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Loan Quality and Allowance for Loan Losses - Impairment Status of Loans Receivable (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non-impaired loans | $ 4,625,914 |  | $ 4,706,368
Impaired loans with no allowance for impairment | 26,966 |  | 24,222
Recorded investment | 840 |  | 363
Allowance for impairment | (42) |  | (31)
Balance of impaired loans net of allowance for impairment | 798 |  | 332
Total impaired loans, excluding allowance for impairment: | 27,806 |  | 24,585
Loans and Leases Receivable, Gross | 4,653,720 |  | 4,730,953
Unpaid principal balance of impaired loans | 35,444 |  | 31,948
Average balance of impaired loans | 24,893 | $ 23,508 |
Interest earned on impaired loans | 122 | 44 |
Residential Mortgage [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non-impaired loans | 1,308,549 |  | 1,331,415
Impaired loans with no allowance for impairment | 10,382 |  | 12,266
Recorded investment | 819 |  | 363
Allowance for impairment | (34) |  | (31)
Balance of impaired loans net of allowance for impairment | 785 |  | 332
Total impaired loans, excluding allowance for impairment: | 11,201 |  | 12,629
Loans and Leases Receivable, Gross | 1,319,750 |  | 1,344,044
Unpaid principal balance of impaired loans | 13,565 |  | 14,985
Average balance of impaired loans | 11,770 | 12,224 |
Interest earned on impaired loans | 35 | 32 |
Non-Residential Mortgage [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non-impaired loans | 1,222,213 |  | 1,249,969
Impaired loans with no allowance for impairment | 8,750 |  | 8,900
Total impaired loans, excluding allowance for impairment: | 8,750 |  | 8,900
Loans and Leases Receivable, Gross | 1,230,963 |  | 1,258,869
Unpaid principal balance of impaired loans | 10,146 |  | 10,200
Average balance of impaired loans | 8,823 | 7,234 |
Construction [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non-impaired loans | 14,637 |  | 13,907
Loans and Leases Receivable, Gross | 14,637 |  | 13,907
Unpaid principal balance of impaired loans | 73 |  | 73
Commercial Business [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non-impaired loans | 63,571 |  | 64,308
Impaired loans with no allowance for impairment | 3,297 |  | 1,455
Recorded investment | 21 |  |
Allowance for impairment | (8) |  |
Balance of impaired loans net of allowance for impairment | 13 |  |
Total impaired loans, excluding allowance for impairment: | 3,318 |  | 1,455
Loans and Leases Receivable, Gross | 66,889 |  | 65,763
Unpaid principal balance of impaired loans | 6,270 |  | 3,987
Average balance of impaired loans | 1,951 | 2,364 |
Interest earned on impaired loans | 51 | 3 |
Other Consumer [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non-impaired loans | 5,209 |  | 5,814
Loans and Leases Receivable, Gross | 5,209 |  | 5,814
Multi-Family Mortgage [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non-impaired loans | 1,919,907 |  | 1,946,321
Impaired loans with no allowance for impairment | 3,061 |  | 70
Total impaired loans, excluding allowance for impairment: | 3,061 |  | 70
Loans and Leases Receivable, Gross | 1,922,968 |  | 1,946,391
Unpaid principal balance of impaired loans | 3,544 |  | 779
Average balance of impaired loans | 800 | 108 |
Interest earned on impaired loans | 28 |  |
Home Equity Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non-impaired loans | 91,828 |  | 94,634
Impaired loans with no allowance for impairment | 1,476 |  | 1,531
Total impaired loans, excluding allowance for impairment: | 1,476 |  | 1,531
Loans and Leases Receivable, Gross | 93,304 |  | 96,165
Unpaid principal balance of impaired loans | 1,846 |  | $ 1,924
Average balance of impaired loans | 1,549 | 1,578 |
Interest earned on impaired loans | $ 8 | $ 9 |

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