LOANS HELD FOR INVESTMENT, NET - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, net of fair value hedge basis point adjustments	$ 10,870,872		$ 10,871,943
Allowance for credit losses	93,189		88,751
Real Estate Collateral Dependent
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, net of fair value hedge basis point adjustments	42,857		32,891
Allowance for credit losses	1,631		2,111
Business Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	42,965	$ 43,915	42,898	$ 37,115	$ 35,981	$ 35,962
Business Loans \| Real Estate Collateral Dependent
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, net of fair value hedge basis point adjustments	8,740		9,290
Allowance for credit losses	1,370		1,408
Non-Owner-Occupied Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	24,326	21,075	21,876	18,340	19,445	19,623
Non-Owner-Occupied Commercial Real Estate \| Real Estate Collateral Dependent
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, net of fair value hedge basis point adjustments	33,460		22,944
Allowance for credit losses			416
Acquisition, development, and construction ("ADC")
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	2,380	$ 2,360	2,323	$ 2,455	$ 2,322	$ 1,989
Acquisition, development, and construction ("ADC") \| Real Estate Collateral Dependent
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, net of fair value hedge basis point adjustments	657		657
Allowance for credit losses	$ 261		$ 287