LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	$ 4,446,342	$ 4,231,742
Loans receivable	4,492,174	4,275,178
1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	54,700	51,171
Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	124,970	124,892
Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	992,562	942,531
Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	91,250	74,638
Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	44,476	36,372
Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	26,077	21,806
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	50,507	49,144
Credit Card Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	12,638	10,825
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	1,378,180	1,294,785
Loans receivable	1,378,180	1,294,785
Performing | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		51,171
Loans receivable	54,700	51,171
Performing | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		124,417
Loans receivable	124,404	124,417
Performing | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		938,154
Loans receivable	987,711	938,154
Performing | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		74,547
Loans receivable	91,122	74,547
Performing | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		36,346
Loans receivable	44,444	36,346
Performing | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		21,787
Loans receivable	26,055	21,787
Performing | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		48,363
Loans receivable	49,744	48,363
Performing | Credit Card Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	12,541	10,817
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	6,362	5,769
Loans receivable	6,362	5,769
Nonperforming | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		0
Loans receivable	0	0
Nonperforming | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		475
Loans receivable	566	475
Nonperforming | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		4,377
Loans receivable	4,851	4,377
Nonperforming | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		91
Loans receivable	128	91
Nonperforming | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		26
Loans receivable	32	26
Nonperforming | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		19
Loans receivable	22	19
Nonperforming | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		781
Loans receivable	763	781
Nonperforming | Credit Card Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	97	8
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	1,384,542	1,300,554
Loans receivable	1,384,542	1,300,554
Total | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	54,700	51,171
Loans receivable	54,700	51,171
Total | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	124,970	124,892
Loans receivable	124,970	124,892
Total | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	992,562	942,531
Loans receivable	992,562	942,531
Total | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	91,250	74,638
Loans receivable	91,250	74,638
Total | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	44,476	36,372
Loans receivable	44,476	36,372
Total | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	26,077	21,806
Loans receivable	26,077	21,806
Total | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	50,507	49,144
Loans receivable	$ 50,507	$ 49,144