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LOANS & ALLOWANCE FOR CREDIT LOSSES - LOANS BY AMORTIZED COST BASIS BY YEAR OF ORIGINATION AND CREDIT QUALITY INDICATOR (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 $ 1,084,949 $ 3,568,319
2024 3,498,290 3,368,194
2023 2,997,931 4,352,535
2022 3,990,222 1,433,787
2021 1,252,794 904,402
Prior 2,434,494 1,732,247
Revolving Loans 4,567,154 4,443,327
Total 19,825,834 19,802,811
Year-to-date gross charge-offs    
2025 0 202
2024 197 3,471
2023 626 5,212
2022 1,354 1,556
2021 1,526 943
Prior 3,535 525
Revolving Loans 2,000 0
Total $ 9,238 $ 11,909
As a % of total gross loans    
2025 5.50% 18.00%
2024 17.60% 17.00%
2023 15.10% 22.00%
2022 20.10% 7.20%
2021 6.30% 4.60%
Prior 12.30% 8.80%
Revolving Loans 23.10% 22.40%
Total 100.00% 100.00%
Single Family - Mortgage & Warehouse    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 $ 123,052 $ 522,822
2024 465,335 590,343
2023 551,156 1,231,447
2022 1,188,626 487,797
2021 481,624 312,358
Prior 996,502 777,287
Revolving Loans 345,288 256,778
Total 4,151,583 4,178,832
Year-to-date gross charge-offs    
2025 0 0
2024 0 0
2023 0 0
2022 0 0
2021 0 0
Prior 0 172
Revolving Loans 0 0
Total 0 172
Multifamily and Commercial Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 6,410 36,058
2024 30,848 742,977
2023 685,202 1,052,707
2022 1,072,354 628,284
2021 531,461 560,365
Prior 1,321,194 841,540
Revolving Loans 0 0
Total 3,647,469 3,861,931
Year-to-date gross charge-offs    
2025 0 0
2024 0 0
2023 0 0
2022 0 0
2021 0 640
Prior 3,357 0
Revolving Loans 0 0
Total 3,357 640
Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 725,167 1,952,001
2024 2,003,149 1,424,999
2023 1,159,022 1,527,795
2022 1,278,166 226,061
2021 154,659 7,741
Prior 60,339 83,339
Revolving Loans 875,763 866,686
Total 6,256,265 6,088,622
Year-to-date gross charge-offs    
2025 0 0
2024 0 0
2023 0 0
2022 0 0
2021 0 0
Prior 0 0
Revolving Loans 0 0
Total 0 0
Commercial & Industrial - Non-RE    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 201,920 991,497
2024 936,790 494,500
2023 498,560 361,857
2022 290,626 47,772
2021 46,473 10,422
Prior 34,280 15,855
Revolving Loans 3,346,103 3,319,863
Total 5,354,752 5,241,766
Year-to-date gross charge-offs    
2025 0 0
2024 0 0
2023 0 0
2022 0 0
2021 1,032 0
Prior 0 84
Revolving Loans 2,000 0
Total 3,032 84
Auto & Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 28,400 65,941
2024 62,168 115,375
2023 103,991 178,729
2022 160,450 43,873
2021 38,577 13,516
Prior 22,179 14,226
Revolving Loans 0 0
Total 415,765 431,660
Year-to-date gross charge-offs    
2025 0 202
2024 197 3,471
2023 626 5,212
2022 1,354 1,556
2021 494 303
Prior 178 269
Revolving Loans 0 0
Total 2,849 11,013
Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 1,084,949 3,537,144
2024 3,390,115 3,282,691
2023 2,915,128 4,066,317
2022 3,740,544 1,391,702
2021 1,193,183 832,953
Prior 2,232,997 1,611,156
Revolving Loans 4,516,795 4,418,889
Total 19,073,711 19,140,852
Pass | Single Family - Mortgage & Warehouse    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 123,052 491,822
2024 434,335 590,060
2023 550,071 1,200,230
2022 1,171,584 487,132
2021 476,230 291,047
Prior 912,453 720,049
Revolving Loans 345,288 256,778
Total 4,013,013 4,037,118
Pass | Multifamily and Commercial Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 6,410 36,058
2024 30,848 700,163
2023 652,262 994,004
2022 1,023,889 595,299
2021 493,090 510,341
Prior 1,221,788 811,184
Revolving Loans 0 0
Total 3,428,287 3,647,049
Pass | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 725,167 1,952,001
2024 1,939,760 1,419,399
2023 1,144,414 1,456,643
2022 1,234,466 221,061
2021 143,009 7,741
Prior 45,487 53,000
Revolving Loans 871,853 866,686
Total 6,104,156 5,976,531
Pass | Commercial & Industrial - Non-RE    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 201,920 991,497
