LOANS HELD FOR INVESTMENT, NET - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 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	$ 10,868,735	$ 10,871,943
Allowance for credit losses	90,455	88,751
Real Estate Collateral Dependent
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, net of fair value hedge basis point adjustments	41,351	32,891
Allowance for credit losses	1,713	2,111
Business Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	43,915	42,898	$ 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	9,032	9,290
Allowance for credit losses	1,452	1,408
Non-Owner-Occupied Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	21,075	21,876	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	31,662	22,944
Allowance for credit losses		416
Acquisition, development, and construction ("ADC")
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	2,360	2,323	$ 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