LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Nonperforming Loans (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 4,591,908	$ 4,468,476
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,399,611	1,367,754
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total	12,284	7,360
1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
2024	16,645	16,968
2023	4,786	9,977
2022	2,904	251
2021	213	0
2020	0	59
Prior	51	1
Revolving Loans Amortized Cost Basis	0	799
Revolving Loans Converted to Term	0	0
Total	24,599	28,055
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
1-4 Family Construction | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2024	16,645	16,968
2023	4,786	9,977
2022	2,904	251
2021	213	0
2020	0	59
Prior	51	1
Revolving Loans Amortized Cost Basis	0	799
Revolving Loans Converted to Term	0	0
Total	24,599	28,055
1-4 Family Construction | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
2024	35,167	27,110
2023	28,691	32,027
2022	29,710	11,437
2021	10,238	9,844
2020	9,267	6,781
Prior	31,605	30,481
Revolving Loans Amortized Cost Basis	6,660	7,479
Revolving Loans Converted to Term	6,459	5,541
Total	157,797	130,700
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	10
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	10
Home equity lines of credit | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2024	35,167	27,110
2023	28,691	32,027
2022	29,710	11,437
2021	10,238	9,844
2020	9,267	6,781
Prior	31,605	30,467
Revolving Loans Amortized Cost Basis	6,660	7,479
Revolving Loans Converted to Term	5,331	4,615
Total	156,669	129,760
Home equity lines of credit | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	14
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	1,128	926
Total	1,128	940
Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
2024	74,921	141,516
2023	142,214	238,416
2022	231,034	201,581
2021	184,887	145,291
2020	135,159	78,411
Prior	240,966	196,921
Revolving Loans Amortized Cost Basis	2,839	3,199
Revolving Loans Converted to Term	0	0
Total	1,012,020	1,005,335
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	78	22
Revolving Loans Amortized Cost Basis	0	95
Revolving Loans Converted to Term	0	0
Total	78	117
Residential Mortgages secured by first liens | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2024	74,545	141,019
2023	139,745	238,242
2022	229,207	200,794
2021	183,597	144,676
2020	134,571	77,919
Prior	237,870	194,185
Revolving Loans Amortized Cost Basis	2,804	3,161
Revolving Loans Converted to Term	0	0
Total	1,002,339	999,996
Residential Mortgages secured by first liens | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2024	376	497
2023	2,469	174
2022	1,827	787
2021	1,290	615
2020	588	492
Prior	3,096	2,736
Revolving Loans Amortized Cost Basis	35	38
Revolving Loans Converted to Term	0	0
Total	9,681	5,339
Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
2024	21,801	28,685
2023	23,873	27,070
2022	24,208	14,204
2021	12,528	7,102
2020	5,961	3,888
Prior	10,277	8,875
Revolving Loans Amortized Cost Basis	1,365	1,416
Revolving Loans Converted to Term	0	0
Total	100,013	91,240
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Residential Mortgages secured by junior liens | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2024	21,801	28,685
2023	23,856	27,032
2022	24,083	14,204
2021	12,401	7,102
2020	5,961	3,888
Prior	10,260	8,833
Revolving Loans Amortized Cost Basis	1,325	1,373
Revolving Loans Converted to Term	0	0
Total	99,687	91,117
Residential Mortgages secured by junior liens | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	17	38
2022	125	0
2021	127	0
2020	0	0
Prior	17	42
Revolving Loans Amortized Cost Basis	40	43
Revolving Loans Converted to Term	0	0
Total	326	123
Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
2024	9,045	8,684
2023	6,882	8,056
2022	6,893	2,737
2021	2,443	11,274
2020	5,592	1,634
Prior	10,775	10,492
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	41,630	42,877
2024	0	0
2023	9	0
2022	0	50
2021	35	4
2020	0	16
Prior	73	49
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	117	119
Other revolving credit plans | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2024	9,045	8,684
2023	6,882	8,027
2022	6,866	2,732
2021	2,429	11,274
2020	5,569	1,634
Prior	10,645	10,445
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	41,436	42,796
Other revolving credit plans | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	29
2022	27	5
2021	14	0
2020	23	0
Prior	130	47
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	194	81
Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
2024	4,968	12,561
2023	9,427	6,851
2022	4,646	2,597
2021	1,435	1,479
2020	849	1,030
Prior	955	797
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	22,280	25,315
2024	22	18
2023	8	23
2022	1	0
2021	12	8
2020	6	7
Prior	4	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	53	56
Automobile | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2024	4,958	12,545
2023	9,311	6,800
2022	4,588	2,597
2021	1,435	1,472
2020	844	1,025
Prior	955	797
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	22,091	25,236
Automobile | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2024	10	16
2023	116	51
2022	58	0
2021	0	7
2020	5	5
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	189	79
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2024	22,595	27,485
2023	16,283	12,591
2022	6,716	5,371
2021	2,948	3,119
2020	2,481	1,477
Prior	2,533	1,549
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	53,556	51,592
2024	43	210
2023	887	1,164
2022	481	467
2021	119	96
2020	20	33
Prior	12	12
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	1,562	1,982
Other consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
2024	22,495	27,202
2023	15,931	12,261
2022	6,550	5,255
2021	2,851	3,107
2020	2,476	1,471
Prior	2,487	1,498
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	52,790	50,794
Other consumer | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
2024	100	283
2023	352	330
2022	166	116
2021	97	12
2020	5	6
Prior	46	51
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	$ 766	$ 798