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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2018
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | $ 12,156 |  | $ 12,156 |  | $ 13,037
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance | 13,731 |  | 13,731 |  | 14,621
Impaired Financing Receivable, Related Allowance | 672 |  | 672 |  | 315
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 12,276 | $ 14,574 | 12,598 | $ 15,255 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 54 | 12 | 68 | 46 |
One-to-four family |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 4,709 |  | 4,709 |  | 5,439
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 940 |  | 940 |  | 1,065
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 5,976 |  | 5,976 |  | 6,862
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 935 |  | 935 |  | 1,065
Impaired Financing Receivable, Related Allowance | 172 |  | 172 |  | 145
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 4,813 | 5,428 | 5,074 | 5,313 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 887 | 1,081 | 1,003 | 1,085 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 26 | 6 | 31 | 12 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | 1 | 0 | 2 | 0 |
Multifamily |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2,328 |  | 2,328 |  | 964
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 |  | 0 |  | 741
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 2,328 |  | 2,328 |  | 1,122
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 0 |  | 0 |  | 741
Impaired Financing Receivable, Related Allowance | 0 |  | 0 |  | 75
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,382 | 1,528 | 1,646 | 1,533 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 0 | 0 | 371 | 0 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 9 | 6 | 17 | 15 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  | 0 | 0 | 0 |
Commercial real estate |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 489 |  | 489 |  | 1,539
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 489 |  | 489 |  | 1,539
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 492 | 1,923 | 1,014 | 2,469 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 8 | 0 | 8 | 19 |
Business |  |  |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 635 |  | 635 |  | 611
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 3,055 |  | 3,055 |  | 2,678
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 940 |  | 940 |  | 611
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 3,063 |  | 3,063 |  | 2,681
Impaired Financing Receivable, Related Allowance | 500 |  | 500 |  | $ 95
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 652 | 2,037 | 623 | 2,262 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 3,050 | 2,577 | 2,867 | 2,593 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method | 6 | 0 | 6 | 0 |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method | $ 4 | $ 0 | $ 4 | $ 0 |

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