ 19
Proceeds from issuance of common stock, net of offering costs | $	$ 115,525
Distribution to majority shareholder from net proceeds | $	55,000
Repayments of aggregate principal amount of subordinated notes from net proceeds | $	$ 10,075	$ 10,075
Minimum
Class Of Stock [Line Items]
Common stock, shares issued			171,800
Common stock, shares authorized			250,000					25,000,000
Maximum
Class Of Stock [Line Items]
Common stock, shares issued			17,180,000
Common stock, shares authorized			25,000,000					75,000,000