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Fair Value Measurements (Assets Measured at Fair Value on a Recurring Basis) (Details) | 12 Months Ended
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Mar. 31, 2018 USD ($)
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Fair Value, Assets, Level 1, Level 2, or Level 3 Transfers, Amount | $ 0 |
Recurring [Member] | Securities issued by the U.S Treasury and Government [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | (293,000) | [1]
Recurring [Member] | Mortgage-backed securities [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | (7,499,000) | [1]
Recurring [Member] | Securities issued by states and political subdivisions [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | (6,337,000) | [1]
Recurring [Member] | Corporate Debt Securities [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | (2,052,000) | [1]
Recurring [Member] | Marketable equity securities [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | (8,695,000) | [1]
Level 1 [Member] |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity, Fair Value Disclosure | 0 |
Level 1 [Member] | Recurring [Member] | Securities issued by the U.S Treasury and Government [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | 0 | [1]
Level 1 [Member] | Recurring [Member] | Mortgage-backed securities [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | 0 | [1]
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 | 0 | [1]
Level 1 [Member] | Recurring [Member] | Corporate Debt Securities [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | 0 | [1]
Level 1 [Member] | Recurring [Member] | Marketable equity securities [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | (8,695,000) | [1]
Level 2 [Member] |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity, Fair Value Disclosure | 0 |
Level 2 [Member] | Recurring [Member] | Securities issued by the U.S Treasury and Government [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | (293,000) | [1]
Level 2 [Member] | Recurring [Member] | Mortgage-backed securities [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | (7,499,000) | [1]
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 | (6,337,000) | [1]
Level 2 [Member] | Recurring [Member] | Corporate Debt Securities [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | (2,052,000) | [1]
Level 2 [Member] | Recurring [Member] | Marketable equity securities [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | 0 | [1]
Level 3 [Member] |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity, Fair Value Disclosure | 18,853,000 |
Level 3 [Member] | Recurring [Member] | Securities issued by the U.S Treasury and Government [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | 0 | [1]
Level 3 [Member] | Recurring [Member] | Mortgage-backed securities [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | 0 | [1]
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 | 0 | [1]
Level 3 [Member] | Recurring [Member] | Corporate Debt Securities [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | 0 | [1]
Level 3 [Member] | Recurring [Member] | Marketable equity securities [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | 0 | [1]
Mortgage Servicing Rights [Member] | Recurring [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | (1,410,000) | [2]
Mortgage Servicing Rights [Member] | Level 1 [Member] | Recurring [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | 0 | [2]
Mortgage Servicing Rights [Member] | Level 2 [Member] | Recurring [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | 0 | [2]
Mortgage Servicing Rights [Member] | Level 3 [Member] | Recurring [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | (1,410,000) | [2]
Forward loan sale commitments [Member] | Recurring [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | (26,000) | [3]
Forward loan sale commitments [Member] | Level 1 [Member] | Recurring [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | 0 | [3]
Forward loan sale commitments [Member] | Level 2 [Member] | Recurring [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | 0 | [3]
Forward loan sale commitments [Member] | Level 3 [Member] | Recurring [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | (26,000) | [3]
Interest rate lock commitments [Member] | Recurring [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | (12,000) | [3]
Interest rate lock commitments [Member] | Level 1 [Member] | Recurring [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | 0 | [3]
Interest rate lock commitments [Member] | Level 2 [Member] | Recurring [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | 0 | [3]
Interest rate lock commitments [Member] | Level 3 [Member] | Recurring [Member] |  |
Summary of Assets Measured at Fair Value on a Recurring Basis |  |
Assets fair value | $ (12,000) | [3]
[1] | Unrealized gains or losses on investments are recorded in accumulated other comprehensive income (loss) at each measurement date.
[2] | Changes in the fair value of mortgage servicing rights are recognized in the current period earnings through net revenue.
[3] | Gains or losses on derivatives are recognized in current period earnings through cost of sales.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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