Description of Company and Basis of Presentation (Details) $ / shares in Units, $ in Thousands					12 Months Ended
	Oct. 11, 2019 shares	Sep. 24, 2019 $ / shares shares	Feb. 24, 2017 shares	Feb. 15, 2017 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) employee branch	Dec. 31, 2018 USD ($)
Class of Stock [Line Items]
Number of employees (more than) | employee					3,500
Number of branch locations (more than ) | branch					175
Proceeds from issuance of IPO | $				$ 164,000
Repayments of borrowings outstanding | $				$ 164,000	$ 0	$ 23,872
Option period					30
Percentage of ownership before transaction	65.30%
Percentage of ownership after transaction	52.50%
IPO
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)				12,800,000
Offering price (in dollars per share) | $ / shares				$ 14.00
Over-Allotment Option
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)	712,500	712,500
Subsidiaries
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)		4,750,000
Offering price (in dollars per share) | $ / shares		$ 17.00
Subsidiaries | Over-Allotment Option
Class of Stock [Line Items]
Number of shares issued in transaction (in shares)			1,920,000