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Allowance for Credit Losses - Allowance for Credit Losses and Balance of Loans Receivable (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | $ 48,877 | $ 47,613 | $ 47,058 | $ 48,216 | $ 51,785 | $ 58,165
Loans individually analyzed | 40,500 |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 6,001,107 |  | 5,436,576 |  |  |
Unaccreted yield adjustments | (16,974) |  | (18,731) |  |  |
Loans receivable | 5,984,133 |  | 5,417,845 |  |  |
Commercial Loan |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 4,233,255 |  | 3,745,866 |  |  |
Commercial Loan | Multi-family mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 27,498 | 26,246 | 25,321 | 25,795 | 24,982 | 28,450
Financing receivable, before allowance for credit loss, fee and loan in process | 2,851,721 |  | 2,409,090 |  |  |
Commercial Loan | Nonresidential mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 8,593 | 9,152 | 10,590 | 10,078 | 13,845 | 16,243
Financing receivable, before allowance for credit loss, fee and loan in process | 1,017,341 |  | 1,019,838 |  |  |
Commercial Loan | Commercial business |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 1,819 | 1,972 | 1,792 | 1,903 | 1,994 | 2,086
Financing receivable, before allowance for credit loss, fee and loan in process | 177,530 |  | 176,807 |  |  |
Commercial Loan | Construction |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 1,201 | 1,120 | 1,486 | 1,441 | 1,430 | 1,170
Financing receivable, before allowance for credit loss, fee and loan in process | 186,663 |  | 140,131 |  |  |
One-to Four-Family Residential Mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 9,355 | 8,801 | 7,540 | 8,601 | 9,129 | 9,747
Financing receivable, before allowance for credit loss, fee and loan in process | 1,719,514 |  | 1,645,816 |  |  |
Consumer Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, before allowance for credit loss, fee and loan in process | 48,338 |  | 44,894 |  |  |
Consumer Loans | Home equity loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 339 | 244 | 245 | 308 | 318 | 433
Financing receivable, before allowance for credit loss, fee and loan in process | 45,690 |  | 42,028 |  |  |
Consumer Loans | Other consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 72 | $ 78 | 84 | $ 90 | $ 87 | $ 36
Financing receivable, before allowance for credit loss, fee and loan in process | 2,648 |  | 2,866 |  |  |
Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 22 |  | 26 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 246 |  | 311 |  |  |
Loans individually analyzed | 763 |  | 793 |  |  |
Loans collectively evaluated | 18,469 |  | 18,553 |  |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial Loan | Multi-family mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 0 |  | 0 |  |  |
Loans individually analyzed | 0 |  | 0 |  |  |
Loans collectively evaluated | 0 |  | 0 |  |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial Loan | Nonresidential mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 80 |  | 73 |  |  |
Loans individually analyzed | 353 |  | 377 |  |  |
Loans collectively evaluated | 3,696 |  | 5,033 |  |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial Loan | Commercial business |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 5 |  | 9 |  |  |
Loans individually analyzed | 0 |  | 0 |  |  |
Loans collectively evaluated | 3,964 |  | 1,267 |  |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial Loan | Construction |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 0 |  | 0 |  |  |
Loans individually analyzed | 0 |  | 0 |  |  |
Loans collectively evaluated | 5,735 |  | 5,735 |  |  |
Receivables Acquired with Deteriorated Credit Quality | One-to Four-Family Residential Mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 22 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 161 |  | 229 |  |  |
Loans individually analyzed | 385 |  | 87 |  |  |
Loans collectively evaluated | 5,019 |  | 6,460 |  |  |
Receivables Acquired with Deteriorated Credit Quality | Consumer Loans | Home equity loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 |  | 26 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 0 |  | 0 |  |  |
Loans individually analyzed | 25 |  | 329 |  |  |
Loans collectively evaluated | 55 |  | 58 |  |  |
Receivables Acquired with Deteriorated Credit Quality | Consumer Loans | Other consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 0 |  | 0 |  |  |
Loans individually analyzed | 0 |  | 0 |  |  |
Loans collectively evaluated | 0 |  | 0 |  |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 2,829 |  | 3,709 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 45,780 |  | 43,012 |  |  |
Loans individually analyzed | 39,786 |  | 69,528 |  |  |
Loans collectively evaluated | 5,942,089 |  | 5,347,702 |  |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial Loan | Multi-family mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 352 |  | 849 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 27,146 |  | 24,472 |  |  |
Loans individually analyzed | 16,271 |  | 26,653 |  |  |
Loans collectively evaluated | 2,835,450 |  | 2,382,437 |  |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial Loan | Nonresidential mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 2,392 |  | 2,696 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 6,121 |  | 7,821 |  |  |
Loans individually analyzed | 17,530 |  | 31,517 |  |  |
Loans collectively evaluated | 995,762 |  | 982,911 |  |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial Loan | Commercial business |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 17 |  | 16 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 1,797 |  | 1,767 |  |  |
Loans individually analyzed | 272 |  | 293 |  |  |
Loans collectively evaluated | 173,294 |  | 175,247 |  |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial Loan | Construction |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 1,201 |  | 1,486 |  |  |
Loans individually analyzed | 0 |  | 1,561 |  |  |
Loans collectively evaluated | 180,928 |  | 132,835 |  |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | One-to Four-Family Residential Mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 68 |  | 148 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 9,104 |  | 7,163 |  |  |
Loans individually analyzed | 5,652 |  | 8,402 |  |  |
Loans collectively evaluated | 1,708,458 |  | 1,630,867 |  |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer Loans | Home equity loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 339 |  | 219 |  |  |
Loans individually analyzed | 61 |  | 1,102 |  |  |
Loans collectively evaluated | 45,549 |  | 40,539 |  |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer Loans | Other consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Financing receivable, allowance for credit losses, individually evaluated for impairment | 0 |  | 0 |  |  |
Loans acquired with deteriorated credit quality collectively evaluated | 72 |  | 84 |  |  |
Loans individually analyzed | 0 |  | 0 |  |  |
Loans collectively evaluated | $ 2,648 |  | $ 2,866 |  |  |

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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