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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
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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 |  |  |

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