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Loan Quality and Allowance for Loan Losses - Impairment Status of Loans Receivable (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Jun. 30, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-impaired loans | $ 4,689,543 |  | $ 4,689,543 |  | $ 4,544,634
Impaired loans with no allowance for impairment | 25,288 |  | 25,288 |  | 22,279
Recorded investment | 685 |  | 685 |  | 1,002
Allowance for impairment | (318) |  | (318) |  | (306)
Balance of impaired loans net of allowance for impairment | 367 |  | 367 |  | 696
Total impaired loans, excluding allowance for impairment: | 25,973 |  | 25,973 |  | 23,281
Loans and Leases Receivable, Gross | 4,715,516 |  | 4,715,516 |  | 4,567,915
Unpaid principal balance of impaired loans | 40,027 |  | 40,027 |  | 37,705
Average balance of impaired loans | 26,285 | $ 19,541 | 25,058 | $ 20,618 |
Interest earned on impaired loans | 60 | 43 | 171 | 131 |
Residential Mortgage [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-impaired loans | 1,311,569 |  | 1,311,569 |  | 1,285,423
Impaired loans with no allowance for impairment | 13,133 |  | 13,133 |  | 11,255
Recorded investment | 403 |  | 403 |  | 775
Allowance for impairment | (36) |  | (36) |  | (79)
Balance of impaired loans net of allowance for impairment | 367 |  | 367 |  | 696
Total impaired loans, excluding allowance for impairment: | 13,536 |  | 13,536 |  | 12,030
Loans and Leases Receivable, Gross | 1,325,105 |  | 1,325,105 |  | 1,297,453
Unpaid principal balance of impaired loans | 18,617 |  | 18,617 |  | 16,263
Average balance of impaired loans | 13,766 | 8,048 | 13,014 | 9,019 |
Interest earned on impaired loans | 32 | 33 | 97 | 99 |
Non-Residential Mortgage [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-impaired loans | 1,240,259 |  | 1,240,259 |  | 1,297,617
Impaired loans with no allowance for impairment | 8,956 |  | 8,956 |  | 5,344
Total impaired loans, excluding allowance for impairment: | 8,956 |  | 8,956 |  | 5,344
Loans and Leases Receivable, Gross | 1,249,215 |  | 1,249,215 |  | 1,302,961
Unpaid principal balance of impaired loans | 12,266 |  | 12,266 |  | 10,033
Average balance of impaired loans | 8,750 | 7,038 | 8,039 | 6,823 |
Interest earned on impaired loans |  |  |  | 4 |
Construction [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-impaired loans | 14,377 |  | 14,377 |  | 23,271
Loans and Leases Receivable, Gross | 14,377 |  | 14,377 |  | 23,271
Unpaid principal balance of impaired loans | 106 |  | 106 |  | 106
Average balance of impaired loans |  |  |  | 137 |
Commercial Business [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-impaired loans | 64,601 |  | 64,601 |  | 81,635
Impaired loans with no allowance for impairment | 1,593 |  | 1,593 |  | 3,963
Recorded investment | 282 |  | 282 |  | 227
Allowance for impairment | (282) |  | (282) |  | (227)
Total impaired loans, excluding allowance for impairment: | 1,875 |  | 1,875 |  | 4,190
Loans and Leases Receivable, Gross | 66,476 |  | 66,476 |  | 85,825
Unpaid principal balance of impaired loans | 5,350 |  | 5,350 |  | 7,671
Average balance of impaired loans | 2,143 | 2,762 | 2,352 | 2,805 |
Interest earned on impaired loans | 19 | 1 | 48 | 4 |
Other Consumer [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-impaired loans | 5,984 |  | 5,984 |  | 9,060
Loans and Leases Receivable, Gross | 5,984 |  | 5,984 |  | 9,060
Multi-Family Mortgage [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-impaired loans | 1,956,490 |  | 1,956,490 |  | 1,758,468
Impaired loans with no allowance for impairment | 81 |  | 81 |  | 116
Total impaired loans, excluding allowance for impairment: | 81 |  | 81 |  | 116
Loans and Leases Receivable, Gross | 1,956,571 |  | 1,956,571 |  | 1,758,584
Unpaid principal balance of impaired loans | 930 |  | 930 |  | 930
Average balance of impaired loans | 86 | 130 | 97 | 141 |
Home Equity Loans [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-impaired loans | 96,263 |  | 96,263 |  | 89,160
Impaired loans with no allowance for impairment | 1,525 |  | 1,525 |  | 1,601
Total impaired loans, excluding allowance for impairment: | 1,525 |  | 1,525 |  | 1,601
Loans and Leases Receivable, Gross | 97,788 |  | 97,788 |  | 90,761
Unpaid principal balance of impaired loans | 2,758 |  | 2,758 |  | $ 2,702
Average balance of impaired loans | 1,540 | 1,563 | 1,556 | 1,693 |
Interest earned on impaired loans | $ 9 | $ 9 | $ 26 | $ 24 |

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