LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans by category and risk rating separated by origination and loan class (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Total	$ 4,658,117	$ 4,661,348
Current Period Gross Charge Offs
Four Year Before	3
Total	427
Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	5,112	53,158
One Year Before	54,577	284,738
Two Years Before	322,186	237,822
Three Years Before	220,024	103,393
Four Years Before	98,783	161,834
Prior	768,883	644,811
Revolving Loans	33,060	35,276
Total	1,502,625	1,521,032
Commercial real estate | Satisfactory
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	5,112	53,158
One Year Before	54,577	284,738
Two Years Before	322,082	237,822
Three Years Before	219,937	103,393
Four Years Before	98,783	161,680
Prior	748,883	624,515
Revolving Loans	33,060	35,276
Total	1,482,434	1,500,582
Commercial real estate | Watch
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Two Years Before	104
Four Years Before		154
Prior	5,097	5,348
Total	5,201	5,502
Commercial real estate | Special Mention
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Prior	4,377	4,396
Total	4,377	4,396
Commercial real estate | Classified
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Three Years Before	87
Prior	10,526	10,552
Total	10,613	10,552
Consumer
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	5,040	16,629
One Year Before	14,486	12,055
Two Years Before	10,172	6,196
Three Years Before	4,969	2,817
Four Years Before	2,229	831
Prior	12,099	12,339
Revolving Loans	121,881	122,337
Total	170,876	173,204
Current Period Gross Charge Offs
Current Year		4
One Year Before	2	135
Two year Before	80	24
Three year Before	1	3
Four Year Before		18
Prior	246	1,493
Revolving Loans	8	77
Total	340	1,754
Consumer | Satisfactory
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	5,038	16,629
One Year Before	14,466	12,010
Two Years Before	10,141	6,163
Three Years Before	4,940	2,811
Four Years Before	2,224	828
Prior	11,830	12,089
Revolving Loans	121,293	122,166
Total	169,932	172,696
Consumer | Watch
LOANS AND ALLOWANCE FOR CREDIT LOSSES
One Year Before		3
Two Years Before	3	21
Three Years Before	19	6
Four Years Before	5	3
Prior	202	201
Revolving Loans	152	154
Total	381	388
Consumer | Special Mention
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Revolving Loans	393	8
Total	393	8
Consumer | Classified
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	2
One Year Before	20	42
Two Years Before	28	12
Three Years Before	10
Prior	67	49
Revolving Loans	43	9
Total	170	112
Combined
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	33,839	302,681
One Year Before	327,153	1,275,272
Two Years Before	1,360,842	1,105,013
Three Years Before	1,068,201	430,496
Four Years Before	421,246	346,862
Prior	1,214,326	969,027
Revolving Loans	232,510	231,997
Total	4,658,117	4,661,348
Current Period Gross Charge Offs
Current Year		4
One Year Before	51	142
Two year Before	80	24
Three year Before	5	3
Four Year Before	30	18
Prior	253	2,534
Revolving Loans	8	97
Total		2,822
Combined | Satisfactory
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	33,837	302,681
One Year Before	327,133	1,274,041
Two Years Before	1,359,565	1,100,593
Three Years Before	1,063,801	430,315
Four Years Before	421,039	346,534
Prior	1,173,354	926,576
Revolving Loans	220,772	226,496
Total	4,599,501	4,607,236
Combined | Watch
LOANS AND ALLOWANCE FOR CREDIT LOSSES
One Year Before		3
Two Years Before	107	21
Three Years Before	19	6
Four Years Before	152	328
Prior	6,328	7,780
Revolving Loans	195	200
Total	6,801	8,338
Combined | Special Mention
LOANS AND ALLOWANCE FOR CREDIT LOSSES
One Year Before		1,186
Two Years Before	1,142	3,840
Three Years Before	3,755
Four Years Before	43
Prior	7,121	16,718
Revolving Loans	11,093	4,908
Total	23,154	26,652
Combined | Classified
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	2
One Year Before	20	42
Two Years Before	28	559
Three Years Before	626	175
Four Years Before	12
Prior	27,523	17,953
Revolving Loans	450	393
Total	28,661	19,122
One- to four-family residential construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	1,514	12,528
One Year Before	16,483	9,878
Two Years Before	8,388	41
Three Years Before	40
Revolving Loans	7,559	7,181
Total	33,984	29,628
One- to four-family residential construction | Satisfactory
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	1,514	12,528
One Year Before	16,483	9,878
Two Years Before	8,388	41
Three Years Before	40
Revolving Loans	7,559	7,181
Total	33,984	29,628
Subdivision construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year		532
One Year Before	288	1,022
Two Years Before	910	21,333
Three Years Before	18,629	43
Four Years Before	40	64
Prior	385	365
Total	20,252	23,359
Subdivision construction | Satisfactory