2024 923,047 458,454
2023 465,232 238,397
2022 151,653 44,923
2021 42,580 10,422
Prior 31,291 12,867
Revolving Loans 3,299,654 3,295,425
Total 5,115,377 5,051,985
Pass | Auto & Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 28,400 65,766
2024 62,125 114,615
2023 103,149 177,043
2022 158,952 43,287
2021 38,274 13,402
Prior 21,978 14,056
Revolving Loans 0 0
Total 412,878 428,169
Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 31,033
2024 107,923 31,151
2023 24,435 99,288
2022 49,472 20,137
2021 18,331 15,602
Prior 87,271 37,211
Revolving Loans 4,284 5,349
Total 291,716 239,771
Special Mention | Single Family - Mortgage & Warehouse    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 31,000
2024 31,000 0
2023 0 24,489
2022 7,374 665
2021 5,394 6,591
Prior 34,621 26,873
Revolving Loans 0 0
Total 78,389 89,618
Special Mention | Multifamily and Commercial Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 0
2024 0 29,325
2023 23,774 46,194
2022 41,030 17,478
2021 8,975 9,011
Prior 52,624 10,277
Revolving Loans 0 0
Total 126,403 112,285
Special Mention | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 0
2024 63,389 0
2023 0 27,452
2022 0 0
2021 0 0
Prior 0 0
Revolving Loans 0 0
Total 63,389 27,452
Special Mention | Commercial & Industrial - Non-RE    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 0
2024 13,500 1,613
2023 386 731
2022 678 1,818
2021 3,893 0
Prior 0 0
Revolving Loans 4,284 5,349
Total 22,741 9,511
Special Mention | Auto & Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 33
2024 34 213
2023 275 422
2022 390 176
2021 69 0
Prior 26 61
Revolving Loans 0 0
Total 794 905
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 142
2024 252 54,352
2023 58,368 186,930
2022 190,206 21,948
2021 41,280 55,847
Prior 114,226 83,880
Revolving Loans 46,075 19,089
Total 450,407 422,188
Substandard | Single Family - Mortgage & Warehouse    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 0
2024 0 283
2023 1,085 6,728
2022 9,668 0
2021 0 14,720
Prior 49,428 30,365
Revolving Loans 0 0
Total 60,181 52,096
Substandard | Multifamily and Commercial Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 0
2024 0 13,489
2023 9,166 12,509
2022 7,435 15,507
2021 29,396 41,013
Prior 46,782 20,079
Revolving Loans 0 0
Total 92,779 102,597
Substandard | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 0
2024 0 5,600
2023 14,608 43,700
2022 43,700 5,000
2021 11,650 0
Prior 14,852 30,339
Revolving Loans 3,910 0
Total 88,720 84,639
Substandard | Commercial & Industrial - Non-RE    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 0
2024 243 34,433
2023 32,942 122,729
2022 128,295 1,031
2021 0 0
Prior 2,989 2,988
Revolving Loans 42,165 19,089
Total 206,634 180,270
Substandard | Auto & Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 142
2024 9 547
2023 567 1,264
2022 1,108 410
2021 234 114
Prior 175 109
Revolving Loans 0 0
Total 2,093 2,586
Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 0
2024 0 0
2023 0 0
2022 10,000 0
2021 0 0
Prior 0 0
Revolving Loans 0 0
Total 10,000 0
Doubtful | Single Family - Mortgage & Warehouse    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 0
2024 0 0
2023 0 0
2022 0 0
2021 0 0
Prior 0 0
Revolving Loans 0 0
Total 0 0
Doubtful | Multifamily and Commercial Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 0
2024 0 0
2023 0 0
2022 0 0
2021 0 0
Prior 0 0
Revolving Loans 0 0
Total 0 0
Doubtful | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 0
2024 0 0
2023 0 0
2022 0 0
2021 0 0
Prior 0 0
Revolving Loans 0 0
Total 0 0
Doubtful | Commercial & Industrial - Non-RE    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 0
2024 0 0
2023 0 0
2022 10,000 0
2021 0 0
Prior 0 0
Revolving Loans 0 0
Total 10,000 0
Doubtful | Auto & Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 0 0
2024 0 0
2023 0 0
2022 0 0
2021 0 0
Prior 0 0
Revolving Loans 0 0
Total $ 0 $ 0