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Loans Receivable and Allowance for Loan and Lease Losses Nonaccrual Loans (Details) - Nonperforming - USD ($) $ in Thousands | Sep. 30, 2018 | Mar. 31, 2018
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | $ 9,345 | $ 6,662
One-to-four family |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 4,709 | 4,561
Multifamily |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 2,328 | 964
Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 489 | 502
Business |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | $ 1,819 | $ 635

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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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