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BUSINESS COMBINATION - Preliminary Purchase Price Allocation and Assets Acquired and Liabilities (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 02, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair value of liabilities assumed: |  |  |  |  |
Bargain purchase gain |  | $ 90,363,000 | $ 0 | $ 90,363,000 | $ 0
Mechanics Bank Acquisition |  |  |  |  |
Net assets identified |  |  |  |  |
Purchase price consideration | $ 265,803,348 |  |  |  |
Fair value of assets acquired: |  |  |  |  |
Cash and cash equivalents | 156,890,000 |  |  |  |
Total investment securities | 1,028,627,000 |  |  |  |
Loans held for sale | 39,489,000 |  |  |  |
Loans held for investment | 5,625,463,000 |  |  |  |
Allowance for credit losses | (63,494,000) |  |  |  |
Mortgage servicing rights | 89,704,000 |  |  |  |
Premises and equipment, net | 31,979,000 |  |  |  |
Other intangible assets, net | 114,207,000 |  |  |  |
Deferred tax assets | 81,420,000 |  |  |  |
Other assets | 283,208,000 |  |  |  |
Total assets acquired | 7,387,493,000 |  |  |  |
Fair value of liabilities assumed: |  |  |  |  |
Deposits | 5,743,725,000 |  |  |  |
FHLB advances | 1,005,370,000 |  |  |  |
Long-term debt | 193,466,000 |  |  |  |
Accrued interest payable and other liabilities | 88,766,000 |  |  |  |
Total liabilities assumed | 7,031,327,000 |  |  |  |
Net assets acquired | 356,166,000 |  |  |  |
Bargain purchase gain | $ 90,363,000 |  |  |  |

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