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Commitments and Contingencies (Loan Contracts with Off-Balance Sheet Commitments) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016 | Apr. 01, 2017
Loan Contracts with Off-Balance Sheet Commitments |  |  |  |  |
Construction loan contract amount | $ 25,913,000 |  | $ 25,913,000 |  | $ 18,031,000
Cumulative advances | (10,349,000) |  | (10,349,000) |  | (6,957,000)
Remaining construction contingent commitment | 15,564,000 |  | 15,564,000 |  | $ 11,074,000
CountryPlace Commitment [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Recognized gain (loss) on the forward sales and whole loan commitments | (227,000) | $ 33,000 | (72,000) | $ (11,000) |
Gain (Loss) on Derivative Instruments, Net, Pretax | $ 10,000 | $ (18,000) | $ (15,000) | $ 10,000 |

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Amount before allowance of loans issued to build, improve or remodel a residential home. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)(2),(b)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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