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Securities Held-to-Maturity (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) item	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Held-to-Maturity
Carrying Value	$ 50,520		$ 50,520		$ 27,837
Held-to-Maturity | B Piece bonds
Held-to-Maturity
Weighted average variable interest rate (as a percent)	3.63%		3.63%
Estimated weighted average maturity period			5 years 8 months 12 days
Weighted average effective interest rate (as a percent)	11.32%		11.32%		12.97%
Face Value			$ 70,518		$ 40,566
Carrying Value	$ 50,520		50,520		27,837
Unrealized Gain	1,792		1,792		602
Estimated Fair Value	52,312		52,312		$ 28,439
Impairment charges			0
Interest income	600	$ 500	1,700	$ 900
Held-to-maturity securities, estimated fiscal year
Within one year	10,700		10,700
After one year through five years	30,600		30,600
After five years through ten years	20,000		20,000
After ten years	$ 9,200		9,200
Held-to-Maturity | Two B Piece bonds
Held-to-Maturity
Initial face value of bonds purchased			31,200
Discounted value of bonds purchased			$ 21,600
Number of B Piece bonds | item			2
Held-to-Maturity | Five B Piece bonds
Held-to-Maturity
Discounted value of bonds purchased			$ 48,800
B Piece retained percentage			49.00%
Number of B Piece bonds | item			5
Remaining of B Piece bond sold to the third party at par	51.00%		51.00%

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