LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Nonperforming Loans (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 4,492,174	$ 4,275,178
1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
2023	18,085	30,451
2022	23,345	16,360
2021	10,499	2,577
2020	1,209	752
2019	705	62
Prior	59	0
Revolving Loans Amortized Cost Basis	798	969
Revolving Loans Converted to Term	0	0
Total	54,700	51,171
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	0
Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
2023	15,085	34,738
2022	34,068	13,654
2021	12,757	12,903
2020	9,826	8,597
2019	7,537	7,924
Prior	33,361	38,592
Revolving Loans Amortized Cost Basis	7,025	8,484
Revolving Loans Converted to Term	5,311	0
Total	124,970	124,892
2023	0
2022	0
2021	0
2020	0
2019	10
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	10
Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
2023	117,640	229,842
2022	227,633	223,293
2021	207,985	159,924
2020	148,360	91,819
2019	82,456	50,003
Prior	205,128	184,089
Revolving Loans Amortized Cost Basis	3,360	3,561
Revolving Loans Converted to Term	0	0
Total	992,562	942,531
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	22
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	22
Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
2023	26,611	31,837
2022	27,874	17,163
2021	14,604	8,326
2020	7,409	4,956
2019	4,039	3,073
Prior	9,440	8,442
Revolving Loans Amortized Cost Basis	1,273	841
Revolving Loans Converted to Term	0	0
Total	91,250	74,638
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	0
Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
2023	8,991	10,778
2022	7,826	2,820
2021	2,771	7,911
2020	11,352	2,268
2019	1,650	2,279
Prior	11,886	10,316
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	44,476	36,372
2023	0
2022	0
2021	50
2020	4
2019	11
Prior	33
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	98
Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
2023	11,413	10,146
2022	7,661	4,637
2021	3,009	2,955
2020	1,790	2,356
2019	1,281	1,119
Prior	923	593
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	26,077	21,806
2023	0
2022	18
2021	0
2020	8
2019	7
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	33
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2023	21,183	27,102
2022	15,572	12,340
2021	7,010	5,418
2020	3,484	2,198
2019	1,607	782
Prior	1,651	1,304
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	50,507	49,144
2023	37
2022	874
2021	372
2020	86
2019	24
Prior	12
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	1,405
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,378,180	1,294,785
Performing | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
2023	18,085	30,451
2022	23,345	16,360
2021	10,499	2,577
2020	1,209	752
2019	705	62
Prior	59	0
Revolving Loans Amortized Cost Basis	798	969
Revolving Loans Converted to Term	0	0
Total	54,700	51,171
Performing | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
2023	15,085	34,738
2022	34,068	13,654
2021	12,757	12,903
2020	9,826	8,587
2019	7,537	7,924
Prior	33,347	38,127
Revolving Loans Amortized Cost Basis	7,025	8,484
Revolving Loans Converted to Term	4,759	0
Total	124,404	124,417
Performing | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
2023	117,554	229,842
2022	227,592	222,522
2021	206,943	159,651
2020	148,130	91,238
2019	81,920	49,587
Prior	202,405	181,939
Revolving Loans Amortized Cost Basis	3,167	3,375
Revolving Loans Converted to Term	0	0
Total	987,711	938,154
Performing | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
2023	26,611	31,837
2022	27,835	17,163
2021	14,604	8,326
2020	7,409	4,956
2019	4,039	3,073
Prior	9,394	8,395
Revolving Loans Amortized Cost Basis	1,230	797
Revolving Loans Converted to Term	0	0
Total	91,122	74,547
Performing | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
2023	8,991	10,778
2022	7,826	2,820
2021	2,771	7,911
2020	11,352	2,264
2019	1,645	2,265
Prior	11,859	10,308
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	44,444	36,346
Performing | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
2023	11,413	10,146
2022	7,654	4,637
2021	3,009	2,945
2020	1,783	2,349
2019	1,273	1,117
Prior	923	593
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	26,055	21,787
Performing | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2023	20,983	26,699
2022	15,172	12,120
2021	6,925	5,333
2020	3,472	2,176
2019	1,584	776
Prior	1,608	1,259
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	49,744	48,363
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total	6,362	5,769
Nonperforming | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Nonperforming | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	10
2019	0	0
Prior	14	465
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	552	0
Total	566	475
Nonperforming | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
2023	86	0
2022	41	771
2021	1,042	273
2020	230	581
2019	536	416
Prior	2,723	2,150
Revolving Loans Amortized Cost Basis	193	186
Revolving Loans Converted to Term	0	0
Total	4,851	4,377
Nonperforming | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	39	0
2021	0	0
2020	0	0
2019	0	0
Prior	46	47
Revolving Loans Amortized Cost Basis	43	44
Revolving Loans Converted to Term	0	0
Total	128	91
Nonperforming | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	0	0
2021	0	0
2020	0	4
2019	5	14
Prior	27	8
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	32	26
Nonperforming | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0	0
2022	7	0
2021	0	10
2020	7	7
2019	8	2
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	22	19
Nonperforming | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2023	200	403
2022	400	220
2021	85	85
2020	12	22
2019	23	6
Prior	43	45
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	$ 763	$ 781