LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 4,431,398	$ 4,468,476
1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	42,919	51,207
Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	133,290	130,700
Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	989,544	990,986
Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	92,614	91,063
Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	38,318	42,877
Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	23,436	25,315
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	50,968	51,592
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,363,290	1,376,380
Performing | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	42,919	51,207
Performing | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	132,166	129,760
Performing | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	983,993	985,647
Performing | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	92,378	90,940
Performing | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	38,191	42,796
Performing | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	23,363	25,236
Performing | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	50,280	50,794
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	7,799	7,360
Nonperforming | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	0	0
Nonperforming | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,124	940
Nonperforming | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	5,551	5,339
Nonperforming | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	236	123
Nonperforming | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	127	81
Nonperforming | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	73	79
Nonperforming | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	688	798
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,371,089	1,383,740
Total | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	42,919	51,207
Total | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	133,290	130,700
Total | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	989,544	990,986
Total | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	92,614	91,063
Total | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	38,318	42,877
Total | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	23,436	25,315
Total | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 50,968	$ 51,592