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Loan Receivable and Allowance for Loan and Lease Losses Impaired loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Mar. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Related Allowance | $ 197 |  | $ 197 |  | $ 556
Impaired Financing Receivable, Recorded Investment | 15,699 |  | 15,699 |  | 16,512
Impaired Financing Receivable, Unpaid Principal Balance | 16,835 |  | 16,835 |  | 17,195
Impaired Financing Receivable, Average Recorded Investment | 15,107 | $ 17,053 | 15,910 | $ 17,216 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 31 | 173 | 44 | 420 |
One- to four family loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 5,273 |  | 5,273 |  | 2,752
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 6,535 |  | 6,535 |  | 3,007
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,657 |  | 1,657 |  | 4,295
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,657 |  | 1,657 |  | 4,541
Impaired Financing Receivable, Related Allowance | 97 |  | 97 |  | 286
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 5,281 | 728 | 5,306 | 797 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 2 | 2 | 5 | 9 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 1,660 | 6,068 | 1,663 | 6,010 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 2 | 56 | 4 | 87 |
Multifamily Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,241 |  | 1,241 |  | 237
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 1,580 |  | 1,580 |  | 237
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 1,251
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 1,349
Impaired Financing Receivable, Related Allowance | 0 |  | 0 |  | 181
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 609 | 157 | 1,325 | 128 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 6 | 0 | 6 | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 1,339 | 0 | 1,338 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 6 | 0 | 15 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,862 |  | 1,862 |  | 1,880
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,030 |  | 2,030 |  | 1,880
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 741
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 741
Impaired Financing Receivable, Related Allowance | 0 |  | 0 |  | 76
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,866 | 3,311 | 1,867 | 3,776 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 53 | 0 | 114 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 948 | 0 | 523 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 19 | 0 | 39 |
Construction Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Business [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2,585 |  | 2,585 |  | 4,568
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 1,869 |  | 1,869 |  | 4,652
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 3,081 |  | 3,081 |  | 788
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 3,164 |  | 3,164 |  | 788
Impaired Financing Receivable, Related Allowance | 100 |  | 100 |  | $ 13
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,593 | 954 | 2,608 | 1,198 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 21 | 14 | 29 | 78 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 3,098 | 3,537 | 3,141 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 23 | 0 | 78 |
Consumer Loan [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 0 | 0 | 0 | $ 0 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 |  |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 11 | 0 | $ 3,446 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | $ 0 | $ 0 | $ 0 | $ 0 |

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