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	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 4,479,692	$ 4,468,476
1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	20,408	28,055
Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	144,018	130,700
Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,006,163	1,005,335
Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	98,085	91,240
Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	41,359	42,877
Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	22,387	25,315
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	51,644	51,592
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,376,097	1,367,754
Performing | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	20,408	28,055
Performing | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	142,820	129,760
Performing | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,000,628	999,996
Performing | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	97,861	91,117
Performing | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	41,275	42,796
Performing | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	22,167	25,236
Performing | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	50,938	50,794
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	7,967	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	1,198	940
Nonperforming | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	5,535	5,339
Nonperforming | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	224	123
Nonperforming | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	84	81
Nonperforming | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	220	79
Nonperforming | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	706	798
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,384,064	1,375,114
Total | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	20,408	28,055
Total | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	144,018	130,700
Total | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,006,163	1,005,335
Total | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	98,085	91,240
Total | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	41,359	42,877
Total | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	22,387	25,315
Total | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 51,644	$ 51,592