Commercial Loans Receivables and Allowance for Loan Loss (Commercial Loans Receivables by Class and Credit Quality Indicator) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Apr. 01, 2017
Direct Commercial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable, Gross	$ 16,368	$ 24,959
Direct Commercial Loans [Member] | Performing Financing Receivable [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable, Gross	16,368	24,886
Direct Commercial Loans [Member] | Watch List [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable, Gross	0	0
Direct Commercial Loans [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable, Gross	0	73
Participation commercial loans receivables [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable, Gross	275	1,084
Participation commercial loans receivables [Member] | Performing Financing Receivable [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable, Gross	275	1,084
Participation commercial loans receivables [Member] | Watch List [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable, Gross	0	0
Participation commercial loans receivables [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable, Gross	$ 0	$ 0