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year		532
One Year Before	288	1,022
Two Years Before	910	21,333
Three Years Before	18,629	43
Four Years Before	40	64
Prior	385	365
Total	20,252	23,359
Construction and land development
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	4,310	14,860
One Year Before	14,900	12,564
Two Years Before	8,549	5,658
Three Years Before	5,609	3,682
Four Years Before	3,663	5,458
Prior	7,863	4,531
Revolving Loans	984	1,262
Total	45,878	48,015
Construction and land development | Satisfactory
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	4,310	14,860
One Year Before	14,900	12,564
Two Years Before	8,549	5,658
Three Years Before	5,609	3,682
Four Years Before	3,663	5,458
Prior	7,863	4,531
Revolving Loans	600	878
Total	45,494	47,631
Construction and land development | Classified
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Revolving Loans	384	384
Total	384	384
Other construction
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	4,182	60,895
One Year Before	80,004	422,727
Two Years Before	445,698	203,918
Three Years Before	144,609	15,867
Four Years Before	18,057
Total	692,550	703,407
Other construction | Satisfactory
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	4,182	60,895
One Year Before	80,004	422,727
Two Years Before	445,698	203,918
Three Years Before	144,609	15,867
Four Years Before	18,057
Total	692,550	703,407
One- to four-family residential
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	8,672	66,733
One Year Before	66,264	330,489
Two Years Before	326,568	204,324
Three Years Before	196,678	108,380
Four Years Before	106,050	60,459
Prior	175,650	119,621
Revolving Loans	476	529
Total	880,358	890,535
Current Period Gross Charge Offs
One Year Before	49
Prior	7	11
Revolving Loans		20
Total	56	31
One- to four-family residential | Satisfactory
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	8,672	66,733
One Year Before	66,264	330,489
Two Years Before	326,568	203,781
Three Years Before	196,149	108,232
Four Years Before	105,903	60,288
Prior	174,438	118,570
Revolving Loans	410	483
Total	878,404	888,576
One- to four-family residential | Watch
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Four Years Before	147	171
Prior	1,016	862
Revolving Loans	43	46
Total	1,206	1,079
One- to four-family residential | Classified
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Two Years Before		543
Three Years Before	529	148
Prior	196	189
Revolving Loans	23
Total	748	880
Other residential (multi-family)
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	275	18,795
One Year Before	48,301	108,389
Two Years Before	167,404	391,516
Three Years Before	449,119	180,916
Four Years Before	182,031	108,173
Prior	189,581	130,947
Revolving Loans	3,595	3,335
Total	1,040,306	942,071
Other residential (multi-family) | Satisfactory
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	275	18,795
One Year Before	48,301	108,389
Two Years Before	167,404	391,516
Three Years Before	449,119	180,916
Four Years Before	182,031	108,173
Prior	170,103	111,462
Revolving Loans	3,595	3,335
Total	1,020,828	922,586
Other residential (multi-family) | Special Mention
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Prior	2,744	12,322
Total	2,744	12,322
Other residential (multi-family) | Classified
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Prior	16,734	7,163
Total	16,734	7,163
Commercial business
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year		58,551
One Year Before		93,410
Two Years Before		34,205
Three Years Before		15,398
Four Years Before		10,043
Prior		56,413
Revolving Loans		62,077
Total		330,097
Current Period Gross Charge Offs
One Year Before		7
Three year Before	4
Four Year Before	27
Prior		1,030
Total	31	1,037
Commercial business | Satisfactory
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	4,734	58,551
One Year Before	31,850	92,224
Two Years Before	69,825	30,361
Three Years Before	24,769	15,371
Four Years Before	10,338	10,043
Prior	59,852	55,044
Revolving Loans	54,255	57,177
Total	255,623	318,771
Commercial business | Watch
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Prior	13	1,369
Total	13	1,369
Commercial business | Special Mention
LOANS AND ALLOWANCE FOR CREDIT LOSSES
One Year Before		1,186
Two Years Before	1,142	3,840
Three Years Before	3,755
Four Years Before	43
Revolving Loans	10,700	4,900
Total	15,640	9,926
Commercial business | Classified
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Two Years Before		4
Three Years Before		27
Four Years Before	12
Total	12	$ 31
Commercial business | Consumer
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Current Year	4,734
One Year Before	31,850
Two Years Before	70,967
Three Years Before	28,524
Four Years Before	10,393
Prior	59,865
Revolving Loans	64,955
Total	$ 271,288