LOANS & ALLOWANCE FOR CREDIT LOSSES -SCHEDULE OF PAST DUE LOANS AND LEASES (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Jun. 30, 2025
Financing Receivable, Past Due [Line Items]
Total	$ 26,096,037	$ 21,551,697
As a % of total gross loans	100.00%	100.00%
Current
Financing Receivable, Past Due [Line Items]
Total	$ 25,855,526	$ 21,355,691
As a % of total gross loans	99.08%	99.09%
30-59 Days
Financing Receivable, Past Due [Line Items]
Total	$ 41,874	$ 52,976
As a % of total gross loans	0.16%	0.25%
60-89 Days
Financing Receivable, Past Due [Line Items]
Total	$ 39,145	$ 24,924
As a % of total gross loans	0.15%	0.12%
90+ Days
Financing Receivable, Past Due [Line Items]
Total	$ 159,492	$ 118,106
As a % of total gross loans	0.61%	0.55%
Single Family - Mortgage & Warehouse
Financing Receivable, Past Due [Line Items]
Total	$ 4,581,772	$ 4,395,278
Single Family - Mortgage & Warehouse \| Current
Financing Receivable, Past Due [Line Items]
Total	4,517,180	4,322,681
Single Family - Mortgage & Warehouse \| 30-59 Days
Financing Receivable, Past Due [Line Items]
Total	4,142	13,302
Single Family - Mortgage & Warehouse \| 60-89 Days
Financing Receivable, Past Due [Line Items]
Total	2,755	16,395
Single Family - Mortgage & Warehouse \| 90+ Days
Financing Receivable, Past Due [Line Items]
Total	57,695	42,900
Multifamily and Commercial Mortgage
Financing Receivable, Past Due [Line Items]
Total	2,484,290	2,940,739
Multifamily and Commercial Mortgage \| Current
Financing Receivable, Past Due [Line Items]
Total	2,476,985	2,870,972
Multifamily and Commercial Mortgage \| 30-59 Days
Financing Receivable, Past Due [Line Items]
Total	3,407	36,649
Multifamily and Commercial Mortgage \| 60-89 Days
Financing Receivable, Past Due [Line Items]
Total	0	549
Multifamily and Commercial Mortgage \| 90+ Days
Financing Receivable, Past Due [Line Items]
Total	3,898	32,569
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total	8,867,851	6,937,187
Commercial Real Estate \| Current
Financing Receivable, Past Due [Line Items]
Total	8,853,128	6,900,904
Commercial Real Estate \| 30-59 Days
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial Real Estate \| 60-89 Days
Financing Receivable, Past Due [Line Items]
Total	0	7,060
Commercial Real Estate \| 90+ Days
Financing Receivable, Past Due [Line Items]
Total	14,723	29,223
Commercial & Industrial - Non-RE
Financing Receivable, Past Due [Line Items]
Total	9,495,647	6,795,497
Commercial & Industrial - Non-RE \| Current
Financing Receivable, Past Due [Line Items]
Total	9,347,305	6,783,440
Commercial & Industrial - Non-RE \| 30-59 Days
Financing Receivable, Past Due [Line Items]
Total	30,302	0
Commercial & Industrial - Non-RE \| 60-89 Days
Financing Receivable, Past Due [Line Items]
Total	35,723	0
Commercial & Industrial - Non-RE \| 90+ Days
Financing Receivable, Past Due [Line Items]
Total	82,317	12,057
Auto & Consumer
Financing Receivable, Past Due [Line Items]
Total	666,477	482,996
Auto & Consumer \| Current
Financing Receivable, Past Due [Line Items]
Total	660,928	477,694
Auto & Consumer \| 30-59 Days
Financing Receivable, Past Due [Line Items]
Total	4,023	3,025
Auto & Consumer \| 60-89 Days
Financing Receivable, Past Due [Line Items]
Total	667	920
Auto & Consumer \| 90+ Days
Financing Receivable, Past Due [Line Items]
Total	$ 859	$ 1,357