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Mergers and Acquisitions - Preliminary fair value and adjustments (Details) - USD ($) $ / shares in Units, $ in Thousands | Jan. 01, 2025 | Sep. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Investment securities |  | $ 8,505,745 |  | $ 6,798,876
Loans held for sale |  | 346,673 |  | 279,426
Loans held for investment, net of allowance for credit losses |  | 47,077,778 |  | 33,437,647
Premises and equipment, net |  | 961,510 |  | 502,559
Bank owned life insurance |  | 1,285,532 |  | 1,013,209
Deferred tax assets |  | 135,106 |  | 179,884
Goodwill |  | 3,094,059 |  | 1,923,106
Core deposit and other intangible assets |  | 409,890 |  | 66,458
Other assets |  | 669,093 |  | 433,755
Total assets |  | 66,048,210 |  | 46,381,204
Deposits: |  |  |  |
Noninterest-bearing |  | 13,430,459 |  | 10,192,117
Interest-bearing |  | 40,642,810 |  | 27,868,749
Total deposits |  | 54,073,269 |  | 38,060,866
Other liabilities |  | 1,043,048 |  | 598,295
Total liabilities |  | 57,037,084 |  | 40,490,789
Goodwill |  | 3,094,059 |  | 1,923,106
Assets |  |  |  |
Goodwill |  | 3,094,059 |  | 1,923,106
Deposits: |  |  |  |
Goodwill |  | 3,094,059 |  | 1,923,106
Consideration: |  |  |  |
Deferred tax assets |  | 135,106 |  | 179,884
Core deposit and other intangibles |  | 409,890 |  | $ 66,458
Subsequent Fair Value Adjustments |  |  |  |
ASSETS |  |  |  |
Loans held for investment, net of allowance for credit losses | $ (16,798) |  |  |
Deferred tax assets | 1,849 |  |  |
Bank property held for sale | 6,474 |  |  |
Goodwill | 6,000 |  |  |
Core deposit and other intangible assets | 2,475 |  |  |
Total assets | (6,000) |  |  |
Deposits: |  |  |  |
Net identifiable assets acquired over liabilities assumed | (6,000) |  |  |
Goodwill | 6,000 |  |  |
Assets |  |  |  |
Goodwill | 6,000 |  |  |
Deposits: |  |  |  |
Goodwill | 6,000 |  |  |
Consideration: |  |  |  |
Deferred tax assets | 1,849 |  |  |
Core deposit and other intangibles | 2,475 |  |  |
Independent |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 1,040,878 |  |  |
Investment securities | 1,590,452 |  |  |
Loans held for sale | 12,430 |  |  |
Loans held for investment, net of allowance for credit losses | 12,991,559 |  |  |
Premises and equipment, net | 315,674 |  |  |
Bank owned life insurance | 252,001 |  |  |
Deferred tax assets | 116,412 |  |  |
Bank property held for sale | 78,474 |  |  |
Goodwill | 1,170,953 | 1,200,000 | $ 1,200,000 |
Core deposit and other intangible assets | 414,553 |  |  |
Other assets | 155,587 |  |  |
Total assets | 16,968,020 |  |  |
Deposits: |  |  |  |
Noninterest-bearing | 3,238,170 |  |  |
Interest-bearing | 11,970,543 |  |  |
Total deposits | 15,208,713 |  |  |
Other borrowings | 360,522 |  |  |
Other liabilities | 96,677 |  |  |
Total liabilities | 15,665,912 |  |  |
Net identifiable assets acquired over liabilities assumed | 1,302,108 |  |  |
Goodwill | 1,170,953 | 1,200,000 | 1,200,000 |
Net assets acquired over liabilities assumed | 2,473,061 |  |  |
Assets |  |  |  |
Goodwill | 1,170,953 | 1,200,000 | 1,200,000 |
Deposits: |  |  |  |
Goodwill | $ 1,170,953 | 1,200,000 | $ 1,200,000 |
Consideration: |  |  |  |
SouthState Bank Corporation common shares issued | 24,858,731 |  |  |
Purchase price per share of the Company's common stock | $ 99.48 |  |  |
Value of shares issued | $ 2,472,947 |  |  |
Value of common stock issued for fractional shares | 114 |  |  |
Fair value of total consideration transferred | 2,473,061 |  |  |
Deferred tax assets | 116,412 |  |  |
Core deposit and other intangibles | 414,553 |  |  |
Independent | Adjusted Acquired Balance Sheet |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 1,040,878 |  |  |
Investment securities | 1,647,163 |  |  |
