Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Apr. 01, 2017
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Servicing Asset at Fair Value, Amount		$ 1,310	$ 1,110
Recurring [Member] | US Treasury and Government [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	(648)
Recurring [Member] | Mortgage-backed securities [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	(6,456)
Recurring [Member] | Securities issued by states and political subdivisions [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	(6,301)
Recurring [Member] | Corporate debt securities [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	(1,681)
Recurring [Member] | Marketable equity securities [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	(9,865)
Recurring [Member] | Interest rate lock commitments [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[2]	(21)
Recurring [Member] | Forward loan sale commitments [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[2]	(159)
Recurring [Member] | Mortgage servicing rights [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[3]	(1,310)
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Construction Loan		10,350
Inventory Finance Receivable		31,249
Loans Held for Investment Fair Value Disclosure		95,136
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Construction Loan		0
Inventory Finance Receivable		0
Loans Held for Investment Fair Value Disclosure		0
Fair Value, Inputs, Level 1 [Member] | Recurring [Member] | US Treasury and Government [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	0
Fair Value, Inputs, Level 1 [Member] | Recurring [Member] | Mortgage-backed securities [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	0
Fair Value, Inputs, Level 1 [Member] | Recurring [Member] | Securities issued by states and political subdivisions [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	0
Fair Value, Inputs, Level 1 [Member] | Recurring [Member] | Corporate debt securities [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	0
Fair Value, Inputs, Level 1 [Member] | Recurring [Member] | Marketable equity securities [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	(9,865)
Fair Value, Inputs, Level 1 [Member] | Recurring [Member] | Interest rate lock commitments [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[2]	0
Fair Value, Inputs, Level 1 [Member] | Recurring [Member] | Forward loan sale commitments [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[2]	0
Fair Value, Inputs, Level 1 [Member] | Recurring [Member] | Mortgage servicing rights [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[3]	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Construction Loan		0
Inventory Finance Receivable		0
Loans Held for Investment Fair Value Disclosure		0
Fair Value, Inputs, Level 2 [Member] | Recurring [Member] | US Treasury and Government [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	(648)
Fair Value, Inputs, Level 2 [Member] | Recurring [Member] | Mortgage-backed securities [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	(6,456)
Fair Value, Inputs, Level 2 [Member] | Recurring [Member] | Securities issued by states and political subdivisions [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	(6,301)
Fair Value, Inputs, Level 2 [Member] | Recurring [Member] | Corporate debt securities [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	(1,681)
Fair Value, Inputs, Level 2 [Member] | Recurring [Member] | Marketable equity securities [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	0
Fair Value, Inputs, Level 2 [Member] | Recurring [Member] | Interest rate lock commitments [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[2]	0
Fair Value, Inputs, Level 2 [Member] | Recurring [Member] | Forward loan sale commitments [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[2]	0
Fair Value, Inputs, Level 2 [Member] | Recurring [Member] | Mortgage servicing rights [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[3]	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Construction Loan		10,350
Inventory Finance Receivable		31,249
Loans Held for Investment Fair Value Disclosure		95,136
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | US Treasury and Government [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	0
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Mortgage-backed securities [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	0
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Securities issued by states and political subdivisions [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	0
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Corporate debt securities [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	0
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Marketable equity securities [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[1]	0
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Interest rate lock commitments [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[2]	(21)
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Forward loan sale commitments [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[2]	(159)
Fair Value, Inputs, Level 3 [Member] | Recurring [Member] | Mortgage servicing rights [Member]
Summary of Assets Measured at Fair Value on a Recurring Basis
Assets fair value	[3]	$ (1,310)

[1] Unrealized gains or losses on investments are recorded in accumulated other comprehensive income (loss) at each measurement date

[2] Gains or losses on derivatives are recognized in current period earnings through cost of sales.

[3] Changes in the fair value of mortgage servicing rights are recognized in the current period earnings through net revenue.