OTHER BORROWINGS - Schedule of Other Borrowings (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2026	Dec. 31, 2025
Other Borrowings [Line Items]
Other borrowings	$ 1,250,049	$ 558,039
Fixed Rate Advance due July 20, 2026; fixed interest rate of 3.790%
Other Borrowings [Line Items]
Advance from correspondent bank	$ 100,000	0
Debt instrument, interest rate, effective percentage	3.79%
Fixed Rate Advance due July 21, 2026; fixed interest rate of 3.760%
Other Borrowings [Line Items]
Advance from correspondent bank	$ 75,000	0
Debt instrument, interest rate, effective percentage	3.76%
Fixed Rate Advance due July 22, 2026; fixed interest rate of 3.790%
Other Borrowings [Line Items]
Advance from correspondent bank	$ 350,000	0
Debt instrument, interest rate, effective percentage	3.79%
Fixed Rate Advance due August 11, 2026; fixed interest rate of 3.810%
Other Borrowings [Line Items]
Advance from correspondent bank	$ 250,000	0
Debt instrument, interest rate, effective percentage	3.81%
Fixed Rate Advance due August 24, 2026; fixed interest rate of 3.860%
Other Borrowings [Line Items]
Advance from correspondent bank	$ 100,000	0
Debt instrument, interest rate, effective percentage	3.86%
Daily Rate Credit due December 16, 2026; variable interest rate of 3.880%
Other Borrowings [Line Items]
Advance from correspondent bank	$ 342,000	515,000
Debt instrument, interest rate, effective percentage	3.88%
Fixed Rate Advance due March 2, 2027; fixed interest rate of 1.445%
Other Borrowings [Line Items]
Advance from correspondent bank	$ 15,000	15,000
Debt instrument, interest rate, effective percentage	1.445%
Fixed Rate Advance due March 4, 2030; fixed interest rate of 1.606%
Other Borrowings [Line Items]
Advance from correspondent bank	$ 15,000	15,000
Debt instrument, interest rate, effective percentage	1.606%
Fixed Rate Advance due December 9, 2030; fixed interest rate of 4.550%
Other Borrowings [Line Items]
Advance from correspondent bank	$ 1,350	1,355
Debt instrument, interest rate, effective percentage	4.55%
Fixed Rate Advance due December 9, 2030; fixed interest rate of 4.550%
Other Borrowings [Line Items]
Advance from correspondent bank	$ 934	938
Debt instrument, interest rate, effective percentage	4.55%
Principal Reducing Advance due September 29, 2031; fixed interest rate of 3.095%
Other Borrowings [Line Items]
Advance from correspondent bank	$ 765	838
Debt instrument, interest rate, effective percentage	3.095%
Advance from correspondent bank due July 1, 2026; secured by a loan receivable; variable interest rate at one-month SOFR plus 2.65%
Other Borrowings [Line Items]
Other borrowings	$ 0	$ 9,908
Basis spread on variable rate	2.65%