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LOANS AND CREDIT QUALITY - Loan and Lease Receivable Portfolio (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Loans held for investment |  |  |  |  |  |
Total loan and lease receivables before allowance for credit losses | $ 14,568,795 |  | $ 9,643,497 |  |  |
Allowance for credit losses on loans and leases | (168,959) | $ (68,334) | (88,558) | $ (103,481) | $ (108,021) | $ (133,778)
Net loan and lease receivables | 14,399,836 |  | 9,554,939 |  |  |
Commercial and industrial |  |  |  |  |  |
Loans held for investment |  |  |  |  |  |
Total loan and lease receivables before allowance for credit losses | 547,311 |  | 410,040 |  |  |
Allowance for credit losses on loans and leases | (23,244) | (3,456) | (4,869) | (5,005) | (5,409) | (5,805)
Commercial real estate |  |  |  |  |  |
Loans held for investment |  |  |  |  |  |
Total loan and lease receivables before allowance for credit losses | 5,448,374 |  | 2,794,581 |  |  |
Allowance for credit losses on loans and leases | (101,063) | (33,599) | (35,097) | (34,682) | (34,092) | (31,486)
Commercial real estate | Multifamily |  |  |  |  |  |
Loans held for investment |  |  |  |  |  |
Total loan and lease receivables before allowance for credit losses | 5,448,374 |  | 2,794,581 |  |  |
Commercial real estate | Construction and land development |  |  |  |  |  |
Loans held for investment |  |  |  |  |  |
Total loan and lease receivables before allowance for credit losses | 535,776 |  | 104,430 |  |  |
Commercial real estate | Non-owner occupied |  |  |  |  |  |
Loans held for investment |  |  |  |  |  |
Total loan and lease receivables before allowance for credit losses | 1,864,040 |  | 1,657,597 |  |  |
Commercial real estate | Owner occupied |  |  |  |  |  |
Loans held for investment |  |  |  |  |  |
Total loan and lease receivables before allowance for credit losses | 709,239 |  | 360,100 |  |  |
Residential Real Estate |  |  |  |  |  |
Loans held for investment |  |  |  |  |  |
Total loan and lease receivables before allowance for credit losses | 3,907,101 |  | 2,280,963 |  |  |
Allowance for credit losses on loans and leases | (22,193) | (4,977) | (4,656) | (6,799) | (6,741) | (6,745)
Auto |  |  |  |  |  |
Loans held for investment |  |  |  |  |  |
Total loan and lease receivables before allowance for credit losses | 954,615 |  | 1,596,935 |  |  |
Allowance for credit losses on loans and leases | (19,733) | (23,867) | (41,282) | (54,135) | (58,698) | (87,053)
Other consumer |  |  |  |  |  |
Loans held for investment |  |  |  |  |  |
Total loan and lease receivables before allowance for credit losses | 602,339 |  | 438,851 |  |  |
Allowance for credit losses on loans and leases | $ (2,726) | $ (2,435) | $ (2,654) | $ (2,860) | $ (3,081) | $ (2,689)

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