LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - LOANS - Risk Rated Loan Balances (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Financing Receivable, Recorded Investment [Line Items]
2022	$ 384,654
2021	622,967
2020	329,738
2019	194,225
2018	76,621
Prior	190,976
Revolving Loans	171,858
Total loans receivable	1,971,039	$ 1,754,175	$ 1,672,898
Pass
Financing Receivable, Recorded Investment [Line Items]
2022	384,654
2021	620,130
2020	326,070
2019	189,238
2018	73,762
Prior	179,665
Revolving Loans	168,175
Total loans receivable	1,941,694	1,719,659
Watch
Financing Receivable, Recorded Investment [Line Items]
2021	14
2020	220
2019	1,734
Prior	354
Revolving Loans	607
Total loans receivable	2,929	8,834
Special Mention
Financing Receivable, Recorded Investment [Line Items]
2021	1,602
2020	3,356
2019	889
2018	2,571
Prior	5,217
Revolving Loans	2,154
Total loans receivable	15,789	7,598
Substandard
Financing Receivable, Recorded Investment [Line Items]
2021	1,221
2020	92
2019	2,364
2018	288
Prior	5,740
Revolving Loans	922
Total loans receivable	10,627	18,084
REAL ESTATE LOANS
Financing Receivable, Recorded Investment [Line Items]
2022	236,617
2021	430,338
2020	226,958
2019	141,724
2018	39,639
Prior	140,755
Total loans receivable	1,248,513	1,090,303	981,463
REAL ESTATE LOANS | Commercial
Financing Receivable, Recorded Investment [Line Items]
2022	44,338
2021	77,669
2020	51,128
2019	41,499
2018	15,577
Prior	68,741
Revolving Loans	229
Total loans receivable	299,181	264,429
REAL ESTATE LOANS | Construction and development
Financing Receivable, Recorded Investment [Line Items]
2022	87,315
2021	146,937
2020	50,098
2019	19,325
Prior	712
Total loans receivable	304,387	240,553
REAL ESTATE LOANS | Home equity.
Financing Receivable, Recorded Investment [Line Items]
2022	4,308
2021	2,088
2020	7,138
2019	4
2018	1,423
Prior	2,078
Revolving Loans	32,253
Total loans receivable	49,292	41,017
REAL ESTATE LOANS | One-to-four-family
Financing Receivable, Recorded Investment [Line Items]
2022	71,358
2021	140,226
2020	84,623
2019	32,577
2018	18,403
Prior	43,604
Total loans receivable	390,791	366,146
REAL ESTATE LOANS | Multi-family
Financing Receivable, Recorded Investment [Line Items]
2022	29,298
2021	63,418
2020	33,971
2019	48,319
2018	4,236
Prior	25,620
Total loans receivable	204,862	178,158
REAL ESTATE LOANS | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable		1,076,201
REAL ESTATE LOANS | Pass | Commercial
Financing Receivable, Recorded Investment [Line Items]
2022	44,338
2021	77,669
2020	49,204
2019	40,786
2018	14,987
Prior	63,451
Revolving Loans	229
Total loans receivable	290,664	253,092
REAL ESTATE LOANS | Pass | Construction and development
Financing Receivable, Recorded Investment [Line Items]
2022	87,315
2021	146,937
2020	50,098
2019	19,325
Prior	712
Total loans receivable	304,387	240,553
REAL ESTATE LOANS | Pass | Home equity.
Financing Receivable, Recorded Investment [Line Items]
2022	4,308
2021	2,088
2020	7,138
2019	4
2018	1,411
Prior	1,939
Revolving Loans	32,253
Total loans receivable	49,141	40,716
REAL ESTATE LOANS | Pass | One-to-four-family
Financing Receivable, Recorded Investment [Line Items]
2022	71,358
2021	140,226
2020	84,623
2019	32,577
2018	16,443
Prior	42,805
Total loans receivable	388,032	363,682
REAL ESTATE LOANS | Pass | Multi-family
Financing Receivable, Recorded Investment [Line Items]
2022	29,298
2021	63,418
2020	33,971
2019	48,319
2018	4,236
Prior	25,620
Total loans receivable	204,862	178,158
REAL ESTATE LOANS | Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable		4,652
REAL ESTATE LOANS | Watch | Commercial
Financing Receivable, Recorded Investment [Line Items]
2020	220
2019	409
Prior	132
Total loans receivable	761	4,652
REAL ESTATE LOANS | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable		5,769
REAL ESTATE LOANS | Special Mention | Commercial
Financing Receivable, Recorded Investment [Line Items]
2020	1,704
2019	304
2018	590
Prior	5,158
Total loans receivable	7,756	5,769
REAL ESTATE LOANS | Special Mention | One-to-four-family
Financing Receivable, Recorded Investment [Line Items]
2018	1,960
Total loans receivable	1,960
REAL ESTATE LOANS | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable		3,681
REAL ESTATE LOANS | Substandard | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable		916
REAL ESTATE LOANS | Substandard | Home equity.
