LOANS & ALLOWANCE FOR CREDIT LOSSES - LOANS BY AMORTIZED COST BASIS BY YEAR OF ORIGINATION AND CREDIT QUALITY INDICATOR (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
2023	$ 3,842,206	$ 5,761,527
2022	5,386,784	2,409,989
2021	1,816,171	1,337,143
2020	867,067	914,995
2019	665,377	610,690
Prior	1,156,389	946,625
Revolving Loans	2,918,032	2,272,707
Total	$ 16,652,026	$ 14,253,676
As a % of total gross loans
2023	23.07%	40.42%
2022	32.35%	16.91%
2021	10.91%	9.38%
2020	5.21%	6.42%
2019	4.00%	4.28%
Prior	6.94%	6.64%
Revolving Loans	17.52%	15.95%
Total	100.00%	100.00%
Single Family - Mortgage & Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
2023	$ 730,498	$ 1,484,027
2022	1,359,272	602,342
2021	534,585	411,430
2020	347,145	324,911
2019	270,513	289,328
Prior	682,031	595,862
Revolving Loans	249,789	280,562
Total	4,173,833	3,988,462
Multifamily and Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2023	558,787	1,001,019
2022	988,022	575,258
2021	509,066	464,124
2020	354,600	269,313
2019	238,478	226,856
Prior	433,272	341,110
Revolving Loans	0	0
Total	3,082,225	2,877,680
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2023	1,896,476	2,482,366
2022	2,395,722	1,023,238
2021	669,451	383,135
2020	114,016	221,330
2019	134,215	67,265
Prior	29,914	0
Revolving Loans	960,024	603,710
Total	6,199,818	4,781,044
Commercial & Industrial - Non-RE
Financing Receivable, Credit Quality Indicator [Line Items]
2023	488,120	438,229
2022	384,197	94,585
2021	30,809	34,783
2020	26,207	62,118
2019	2,098	9,978
Prior	0	0
Revolving Loans	1,708,219	1,388,435
Total	2,639,650	2,028,128
Auto & Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2023	162,604	352,829
2022	257,571	108,381
2021	70,909	43,625
2020	25,099	37,323
2019	20,073	16,172
Prior	10,008	8,898
Revolving Loans	0	0
Total	546,264	567,228
Other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	5,721	3,057
2022	2,000	6,185
2021	1,351	46
2020	0	0
2019	0	1,091
Prior	1,164	755
Revolving Loans	0	0
Total	10,236	11,134
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2023	3,812,433	5,756,965
2022	5,259,453	2,340,720
2021	1,754,423	1,259,387
2020	765,600	848,900
2019	620,062	554,060
Prior	1,054,716	874,328
Revolving Loans	2,910,818	2,232,772
Total	16,177,505	13,867,132
Pass | Single Family - Mortgage & Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
2023	730,498	1,484,027
2022	1,346,804	600,054
2021	522,873	402,712
2020	324,458	303,999
2019	255,547	279,248
Prior	639,401	548,703
Revolving Loans	243,175	241,925
Total	4,062,756	3,860,668
Pass | Multifamily and Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2023	558,787	999,819
2022	975,186	569,486
2021	498,744	429,247
2020	314,383	259,161
2019	224,592	219,548
Prior	404,222	316,013
Revolving Loans	0	0
Total	2,975,914	2,793,274
Pass | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2023	1,867,476	2,482,366
2022	2,323,095	990,887
2021	631,500	358,422
2020	87,059	186,800
2019	117,928	28,758
Prior	0	0
Revolving Loans	960,024	602,412
Total	5,987,082	4,649,645
Pass | Commercial & Industrial - Non-RE
Financing Receivable, Credit Quality Indicator [Line Items]
2023	488,120	435,228
2022	358,214	66,226
2021	29,777	25,629
2020	14,794	61,932
2019	2,098	9,268
Prior	0	0
Revolving Loans	1,707,619	1,388,435
Total	2,600,622	1,986,718
Pass | Auto & Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2023	161,831	352,468
2022	256,154	107,882
2021	70,223	43,377
2020	24,906	37,008
2019	19,897	16,147
Prior	9,929	8,891
Revolving Loans	0	0
Total	542,940	565,773
Pass | Other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	5,721	3,057
2022	0	6,185
2021	1,306	0
2020	0	0
2019	0	1,091
Prior	1,164	721
Revolving Loans	0	0
Total	8,191	11,054
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2023	29,423	1,417
2022	69,251	32,539
2021	12,115	17,486
2020	29,593	19,827
2019	21,461	19,835
Prior	33,312	11,940
Revolving Loans	7,214	38,637
Total	202,369	141,681
Special Mention | Single Family - Mortgage & Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	7,280	0
2021	7,026	4,790
2020	8,303	2,505
2019	12,942	4,125
Prior	18,244	10,971
Revolving Loans	6,614	38,637
Total	60,409	61,028
Special Mention | Multifamily and Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	1,200
2022	9,691	0
2021	4,636	534
2020	1,360	539
2019	7,705	0
Prior	0	968
Revolving Loans	0	0
Total	23,392	3,241
Special Mention | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2023	29,000	0
2022	43,427	32,351
2021	0	12,138
2020	8,457	16,487
2019	800	15,000
Prior	15,062	0
Revolving Loans	0	0
Total	96,746	75,976
Special Mention | Commercial & Industrial - Non-RE
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	13
2022	8,221	0
2021	0	0
2020	11,413	186
2019	0	710
Prior	0	0
Revolving Loans	600	0
Total	20,234	909
Special Mention | Auto & Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2023	423	204
2022	632	188
2021	453	24
2020	60	110
2019	14	0
Prior	6	1
Revolving Loans	0	0
Total	1,588	527
Special Mention | Other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2023	350	3,145
2022	58,080	36,730
2021	49,633	60,270
2020	71,874	46,268
2019	23,854	36,795
Prior	68,361	60,357
Revolving Loans	0	1,298
Total	272,152	244,863
Substandard | Single Family - Mortgage & Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	5,188	2,288
2021	4,686	3,928
2020	14,384	18,407
2019	2,024	5,955
Prior	24,386	36,188
Revolving Loans	0	0
Total	50,668	66,766
Substandard | Multifamily and Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	3,145	5,772
2021	5,686	34,343
2020	38,857	9,613
2019	6,181	7,308
Prior	29,050	24,129
Revolving Loans	0	0
Total	82,919	81,165
Substandard | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	29,200	0
2021	37,951	12,575
2020	18,500	18,043
2019	15,487	23,507
Prior	14,852	0
Revolving Loans	0	1,298
Total	115,990	55,423
Substandard | Commercial & Industrial - Non-RE
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	2,988
2022	17,762	28,359
2021	1,032	9,154
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans	0	0
Total	18,794	40,501
Substandard | Auto & Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2023	350	157
2022	785	311
2021	233	224
2020	133	205
2019	162	25
Prior	73	6
Revolving Loans	0	0
Total	1,736	928
Substandard | Other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	2,000	0
2021	45	46
2020	0	0
2019	0	0
Prior	0	34
Revolving Loans	0	0
Total	2,045	80
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Doubtful | Single Family - Mortgage & Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Doubtful | Multifamily and Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Doubtful | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Doubtful | Commercial & Industrial - Non-RE
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Doubtful | Auto & Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Doubtful | Other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans	0	0
Total	$ 0	$ 0