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Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Nov. 20, 2021 | Sep. 30, 2023 | Dec. 31, 2022 | Nov. 19, 2021
--- | --- | --- | --- | ---
Assets Acquired |  |  |  |
Goodwill |  | $ 1,320,799 | $ 1,319,598 |
Spirit of Texas Bancshares, Inc. |  |  |  |
Assets Acquired |  |  |  |
Cash and due from banks | $ 277,790 |  |  | $ 277,790
Investment securities | 348,687 |  |  | 362,088
Loans acquired | 2,294,160 |  |  | 2,314,085
Allowance for credit losses on loans | (9,623) |  |  | (17,005)
Premises and equipment | 65,061 |  |  | 84,135
Bank owned life insurance | 36,890 |  |  | 36,890
Goodwill | 0 |  |  | 77,681
Other assets | 54,992 |  |  | 58,403
Total assets acquired | 3,106,588 |  |  | 3,200,312
Liabilities Assumed |  |  |  |
Noninterest bearing transaction accounts | 824,694 |  |  | 825,228
Interest bearing transaction accounts and savings deposits | 1,383,663 |  |  | 1,383,663
Time deposits | 510,290 |  |  | 509,209
Total deposits | 2,718,647 |  |  | 2,718,100
Other borrowings | 38,050 |  |  | 37,547
Subordinated debentures | 37,370 |  |  | 36,491
Accrued interest and other liabilities | 20,356 |  |  | 23,667
Total liabilities assumed | 2,814,423 |  |  | 2,815,805
Equity | 0 |  |  | 384,507
Total liabilities and equity assumed | 2,814,423 |  |  | 3,200,312
Net assets acquired | 292,165 |  |  |
Purchase price | 466,311 |  |  |
Goodwill | 174,146 |  |  |
Spirit of Texas Bancshares, Inc. | Fair Value Adjustments |  |  |  |
Assets Acquired |  |  |  |
Cash and due from banks | 0 |  |  |
Investment securities | (13,401) |  |  |
Loans acquired | (19,925) |  |  |
Allowance for credit losses on loans | 7,382 |  |  |
Premises and equipment | (19,074) |  |  |
Bank owned life insurance | 0 |  |  |
Goodwill | (77,681) |  |  |
Other assets | (3,411) |  |  |
Total assets acquired | (93,724) |  |  |
Liabilities Assumed |  |  |  |
Noninterest bearing transaction accounts | (534) |  |  |
Interest bearing transaction accounts and savings deposits | 0 |  |  |
Time deposits | 1,081 |  |  |
Total deposits | 547 |  |  |
Other borrowings | 503 |  |  |
Subordinated debentures | 879 |  |  |
Accrued interest and other liabilities | (3,311) |  |  |
Total liabilities assumed | (1,382) |  |  |
Equity | (384,507) |  |  |
Total liabilities and equity assumed | (385,889) |  |  |
Core Deposit Premium | Spirit of Texas Bancshares, Inc. |  |  |  |
Assets Acquired |  |  |  |
Core deposit and other intangible assets | 38,631 |  |  | $ 6,245
Core Deposit Premium | Spirit of Texas Bancshares, Inc. | Fair Value Adjustments |  |  |  |
Assets Acquired |  |  |  |
Core deposit and other intangible assets | $ 32,386 |  |  |

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