Financing Receivable, Recorded Investment [Line Items]
2018	12
Prior	139
Total loans receivable	151	301
REAL ESTATE LOANS | Substandard | One-to-four-family
Financing Receivable, Recorded Investment [Line Items]
Prior	799
Total loans receivable	799	2,464
CONSUMER LOANS
Financing Receivable, Recorded Investment [Line Items]
2022	130,793
2021	159,720
2020	78,601
2019	45,415
2018	32,614
Prior	36,943
Revolving Loans	1,241
Total loans receivable	485,327	422,043	396,454
CONSUMER LOANS | Indirect home improvement
Financing Receivable, Recorded Investment [Line Items]
2022	115,241
2021	142,490
2020	55,132
2019	35,994
2018	21,198
Prior	26,394
Revolving Loans	10
Total loans receivable	396,459	336,285
CONSUMER LOANS | Marine
Financing Receivable, Recorded Investment [Line Items]
2022	15,020
2021	16,430
2020	23,266
2019	9,376
2018	11,373
Prior	10,341
Total loans receivable	85,806	82,778
CONSUMER LOANS | Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
2022	532
2021	800
2020	203
2019	45
2018	43
Prior	208
Revolving Loans	1,231
Total loans receivable	3,062	2,980
CONSUMER LOANS | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable		421,414
CONSUMER LOANS | Pass | Indirect home improvement
Financing Receivable, Recorded Investment [Line Items]
2022	115,241
2021	142,356
2020	55,040
2019	35,897
2018	21,115
Prior	26,242
Revolving Loans	10
Total loans receivable	395,901	335,731
CONSUMER LOANS | Pass | Marine
Financing Receivable, Recorded Investment [Line Items]
2022	15,020
2021	16,430
2020	23,266
2019	9,376
2018	11,373
Prior	10,250
Total loans receivable	85,715	82,721
CONSUMER LOANS | Pass | Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
2022	532
2021	800
2020	203
2019	45
2018	43
Prior	208
Revolving Loans	1,231
Total loans receivable	3,062	2,962
CONSUMER LOANS | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable		629
CONSUMER LOANS | Substandard | Indirect home improvement
Financing Receivable, Recorded Investment [Line Items]
2021	134
2020	92
2019	97
2018	83
Prior	152
Total loans receivable	558	554
CONSUMER LOANS | Substandard | Marine
Financing Receivable, Recorded Investment [Line Items]
Prior	91
Total loans receivable	91	57
CONSUMER LOANS | Substandard | Other consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable		18
COMMERCIAL BUSINESS LOANS
Financing Receivable, Recorded Investment [Line Items]
2022	17,244
2021	32,909
2020	24,179
2019	7,086
2018	4,368
Prior	13,278
Revolving Loans	138,135
Total loans receivable	237,199	241,829	$ 294,981
COMMERCIAL BUSINESS LOANS | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
2022	17,244
2021	32,909
2020	24,179
2019	7,086
2018	4,368
Prior	13,278
Revolving Loans	104,267
Total loans receivable	203,331	208,552
COMMERCIAL BUSINESS LOANS | Warehouse lending
Financing Receivable, Recorded Investment [Line Items]
Revolving Loans	33,868
Total loans receivable	33,868	33,277
COMMERCIAL BUSINESS LOANS | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable		222,044
COMMERCIAL BUSINESS LOANS | Pass | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
2022	17,244
2021	30,206
2020	22,527
2019	2,909
2018	4,154
Prior	8,438
Revolving Loans	100,584
Total loans receivable	186,062	188,767
COMMERCIAL BUSINESS LOANS | Pass | Warehouse lending
Financing Receivable, Recorded Investment [Line Items]
Revolving Loans	33,868
Total loans receivable	33,868	33,277
COMMERCIAL BUSINESS LOANS | Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable		4,182
COMMERCIAL BUSINESS LOANS | Watch | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
2021	14
2019	1,325
Prior	222
Revolving Loans	607
Total loans receivable	2,168	4,182
COMMERCIAL BUSINESS LOANS | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable		1,829
COMMERCIAL BUSINESS LOANS | Special Mention | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
2021	1,602
2020	1,652
2019	585
2018	21
Prior	59
Revolving Loans	2,154
Total loans receivable	6,073	1,829
COMMERCIAL BUSINESS LOANS | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable		13,774
COMMERCIAL BUSINESS LOANS | Substandard | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
2021	1,087
2019	2,267
2018	193
Prior	4,559
Revolving Loans	922
Total loans receivable	$ 9,028	$ 13,774