Commercial Loans Receivables and Allowance for Loan Loss (Concentrations of Inventory Finance Receivables) (Details)	Sep. 30, 2017	Apr. 01, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans Receivable Principal Balance Concentration	23.10%	23.00%
INDIANA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Inventory Finance Receivables Geographic Concentration Percentage	11.20%	10.70%
ARIZONA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Inventory Finance Receivables Geographic Concentration Percentage	16.10%	21.30%
CALIFORNIA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Inventory Finance Receivables Geographic Concentration Percentage	11.30%	11.00%
Texas [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Inventory Finance Receivables Geographic Concentration Percentage	11.00%	11.00%
OREGON
Accounts, Notes, Loans and Financing Receivable [Line Items]
Inventory Finance Receivables Geographic Concentration Percentage	18.70%	15.70%