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Loan Quality and Allowance for Loan Losses - Allowance for Loan Losses and Balance of Loans Receivable (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance | $ 33,274 | $ 30,865 |
Allowance, Loans individually evaluated for impairment | 42 |  | $ 31
Allowance, Loans collectively evaluated for impairment | 32,390 |  | 33,243
Allowance | 32,432 | 32,731 |
Loans individually evaluated for impairment | 27,489 |  | 24,259
Loans collectively evaluated for impairment | 4,625,914 |  | 4,706,368
Loans and Leases Receivable, Gross | 4,653,720 |  | 4,730,953
Loans receivable, unamortized yield adjustments | (48,982) |  | (52,025)
Loans receivable | 4,604,738 |  | 4,678,928
Total charge offs | (64) | (262) |
Total recoveries | 4 | 28 |
(Reversal of) provision for loan losses | (782) | 2,100 |
Residential Mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance | 3,377 | 2,479 |
Allowance, Loans individually evaluated for impairment | 34 |  | 31
Allowance, Loans collectively evaluated for impairment | 3,273 |  | 3,346
Allowance | 3,307 | 2,594 |
Loans individually evaluated for impairment | 11,119 |  | 12,545
Loans collectively evaluated for impairment | 1,308,549 |  | 1,331,415
Loans and Leases Receivable, Gross | 1,319,750 |  | 1,344,044
Total charge offs |  | (82) |
(Reversal of) provision for loan losses | (70) | 197 |
Non-Residential Mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance | 9,672 | 9,787 |
Allowance, Loans collectively evaluated for impairment | 9,371 |  | 9,672
Allowance | 9,371 | 9,945 |
Loans individually evaluated for impairment | 8,750 |  | 8,900
Loans collectively evaluated for impairment | 1,222,213 |  | 1,249,969
Loans and Leases Receivable, Gross | 1,230,963 |  | 1,258,869
Total charge offs |  | (54) |
Total recoveries |  | 1 |
(Reversal of) provision for loan losses | (301) | 211 |
Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance | 136 | 258 |
Allowance, Loans collectively evaluated for impairment | 140 |  | 136
Allowance | 140 | 293 |
Loans collectively evaluated for impairment | 14,637 |  | 13,907
Loans and Leases Receivable, Gross | 14,637 |  | 13,907
(Reversal of) provision for loan losses | 4 | 35 |
Commercial Business [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance | 2,467 | 2,552 |
Allowance, Loans individually evaluated for impairment | 8 |  |
Allowance, Loans collectively evaluated for impairment | 2,285 |  | 2,467
Allowance | 2,293 | 2,803 |
Loans individually evaluated for impairment | 3,083 |  | 1,213
Loans collectively evaluated for impairment | 63,571 |  | 64,308
Loans and Leases Receivable, Gross | 66,889 |  | 65,763
Total charge offs |  | (19) |
(Reversal of) provision for loan losses | (174) | 270 |
Other Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance | 172 | 413 |
Allowance, Loans collectively evaluated for impairment | 141 |  | 172
Allowance | 141 | 345 |
Loans collectively evaluated for impairment | 5,209 |  | 5,814
Loans and Leases Receivable, Gross | 5,209 |  | 5,814
Total charge offs | (64) | (107) |
Total recoveries | 4 | 27 |
(Reversal of) provision for loan losses | 29 | 12 |
Multi-Family Mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance | 16,959 | 14,946 |
Allowance, Loans collectively evaluated for impairment | 16,702 |  | 16,959
Allowance | 16,702 | 16,317 |
Loans individually evaluated for impairment | 3,061 |  | 70
Loans collectively evaluated for impairment | 1,919,907 |  | 1,946,321
Loans and Leases Receivable, Gross | 1,922,968 |  | 1,946,391
(Reversal of) provision for loan losses | (257) | 1,371 |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans acquired with deteriorated credit quality | 317 |  | 326
Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans acquired with deteriorated credit quality | 82 |  | 84
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial Business [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans acquired with deteriorated credit quality | 235 |  | 242
Home Equity Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance | 491 | 430 |
Allowance, Loans collectively evaluated for impairment | 478 |  | 491
Allowance | 478 | 434 |
Loans individually evaluated for impairment | 1,476 |  | 1,531
Loans collectively evaluated for impairment | 91,828 |  | 94,634
Loans and Leases Receivable, Gross | 93,304 |  | $ 96,165
(Reversal of) provision for loan losses | $ (13) | $ 4 |

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