LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (portfolio of non-risk-rated loans by class and delinquency status) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financial Asset, Not Past Due
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 10,114,353	$ 9,066,075
30 to 59 Days Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, before Allowance for Credit Loss	15,814	10,527
60 to 89 Days Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, before Allowance for Credit Loss	7,429	2,142
90 Days or More Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, before Allowance for Credit Loss	9,128	6,019
Small Balance CRE [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	177,605	215,973
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	215,801	208,482
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	172,746	157,342
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	134,552	182,940
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	142,592	139,474
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	356,325	377,119
Financing Receivable, Revolving	630	533
Financing Receivable, before Allowance for Credit Loss	1,200,251	1,281,863
Small Balance CRE [Member] \| Financial Asset, Not Past Due
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	177,605	215,933
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	215,801	208,482
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	172,286	157,342
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	134,552	182,940
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	142,592	138,239
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	354,924	377,007
Financing Receivable, Revolving	630	533
Financing Receivable, before Allowance for Credit Loss	1,198,390	1,280,476
Small Balance CRE [Member] \| 30 to 59 Days Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	40
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	460	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	49
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,399	0
Financing Receivable, Revolving	0	0
Financing Receivable, before Allowance for Credit Loss	1,859	89
Small Balance CRE [Member] \| 60 to 89 Days Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, before Allowance for Credit Loss	0	0
Small Balance CRE [Member] \| 90 Days or More Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	1,186
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2	112
Financing Receivable, Revolving	0	0
Financing Receivable, before Allowance for Credit Loss	2	1,298
Small Credit-Scored Business Loans [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	307,255	235,695
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	202,200	127,296
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	99,947	109,616
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	82,297	84,666
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	56,685	56,329
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	78,617	69,763
Financing Receivable, Revolving	120,091	108,945
Financing Receivable, before Allowance for Credit Loss	947,092	792,310
Small Credit-Scored Business Loans [Member] \| Financial Asset, Not Past Due
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	307,109	235,435
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	201,628	126,959
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	99,867	109,483
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	81,603	84,460
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	56,420	55,940
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	78,025	69,504
Financing Receivable, Revolving	119,281	108,632
Financing Receivable, before Allowance for Credit Loss	943,933	790,413
Small Credit-Scored Business Loans [Member] \| 30 to 59 Days Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	146	260
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	518	268
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	54	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	262	133
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	46	74
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	280	4
Financing Receivable, Revolving	173	185
Financing Receivable, before Allowance for Credit Loss	1,479	924
Small Credit-Scored Business Loans [Member] \| 60 to 89 Days Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	54	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	133
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	275	11
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	149	9
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	7	248
Financing Receivable, Revolving	176	64
Financing Receivable, before Allowance for Credit Loss	661	465
Small Credit-Scored Business Loans [Member] \| 90 Days or More Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	69
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	26	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	157	62
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	70	306
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	305	7
Financing Receivable, Revolving	461	64
Financing Receivable, before Allowance for Credit Loss	1,019	508
One- to four-family residential [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	558,923	225,020
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	281,996	78,469
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	61,400	53,856
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	35,319	49,165
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	38,065	52,289
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	195,996	197,250
Financing Receivable, Revolving	1,413	1,425
Financing Receivable, before Allowance for Credit Loss	1,173,112	657,474
One- to four-family residential [Member] \| Financial Asset, Not Past Due
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	555,833	225,020
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	279,331	77,873
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	59,672	53,854
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	34,607	48,299
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	37,740	51,654
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	191,890	195,479
Financing Receivable, Revolving	1,335	1,425
Financing Receivable, before Allowance for Credit Loss	1,160,408	653,604
One- to four-family residential [Member] \| 30 to 59 Days Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	2,030	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	846	596
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	755	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	404
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	116	635
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,462	683
Financing Receivable, Revolving	78	0
Financing Receivable, before Allowance for Credit Loss	5,287	2,318
One- to four-family residential [Member] \| 60 to 89 Days Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	1,060	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	2
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	295
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	115	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,067	30
Financing Receivable, Revolving	0	0
Financing Receivable, before Allowance for Credit Loss	2,242	327
One- to four-family residential [Member] \| 90 Days or More Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,819	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	973	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	712	167
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	94	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,577	1,058
Financing Receivable, Revolving	0	0
Financing Receivable, before Allowance for Credit Loss	5,175	1,225
Home Equity Line of Credit [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	7,491	7,331
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,193	1,210
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	477	1,433
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,831	1,986
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,798	2,002
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	4,722	3,759
Financing Receivable, Revolving	548,779	440,812
Financing Receivable, before Allowance for Credit Loss	566,291	458,533
Home Equity Line of Credit [Member] \| Financial Asset, Not Past Due
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	7,442	7,135
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,089	1,210
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	329	1,324
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,355	1,772
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	1,611	1,764
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	3,788	2,920
Financing Receivable, Revolving	547,068	440,352
Financing Receivable, before Allowance for Credit Loss	562,682	456,477
Home Equity Line of Credit [Member] \| 30 to 59 Days Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	49	147
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	40	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	75	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	23
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	74	37
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	214	568
Financing Receivable, Revolving	1,372	210
Financing Receivable, before Allowance for Credit Loss	1,824	985
Home Equity Line of Credit [Member] \| 60 to 89 Days Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	49
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	50	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	49	45
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	45	83
Financing Receivable, Revolving	59	91
Financing Receivable, before Allowance for Credit Loss	203	268
Home Equity Line of Credit [Member] \| 90 Days or More Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	14	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	73	109
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	476	191
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	64	156
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	675	188
Financing Receivable, Revolving	280	159
Financing Receivable, before Allowance for Credit Loss	1,582	803
Consumer Loan [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	39,830	18,646
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	12,157	12,917
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	9,379	8,701
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5,724	8,398
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	5,386	6,160
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	16,755	17,092
Financing Receivable, Revolving	25,401	25,455
Financing Receivable, before Allowance for Credit Loss	114,632	97,369
Consumer Loan [Member] \| Financial Asset, Not Past Due
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	39,740	18,640
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	12,138	12,803
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	9,334	8,676
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5,695	8,242
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	5,384	6,138
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	16,675	17,055
Financing Receivable, Revolving	25,219	25,336
Financing Receivable, before Allowance for Credit Loss	114,185	96,890
Consumer Loan [Member] \| 30 to 59 Days Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	49	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	114
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	16	13
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	5	150
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	2	22
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	67	29
Financing Receivable, Revolving	120	60
Financing Receivable, before Allowance for Credit Loss	259	388
Consumer Loan [Member] \| 60 to 89 Days Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	41	6
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	9	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	29	2
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	24	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	13	8
Financing Receivable, Revolving	62	59
Financing Receivable, before Allowance for Credit Loss	178	75
Consumer Loan [Member] \| 90 Days or More Past Due [Member]
Schedule non-risk-rated loans by class and delinquency status [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	10	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	10
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	6
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, before Allowance for Credit Loss	$ 10	$ 16

LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (portfolio of non-risk-rated loans by class and delinquency status) (Details) - USD ($)
$ in Thousands