LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	$ 4,419,293	$ 4,231,742
Loans receivable	4,464,834	4,275,178
1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	59,735	51,171
Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	121,813	124,892
Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	967,807	942,531
Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	87,985	74,638
Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	41,774	36,372
Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	26,753	21,806
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	47,760	49,144
Credit Card Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	11,640	10,825
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	1,347,465	1,294,785
Loans receivable	1,347,465	1,294,785
Performing | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		51,171
Loans receivable	59,735	51,171
Performing | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		124,417
Loans receivable	121,314	124,417
Performing | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		938,154
Loans receivable	962,962	938,154
Performing | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		74,547
Loans receivable	87,891	74,547
Performing | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		36,346
Loans receivable	41,676	36,346
Performing | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		21,787
Loans receivable	26,736	21,787
Performing | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		48,363
Loans receivable	47,151	48,363
Performing | Credit Card Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	11,566	10,817
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	6,162	5,769
Loans receivable	6,162	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	499	475
Nonperforming | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		4,377
Loans receivable	4,845	4,377
Nonperforming | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		91
Loans receivable	94	91
Nonperforming | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		26
Loans receivable	98	26
Nonperforming | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		19
Loans receivable	17	19
Nonperforming | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable		781
Loans receivable	609	781
Nonperforming | Credit Card Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	74	8
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	1,353,627	1,300,554
Loans receivable	1,353,627	1,300,554
Total | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	59,735	51,171
Loans receivable	59,735	51,171
Total | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	121,813	124,892
Loans receivable	121,813	124,892
Total | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	967,807	942,531
Loans receivable	967,807	942,531
Total | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	87,985	74,638
Loans receivable	87,985	74,638
Total | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	41,774	36,372
Loans receivable	41,774	36,372
Total | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	26,753	21,806
Loans receivable	26,753	21,806
Total | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Net loans receivable	47,760	49,144
Loans receivable	$ 47,760	$ 49,144