LOANS RECEIVABLE - Summary of Aging Analysis of Modifications (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Jun. 30, 2025
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	$ 3,277	$ 14,728
Current
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	31,085	22,784
30-89 Days Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0	2,582
90 Days and Over
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0	8,564
Total Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0	11,146
Multifamily
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	3,277	14,515
Multifamily \| Current
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	30,369	22,571
Multifamily \| 30-89 Days Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0	2,582
Multifamily \| 90 Days and Over
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0	8,564
Multifamily \| Total Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0	11,146
Nonresidential mortgage
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period		169
Nonresidential mortgage \| Current
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period		169
Nonresidential mortgage \| 30-89 Days Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period		0
Nonresidential mortgage \| 90 Days and Over
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period		0
Nonresidential mortgage \| Total Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period		0
Commercial
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0	44
Commercial \| Current
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	716	44
Commercial \| 30-89 Days Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0	0
Commercial \| 90 Days and Over
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	0	0
Commercial \| Total Past Due
Financing Receivable Modifications [Line Items]
Financing receivable, modified in period	$ 0	$ 0

Kearny Financial Corp. 10-Q