Qualified Affordable Housing Project Investments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) project	Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Original Investment Value	$ 16,181	$ 10,000
Current Recorded Investment	11,582	7,000
Unfunded Liability Obligation	1,300	749
Tax Credits and Tax Deductions	2,514	961
Amortization of Investments	1,599	1,324
Net Income Tax Benefit	$ (2,135)	(1,233)
Number of projects | project	3
Period of tax credits	10 years
WNC Institutional Tax Credit Fund X, CA Series 11 L.P.
Schedule of Equity Method Investments [Line Items]
Original Investment Value	$ 5,000	5,000
Current Recorded Investment	2,750	3,250
Unfunded Liability Obligation	85	223
Tax Credits and Tax Deductions	455	488
Amortization of Investments	500	542
Net Income Tax Benefit	(663)	(596)
WNC Institutional Tax Credit Fund X, CA Series 12, L.P.
Schedule of Equity Method Investments [Line Items]
Original Investment Value	5,000	5,000
Current Recorded Investment	3,250	3,750
Unfunded Liability Obligation	288	526
Tax Credits and Tax Deductions	482	473
Amortization of Investments	500	782
Net Income Tax Benefit	(690)	$ (637)
Sycamore Court
Schedule of Equity Method Investments [Line Items]
Original Investment Value	6,181
Current Recorded Investment	5,582
Unfunded Liability Obligation	927
Tax Credits and Tax Deductions	1,577
Amortization of Investments	599
Net Income Tax Benefit	$ (782)