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Loans Receivable and Allowance for Loan and Lease Losses Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2017
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | $ 12,982 |  | $ 12,982 |  | $ 14,693
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance | 14,841 |  | 14,841 |  | 16,141
Impaired Financing Receivable, Related Allowance | 344 |  | 344 |  | 361
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 13,094 | $ 16,415 | 14,542 | $ 16,672 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 22 | 13 | 69 | 192 |
One-to-four family |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 5,073 |  | 5,073 |  | 3,416
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,379 |  | 1,379 |  | 2,091
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 6,366 |  | 6,366 |  | 4,210
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,510 |  | 1,510 |  | 2,215
Impaired Financing Receivable, Related Allowance | 151 |  | 151 |  | 306
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 5,284 | 3,220 | 5,099 | 2,927 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 1,381 | 2,163 | 1,388 | 2,174 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 3 | 0 | 15 | 7 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 4 | 0 | 5 |
Multifamily |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 839 |  | 839 |  | 1,596
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 806 |  | 806 |  | 6
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 1,188 |  | 1,188 |  | 2,081
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 806 |  | 806 |  | 6
Impaired Financing Receivable, Related Allowance | 136 |  | 136 |  | 6
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,068 | 1,608 | 1,379 | 1,689 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 9 | 0 | 25 | 6 |
Commercial real estate |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 508 |  | 508 |  | 993
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 2,502
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 508 |  | 508 |  | 993
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 2,502
Impaired Financing Receivable, Related Allowance | 0 |  | 0 |  | 6
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 799 | 1,952 | 1,912 | 1,969 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 1,429 | 0 | 1,431 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 9 | 9 | 28 | 9 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 0 |
Business |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,788 |  | 1,788 |  | 1,923
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 2,589 |  | 2,589 |  | 2,164
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 1,861 |  | 1,861 |  | 1,968
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 2,602 |  | 2,602 |  | 2,164
Impaired Financing Receivable, Related Allowance | 57 |  | 57 |  | 41
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,632 | 3,459 | 2,020 | 3,842 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 2,623 | 2,581 | 2,603 | 2,639 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 128 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 1 | 0 | 1 | 37 |
Consumer |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 2
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 2
Impaired Financing Receivable, Related Allowance | 0 |  | 0 |  | $ 2
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 3 | 0 | 1 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | $ 0 | $ 0 | $ 0 | $ 0 |

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