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Loans Receivable and Allowance for Loan and Lease Losses Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2017
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | $ 14,548 |  | $ 14,548 |  | $ 14,693
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance | 16,616 |  | 16,616 |  | 16,141
Impaired Financing Receivable, Related Allowance | 277 |  | 277 |  | 361
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 14,632 | $ 16,133 | 15,313 | $ 15,954 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 12 | 9 | 46 | 179 |
One-to-four family |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 6,020 |  | 6,020 |  | 3,416
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 1,079 |  | 1,079 |  | 2,091
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 7,509 |  | 7,509 |  | 4,210
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 1,079 |  | 1,079 |  | 2,215
Impaired Financing Receivable, Related Allowance | 148 |  | 148 |  | 306
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 5,428 | 3,183 | 5,313 | 3,081 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 1,081 | 1,712 | 1,085 | 1,717 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 6 | 0 | 12 | 7 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 0 | 1 |
Multifamily |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,524 |  | 1,524 |  | 1,596
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 58 |  | 58 |  | 6
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,009 |  | 2,009 |  | 2,081
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 58 |  | 58 |  | 6
Impaired Financing Receivable, Related Allowance | 61 |  | 61 |  | 6
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,528 | 1,703 | 1,533 | 1,729 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 6 | 4 | 15 | 6 |
Commercial real estate |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,382 |  | 1,382 |  | 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 | 1,382 |  | 1,382 |  | 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 | 1,923 | 1,971 | 2,469 | 1,978 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 882 | 0 | 883 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 0 | 19 | 0 |
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 | 1,928 |  | 1,928 |  | 1,923
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 2,557 |  | 2,557 |  | 2,164
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,001 |  | 2,001 |  | 1,968
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 2,578 |  | 2,578 |  | 2,164
Impaired Financing Receivable, Related Allowance | 68 |  | 68 |  | 41
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,037 | 3,577 | 2,262 | 3,477 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 2,577 | 3,105 | 2,593 | 3,089 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 0 | 4 | 0 | 128 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 0 | 1 | 0 | 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 | 0 | 0 | 0 |
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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