LOANS HELD FOR INVESTMENT, NET - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	$ 10,116,941		$ 9,244,661
Allowance for credit losses	81,935	$ 79,426	83,853	$ 81,255	$ 92,760	$ 41,461
Commercial real estate ("CRE")
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	4,264,519		3,945,948
Allowance for credit losses	28,551	26,247	29,166	29,603	41,201	9,059
Acquisition, development, and construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	241,019		322,628
Allowance for credit losses	3,619	3,788	4,857	5,019	5,158	1,993
Commercial and Industrial ("C&I") Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	912,151		933,559
Allowance for credit losses	36,448	37,588	35,331	31,545	30,095	12,737
Total real estate loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	9,195,863		8,294,204
Allowance for credit losses	45,282	$ 41,552	47,771	$ 49,033	$ 62,166	$ 28,712
Real Estate Collateral Dependent | Commercial real estate ("CRE")
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	6,732		3,837
Allowance for credit losses	1,432		600
Real Estate Collateral Dependent | Acquisition, development, and construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	657
Real Estate Collateral Dependent | Commercial and Industrial ("C&I") Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	818		348
Real Estate Collateral Dependent | Total real estate loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Loans	8,207		4,185
Allowance for credit losses	$ 1,432		$ 600