LOANS HELD FOR INVESTMENT, NET - Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Credit Risk Profile of Real Estate Loans [Abstract]
Total	$ 10,866,802		$ 10,869,328
Pass
Credit Risk Profile of Real Estate Loans [Abstract]
2025/2024	83,526		630,655
2024/2023	633,816		893,740
2023/2022	875,864		2,565,490
2022/2021	2,536,889		1,466,647
2021/2020	1,447,232		922,941
2020/2019 and Prior	3,686,378		2,858,206
Revolving	994,847		896,101
Revolving-Term	92,133		100,957
Total	10,350,685		10,334,737
Special Mention
Credit Risk Profile of Real Estate Loans [Abstract]
2025/2024			135
2024/2023	128		754
2023/2022	495		37,942
2022/2021	35,335		32,221
2021/2020	31,860		94,307
2020/2019 and Prior	202,405		121,279
Revolving	5,410		26,451
Revolving-Term	9,222		14,497
Total	284,855		327,586
Substandard
Credit Risk Profile of Real Estate Loans [Abstract]
2024/2023			398
2023/2022	378		1,985
2022/2021	3,952		18,953
2021/2020	18,953		39,164
2020/2019 and Prior	166,725		108,772
Revolving	3,749
Revolving-Term	30,491		32,038
Total	224,248		201,310
Doubtful
Credit Risk Profile of Real Estate Loans [Abstract]
2020/2019 and Prior	612		611
Total	612		611
Business Loans
Credit Risk Profile of Real Estate Loans [Abstract]
2025/2024	46,415		400,742
2024/2023	398,065		233,169
2023/2022	227,076		365,899
2022/2021	349,542		208,501
2021/2020	201,482		173,111
2020/2019 and Prior	532,035		377,523
Revolving	936,719		854,579
Revolving-Term	96,867		112,202
Total	2,788,201		2,725,726
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
YTD Gross Charge-Offs 2023/2022			158
YTD Gross Charge-Offs 2022/2021			166
YTD Gross Charge-Offs 2021/2020			267
YTD Gross Charge-Offs 2020/2019 and Prior			586
YTD Gross Charge-Offs Revolving	47		89
YTD Gross Charge-Offs Revolving-Term	129		6,785
YTD Gross Charge-Offs	176	$ 796	8,051
Business Loans | Pass
Credit Risk Profile of Real Estate Loans [Abstract]
2025/2024	46,415		400,607
2024/2023	397,937		232,017
2023/2022	226,203		327,174
2022/2021	311,457		201,799
2021/2020	195,007		164,834
2020/2019 and Prior	498,755		348,388
Revolving	927,718		828,287
Revolving-Term	58,722		67,238
Total	2,662,214		2,570,344
Business Loans | Special Mention
Credit Risk Profile of Real Estate Loans [Abstract]
2025/2024			135
2024/2023	128		754
2023/2022	495		36,740
2022/2021	34,133		4,220
2021/2020	3,993		4,333
2020/2019 and Prior	17,559		17,226
Revolving	5,252		26,292
Revolving-Term	9,222		14,497
Total	70,782		104,197
Business Loans | Substandard
Credit Risk Profile of Real Estate Loans [Abstract]
2024/2023			398
2023/2022	378		1,985
2022/2021	3,952		2,482
2021/2020	2,482		3,944
2020/2019 and Prior	15,109		11,298
Revolving	3,749
Revolving-Term	28,923		30,467
Total	54,593		50,574
Business Loans | Doubtful
Credit Risk Profile of Real Estate Loans [Abstract]
2020/2019 and Prior	612		611
Total	612		611
One-to-Four Family Residential and Cooperative/Condominium Apartment
Credit Risk Profile of Real Estate Loans [Abstract]
2025/2024	28,063		134,804
2024/2023	133,899		159,300
2023/2022	157,062		202,706
2022/2021	200,806		98,491
2021/2020	97,158		64,077
2020/2019 and Prior	309,054		255,989
Revolving	25,062		26,883
Revolving-Term	9,965		9,278
Total	961,069		951,528
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
YTD Gross Charge-Offs 2020/2019 and Prior	44
YTD Gross Charge-Offs	44
One-to-Four Family Residential and Cooperative/Condominium Apartment | Pass
Credit Risk Profile of Real Estate Loans [Abstract]
2025/2024	28,063		134,804
2024/2023	133,899		159,300
2023/2022	157,062		202,706
2022/2021	200,806		98,491
2021/2020	97,158		63,093
2020/2019 and Prior	300,119		247,952
Revolving	24,904		26,724
Revolving-Term	9,054		8,364
Total	951,065		941,434
One-to-Four Family Residential and Cooperative/Condominium Apartment | Special Mention
Credit Risk Profile of Real Estate Loans [Abstract]
2020/2019 and Prior	707		711
Revolving	158		159
Total	865		870
One-to-Four Family Residential and Cooperative/Condominium Apartment | Substandard
Credit Risk Profile of Real Estate Loans [Abstract]
2021/2020			984
2020/2019 and Prior	8,228		7,326
Revolving-Term	911		914
Total	9,139		9,224
Multifamily Residential and Residential Mixed-Use
Credit Risk Profile of Real Estate Loans [Abstract]
2025/2024			21,810
2024/2023	21,661		252,975
2023/2022	251,744		1,286,821
2022/2021	1,280,151		572,408
2021/2020	569,167		300,825
2020/2019 and Prior	1,648,101		1,376,892
Revolving	4,848		4,285
Revolving-Term	4,251		4,267
Total	3,779,923		3,820,283
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
YTD Gross Charge-Offs 2025/2024			400
YTD Gross Charge-Offs 2021/2020			1,292
