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, 2026	Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 6,513,861	$ 6,493,740
1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	34,599	41,659
Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	265,398	250,823
Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,743,623	1,763,071
Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	138,349	140,790
Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	52,661	48,953
Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	14,984	17,037
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	48,701	51,474
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	2,281,622	2,296,914
Performing \| 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	34,599	41,659
Performing \| Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	262,840	248,819
Performing \| Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,731,327	1,750,100
Performing \| Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	137,354	139,702
Performing \| Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	52,562	48,912
Performing \| Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	14,803	16,982
Performing \| Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	48,137	50,740
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	16,693	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	2,558	2,004
Nonperforming \| Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	12,296	12,971
Nonperforming \| Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	995	1,088
Nonperforming \| Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	99	41
Nonperforming \| Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	181	55
Nonperforming \| Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	564	734
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	2,298,315	2,313,807
Total \| 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	34,599	41,659
Total \| Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	265,398	250,823
Total \| Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,743,623	1,763,071
Total \| Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	138,349	140,790
Total \| Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	52,661	48,953
Total \| Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	14,984	17,037
Total \| Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 48,701	$ 51,474