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	Mar. 31, 2026	Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 6,434,020	$ 6,493,740
1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	33,131	41,659
Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	257,851	250,823
Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,746,877	1,763,071
Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	132,593	140,790
Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	51,529	48,953
Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	16,784	17,037
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	49,092	51,474
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	2,270,995	2,296,914
Performing | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	33,131	41,659
Performing | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	255,833	248,819
Performing | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,733,837	1,750,100
Performing | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	131,569	139,702
Performing | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	51,477	48,912
Performing | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	16,696	16,982
Performing | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	48,452	50,740
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	16,862	16,893
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	2,018	2,004
Nonperforming | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	13,040	12,971
Nonperforming | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,024	1,088
Nonperforming | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	52	41
Nonperforming | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	88	55
Nonperforming | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	640	734
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	2,287,857	2,313,807
Total | 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	33,131	41,659
Total | Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	257,851	250,823
Total | Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,746,877	1,763,071
Total | Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	132,593	140,790
Total | Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	51,529	48,953
Total | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	16,784	17,037
Total | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 49,092	$ 51,474