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Commercial Loans Receivables and Allowance for Loan Loss (Concentrations of Inventory Finance Receivables) (Details) | Sep. 30, 2017 | Apr. 01, 2017
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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%

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