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Loan Receivable and Allowance for Loan and Lease Losses Impaired loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Related Allowance | $ 176 |  | $ 176 |  | $ 556
Impaired Financing Receivable, Recorded Investment | 16,719 |  | 16,719 |  | 16,512
Impaired Financing Receivable, Unpaid Principal Balance | 18,563 |  | 18,563 |  | 17,195
Impaired Financing Receivable, Average Recorded Investment | 16,798 | $ 17,341 | 14,507 | $ 16,159 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 101 | 64 | 212 | 484 |
One- to four family loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,046 |  | 3,046 |  | 2,752
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 4,172 |  | 4,172 |  | 3,007
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,650 |  | 1,650 |  | 4,295
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,650 |  | 1,650 |  | 4,541
Impaired Financing Receivable, Related Allowance | 97 |  | 97 |  | 286
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 3,062 | 736 | 2,863 | 731 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 9 | 2 | 14 | 11 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 1,652 | 6,299 | 1,660 | 6,106 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 19 | 14 | 23 | 101 |
Multifamily Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,229 |  | 1,229 |  | 237
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 1,578 |  | 1,578 |  | 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 | 1,236 | 157 | 1,296 | 137 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 6 | 0 | 13 | 0 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 1,334 | 0 | 1,336 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 2 | 0 | 17 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,859 |  | 1,859 |  | 1,880
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,028 |  | 2,028 |  | 1,880
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 3,427 |  | 3,427 |  | 741
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 3,427 |  | 3,427 |  | 741
Impaired Financing Receivable, Related Allowance | 12 |  | 12 |  | 76
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,860 | 2,945 | 1,865 | 2,660 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 14 | 22 | 31 | 136 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 3,427 | 1,171 | 1,142 | 684 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | (15) | 0 | 24 |
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 | 2,687 |  | 2,687 |  | 4,568
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,887 |  | 2,887 |  | 4,652
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 2,821 |  | 2,821 |  | 788
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 2,821 |  | 2,821 |  | 788
Impaired Financing Receivable, Related Allowance | 67 |  | 67 |  | $ 13
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,723 | 1,014 | 2,772 | 1,032 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 21 | 11 | 64 | 89 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 2,838 | 3,678 | 2,909 | 3,466 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 32 | 28 | 67 | 106 |
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 | 7 | 0 | $ 7 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | $ 0 | $ 0 | $ 0 | $ 0 |

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