YTD Gross Charge-Offs 2020/2019 and Prior			2,985
YTD Gross Charge-Offs			4,677
Multifamily Residential and Residential Mixed-Use | Pass
Credit Risk Profile of Real Estate Loans [Abstract]
2025/2024			21,810
2024/2023	21,661		252,975
2023/2022	251,744		1,285,619
2022/2021	1,278,949		560,039
2021/2020	556,818		286,653
2020/2019 and Prior	1,487,533		1,239,261
Revolving	4,848		4,285
Revolving-Term	4,251		4,267
Total	3,605,804		3,654,909
Multifamily Residential and Residential Mixed-Use | Special Mention
Credit Risk Profile of Real Estate Loans [Abstract]
2023/2022			1,202
2022/2021	1,202		12,369
2021/2020	12,349		14,172
2020/2019 and Prior	84,708		73,778
Total	98,259		101,521
Multifamily Residential and Residential Mixed-Use | Substandard
Credit Risk Profile of Real Estate Loans [Abstract]
2020/2019 and Prior	75,860		63,853
Total	75,860		63,853
Non-Owner-Occupied Commercial Real Estate
Credit Risk Profile of Real Estate Loans [Abstract]
2025/2024	6,368		57,280
2024/2023	55,167		215,279
2023/2022	206,196		724,041
2022/2021	718,908		618,637
2021/2020	610,564		518,399
2020/2019 and Prior	1,564,598		1,075,996
Revolving	12,103		11,937
Revolving-Term	16,994		8,966
Total	3,190,898		3,230,535
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
YTD Gross Charge-Offs 2022/2021			2,797
YTD Gross Charge-Offs 2021/2020			4,033
YTD Gross Charge-Offs 2020/2019 and Prior	5,259
YTD Gross Charge-Offs Revolving	1,823
YTD Gross Charge-Offs Revolving-Term			96
YTD Gross Charge-Offs	7,082		6,926
Non-Owner-Occupied Commercial Real Estate | Pass
Credit Risk Profile of Real Estate Loans [Abstract]
2025/2024	6,368		57,280
2024/2023	55,167		215,279
2023/2022	206,196		724,041
2022/2021	718,908		601,508
2021/2020	593,440		408,361
2020/2019 and Prior	1,397,639		1,020,137
Revolving	12,103		11,937
Revolving-Term	16,994		8,966
Total	3,006,815		3,047,509
Non-Owner-Occupied Commercial Real Estate | Special Mention
Credit Risk Profile of Real Estate Loans [Abstract]
2022/2021			658
2021/2020	653		75,802
2020/2019 and Prior	99,431		29,564
Total	100,084		106,024
Non-Owner-Occupied Commercial Real Estate | Substandard
Credit Risk Profile of Real Estate Loans [Abstract]
2022/2021			16,471
2021/2020	16,471		34,236
2020/2019 and Prior	67,528		26,295
Total	83,999		77,002
Non-Owner-Occupied Commercial Real Estate | Real estate loan
Credit Risk Profile of Real Estate Loans [Abstract]
Total	3,190,898		3,230,535
Acquisition, development, and construction ("ADC")
Credit Risk Profile of Real Estate Loans [Abstract]
2025/2024	2,680		16,154
2024/2023	25,152		34,169
2023/2022	34,659		25,950
2022/2021	26,769		19,784
2021/2020	19,674
2020/2019 and Prior	2,332		2,468
Revolving	25,274		24,868
Revolving-Term	3,769		12,779
Total	140,309		136,172
Acquisition, development, and construction ("ADC") | Pass
Credit Risk Profile of Real Estate Loans [Abstract]
2025/2024	2,680		16,154
2024/2023	25,152		34,169
2023/2022	34,659		25,950
2022/2021	26,769		4,810
2021/2020	4,809
2020/2019 and Prior	2,332		2,468
Revolving	25,274		24,868
Revolving-Term	3,112		12,122
Total	124,787		120,541
Acquisition, development, and construction ("ADC") | Special Mention
Credit Risk Profile of Real Estate Loans [Abstract]
2022/2021			14,974
2021/2020	14,865
Total	14,865		14,974
Acquisition, development, and construction ("ADC") | Substandard
Credit Risk Profile of Real Estate Loans [Abstract]
Revolving-Term	657		657
Total	657		657
Other Loans
Credit Risk Profile of Real Estate Loans [Abstract]
Total	6,402		5,084
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
YTD Gross Charge-Offs	35	$ 30
Other Loans | Credit Risk Profile
Credit Risk Profile of Real Estate Loans [Abstract]
Total	6,402		5,084
Other Loans | Performing | Credit Risk Profile
Credit Risk Profile of Real Estate Loans [Abstract]
Total	6,402		5,059
Other Loans | Non-accrual | Credit Risk Profile
Credit Risk Profile of Real Estate Loans [Abstract]
Total			25
Excludes Other Loans
Credit Risk Profile of Real Estate Loans [Abstract]
2025/2024	83,526		630,790
2024/2023	633,944		894,892
2023/2022	876,737		2,605,417
2022/2021	2,576,176		1,517,821
2021/2020	1,498,045		1,056,412
2020/2019 and Prior	4,056,120		3,088,868
Revolving	1,004,006		922,552
Revolving-Term	131,846		147,492
Total	10,860,400		10,864,244
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
YTD Gross Charge-Offs 2025/2024			400
YTD Gross Charge-Offs 2023/2022			158
YTD Gross Charge-Offs 2022/2021			2,963
YTD Gross Charge-Offs 2021/2020			5,592
YTD Gross Charge-Offs 2020/2019 and Prior	5,303		3,571
YTD Gross Charge-Offs Revolving	1,870		89
YTD Gross Charge-Offs Revolving-Term	129		6,881
YTD Gross Charge-Offs	$ 7,302		$ 19,654