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, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 6,468,196	$ 4,608,956
1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	47,631	26,431
Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	230,440	166,327
Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,733,513	1,012,746
Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	139,783	106,462
Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	43,666	41,095
Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	18,459	20,961
Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	52,456	53,821
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	2,252,824	1,416,673
Performing \| 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	47,631	26,431
Performing \| Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	228,782	165,490
Performing \| Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,723,230	1,003,653
Performing \| Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	139,414	106,191
Performing \| Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	43,635	40,941
Performing \| Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	18,395	20,895
Performing \| Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	51,737	53,072
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	13,124	11,170
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	1,658	837
Nonperforming \| Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	10,283	9,093
Nonperforming \| Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	369	271
Nonperforming \| Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	31	154
Nonperforming \| Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	64	66
Nonperforming \| Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	719	749
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	2,265,948	1,427,843
Total \| 1-4 Family Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	47,631	26,431
Total \| Home equity lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	230,440	166,327
Total \| Residential Mortgages secured by first liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	1,733,513	1,012,746
Total \| Residential Mortgages secured by junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	139,783	106,462
Total \| Other revolving credit plans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	43,666	41,095
Total \| Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	18,459	20,961
Total \| Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans receivable	$ 52,456	$ 53,821