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Allowance for Credit Losses - Allowance for Credit Losses and Balance of Loans Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total allowance for credit losses | $ 48,734 | $ 47,058 | $ 58,165 | $ 37,327
Loans individually analyzed | 42,600 |  |  |
Total | 5,850,476 | 5,436,576 |  |
Unaccreted yield adjustments | (21,055) | (18,731) |  |
Total loans receivable, net of yield adjustments | 5,829,421 | 5,417,845 |  |
Commercial business | Multi-family mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total allowance for credit losses | 26,362 | 25,321 |  |
Total | 2,761,775 | 2,409,090 |  |
Commercial business | Nonresidential mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total allowance for credit losses | 8,953 | 10,590 |  |
Total | 968,574 | 1,019,838 |  |
Commercial business | Commercial business |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total allowance for credit losses | 1,440 | 1,792 |  |
Total | 146,861 | 176,807 |  |
Commercial business | Construction |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total allowance for credit losses | 1,336 | 1,486 |  |
Total | 226,609 | 140,131 |  |
Residential mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total allowance for credit losses | 10,237 | 7,540 | 9,747 | 4,860
Total | 1,700,559 | 1,645,816 |  |
Consumer loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total | 46,098 | 44,894 |  |
Consumer loans | Home equity loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total allowance for credit losses | 338 | 245 | 433 | 568
Total | 43,549 | 42,028 |  |
Consumer loans | Other consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total allowance for credit losses | 68 | 84 | $ 36 | $ 58
Total | 2,549 | 2,866 |  |
Receivables Acquired with Deteriorated Credit Quality |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 3 | 26 |  |
Loans collectively evaluated | 211 | 311 |  |
Loans individually analyzed | 928 | 793 |  |
Loans collectively evaluated | 17,967 | 18,553 |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial business | Multi-family mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 0 | 0 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 0 | 0 |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial business | Nonresidential mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 70 | 73 |  |
Loans individually analyzed | 333 | 377 |  |
Loans collectively evaluated | 3,562 | 5,033 |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial business | Commercial business |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 9 | 9 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 4,237 | 1,267 |  |
Receivables Acquired with Deteriorated Credit Quality | Commercial business | Construction |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 0 | 0 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 5,735 | 5,735 |  |
Receivables Acquired with Deteriorated Credit Quality | Residential mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 3 | 0 |  |
Loans collectively evaluated | 132 | 229 |  |
Loans individually analyzed | 570 | 87 |  |
Loans collectively evaluated | 4,433 | 6,460 |  |
Receivables Acquired with Deteriorated Credit Quality | Consumer loans | Home equity loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 26 |  |
Loans collectively evaluated | 0 | 0 |  |
Loans individually analyzed | 25 | 329 |  |
Loans collectively evaluated | 0 | 58 |  |
Receivables Acquired with Deteriorated Credit Quality | Consumer loans | Other consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans 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] |  |  |  |
Loans individually analyzed | 3,417 | 3,709 |  |
Loans collectively evaluated | 45,103 | 43,012 |  |
Loans individually analyzed | 41,699 | 69,528 |  |
Loans collectively evaluated | 5,789,882 | 5,347,702 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business | Multi-family mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 326 | 849 |  |
Loans collectively evaluated | 26,036 | 24,472 |  |
Loans individually analyzed | 19,114 | 26,653 |  |
Loans collectively evaluated | 2,742,661 | 2,382,437 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business | Nonresidential mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 3,001 | 2,696 |  |
Loans collectively evaluated | 5,882 | 7,821 |  |
Loans individually analyzed | 16,207 | 31,517 |  |
Loans collectively evaluated | 948,472 | 982,911 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business | Commercial business |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 20 | 16 |  |
Loans collectively evaluated | 1,411 | 1,767 |  |
Loans individually analyzed | 252 | 293 |  |
Loans collectively evaluated | 142,372 | 175,247 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business | Construction |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 1,336 | 1,486 |  |
Loans individually analyzed | 0 | 1,561 |  |
Loans collectively evaluated | 220,874 | 132,835 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Residential mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 70 | 148 |  |
Loans collectively evaluated | 10,032 | 7,163 |  |
Loans individually analyzed | 6,101 | 8,402 |  |
Loans collectively evaluated | 1,689,455 | 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] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 338 | 219 |  |
Loans individually analyzed | 25 | 1,102 |  |
Loans collectively evaluated | 43,499 | 40,539 |  |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | 68 | 84 |  |
Loans individually analyzed | 0 | 0 |  |
Loans collectively evaluated | $ 2,549 | $ 2,866 |  |

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + 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 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (g) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B + Details
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