Interest Income on Loans and Financing Leases (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest and Other Income [Line Items]
Interest on loans and financing lease	$ 1,101	$ 1,131	$ 3,263	$ 3,272
Mortgage loans
Interest and Other Income [Line Items]
Interest on loans and financing lease	456	472	1,364	1,208
Capital Improvement Loans
Interest and Other Income [Line Items]
Interest on loans and financing lease	66	117	267	417
Working Capital Loans
Interest and Other Income [Line Items]
Interest on loans and financing lease	211	177	529	556
Direct Financing Leases
Interest and Other Income [Line Items]
Interest on loans and financing lease	$ 368	$ 365	$ 1,103	$ 1,091