LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 4,591,908	$ 4,468,476
1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	24,599	28,055
Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	157,797	130,700
Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,012,020	1,005,335
Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	100,013	91,240
Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	41,630	42,877
Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	22,280	25,315
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	53,556	51,592
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,399,611	1,367,754
Performing | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	24,599	28,055
Performing | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	156,669	129,760
Performing | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,002,339	999,996
Performing | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	99,687	91,117
Performing | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	41,436	42,796
Performing | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	22,091	25,236
Performing | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	52,790	50,794
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	12,284	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	1,128	940
Nonperforming | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	9,681	5,339
Nonperforming | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	326	123
Nonperforming | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	194	81
Nonperforming | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	189	79
Nonperforming | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	766	798
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,411,895	1,375,114
Total | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	24,599	28,055
Total | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	157,797	130,700
Total | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,012,020	1,005,335
Total | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	100,013	91,240
Total | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	41,630	42,877
Total | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	22,280	25,315
Total | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 53,556	$ 51,592