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Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 07, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Business Acquisition [Line Items] |  |  |  |
Other assets acquisition | $ 197,100 |  |  |
Total assets |  | $ 16,020,993 | $ 16,476,540 |
Total cash and cash equivalents |  | 281,285 | 203,461 |
Premises and equipment, net |  | 44,709 | 46,698 |
Other assets |  | 127,187 | 108,946 |
Bank owned life insurance (BOLI) |  | 308,706 | 255,528 |
Interest-bearing |  | 4,227,467 | 4,671,881 |
Noninterest-bearing deposits |  | 7,206,175 | 8,164,364 |
Goodwill |  | 765,822 | 765,822 | $ 663,707
Merger related expenses |  | $ 0 | 6,013 | $ 962
Suncrest Bank [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash consideration | 39,600 |  |  |
Total assets | 1,380,000 |  |  |
Total cash and cash equivalents | 329,000 |  |  |
Premises and equipment, net | 6,100 |  |  |
Deposits premium | 3,900 |  |  |
fair value of acquired investment securities | 131,100 |  |  |
Loans receivable at fair value | 224,700 |  |  |
Fair value of liabilities assumed | 1,190,000 |  |  |
Other assets | 33,700 |  |  |
Non-recurring merger related expenses |  |  | $ 6,000 |
Bank owned life insurance (BOLI) | 9,000 |  |  |
Loans credit discount | 8,600 |  |  |
Other liabilities | 6,200 |  |  |
Interest-bearing | 669,800 |  |  |
Noninterest-bearing deposits | 512,800 |  |  |
Loan net of discount | 13,100 |  |  |
Debt Securities Carrying Amount Net | 765,900 |  |  |
Goodwill | $ 102,100 |  |  |

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