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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
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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 |  |  |

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