Variable Interest Entities - Letters of Credit (Details) - USD ($) $ in Thousands	Sep. 30, 2014	Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash collateral and other assets	$ 9,135	$ 10,292
Expected LOC losses	4,708	2,623
Accounts payable	1,026	1,010
Maximum exposure for LOC losses	29,502	33,380
Exposure secured by titles to customers' automobiles	$ 7,800	$ 9,900