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Commercial Loans Receivables and Allowance for Loan Loss (Concentrations of Commercial Loans Receivables) (Details) | Dec. 29, 2018 | Mar. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial Loans Receivable Principal Balance Concentration | 16.70% | 37.40%
ARIZONA |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial Loans Receivables Geographic Concentration Percentage | 14.20% | 16.70%
CALIFORNIA |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial Loans Receivables Geographic Concentration Percentage | 13.30% | 14.40%
TEXAS |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial Loans Receivables Geographic Concentration Percentage | 13.10% | 9.00%
OREGON |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial Loans Receivables Geographic Concentration Percentage | 11.00% | 14.70%

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