Loans held for sale | 12,430 |  |  |
Loans, net of allowance and mark | 13,453,678 |  |  |
Premises and equipment | 381,204 |  |  |
Bank owned life insurance | 252,001 |  |  |
Deferred tax asset | 79,189 |  |  |
Goodwill | 476,021 |  |  |
Intangible assets | 38,808 |  |  |
Other assets | 167,117 |  |  |
Total assets | 17,548,489 |  |  |
Deposits: |  |  |  |
Noninterest-bearing | 3,238,170 |  |  |
Interest-bearing | 11,968,821 |  |  |
Total deposits | 15,206,991 |  |  |
Other borrowings | 354,713 |  |  |
Other liabilities | 101,165 |  |  |
Total liabilities | 15,662,869 |  |  |
Net identifiable assets acquired over (under) liabilities assumed | 1,885,620 |  |  |
Net assets acquired over liabilities assumed | 1,885,620 |  |  |
Consideration: |  |  |  |
Investment securities | 1,647,163 |  |  |
Premises and equipment | 381,204 |  |  |
Interest-bearing | 11,968,821 |  |  |
Independent | Preliminary Fair Value Adjustments |  |  |  |
ASSETS |  |  |  |
Investment securities | (56,711) |  |  |
Loans held for investment, net of allowance for credit losses | (445,321) |  |  |
Premises and equipment, net | (65,530) |  |  |
Deferred tax assets | 35,374 |  |  |
Bank property held for sale | 72,000 |  |  |
Goodwill | 1,164,953 |  |  |
Core deposit and other intangible assets | 373,270 |  |  |
Other assets | (11,530) |  |  |
Total assets | (574,469) |  |  |
Deposits: |  |  |  |
Interest-bearing | 1,722 |  |  |
Total deposits | 1,722 |  |  |
Other borrowings | 5,809 |  |  |
Other liabilities | (4,488) |  |  |
Total liabilities | 3,043 |  |  |
Net identifiable assets acquired over liabilities assumed | (577,512) |  |  |
Goodwill | 1,164,953 |  |  |
Net assets acquired over liabilities assumed | 587,441 |  |  |
Assets |  |  |  |
Investment securities | 56,700 |  |  |
Premises and equipment | 65,500 |  |  |
Bank property held for sale | 72,000 |  |  |
Goodwill | 1,164,953 |  |  |
Goodwill | (476,021) |  |  |
Deposits: |  |  |  |
Interest-bearing | 1,700 |  |  |
Goodwill | 1,164,953 |  |  |
Consideration: |  |  |  |
Investment securities | $ 56,700 |  |  |
Percentage of preliminary credit mark | 1.60% |  |  |
Amount of preliminary credit mark | $ 214,800 |  |  |
Percentage of total preliminary credit mark | 4.40% |  |  |
Amount of total preliminary credit mark | $ 600,600 |  |  |
Amount of allowance for credit loss of acquiree | 133,000 |  |  |
Amount of fair value adjustments of acquiree reversed | 22,200 |  |  |
Premises and equipment | $ 65,500 |  |  |
Fair value adjustments with effective tax rate | 23.50% |  |  |
Deferred tax assets | $ 35,374 |  |  |
Bank property held for sale | 72,000 |  |  |
Amount of gross core deposit intangibles | $ 412,100 |  |  |
Percentage of gross core deposit intangibles | 3.60% |  |  |
Amount of existing core deposit intangibles | $ 38,800 |  |  |
Core deposit and other intangibles | 373,270 |  |  |
Value of real estate asset repossessed | 4,200 |  |  |
Amount of write off of prepaid expenses and other miscellaneous assets | 7,300 |  |  |
Interest-bearing | 1,700 |  |  |
Amount of discount and issuance costs of debt | 7,600 |  |  |
Net discount | 1,800 |  |  |
Amount of existing reserves for unfunded commitments | 2,900 |  |  |
Amount of fair value adjustments of lease liability | 2,200 |  |  |
Amount of adjustments for miscellaneous accruals for lease liability | 660 |  |  |
Independent | Subsequent Fair Value Adjustments |  |  |  |
ASSETS |  |  |  |
Deferred tax assets |  | 1,800 |  |
Core deposit and other intangible assets |  | 2,500 |  |
Consideration: |  |  |  |
Fair value adjusted due to increase in credit mark | 16,800 |  |  |
Deferred tax assets |  | 1,800 |  |
Fair value of property held for sale, net of selling costs | 6,500 |  |  |
Core deposit and other intangibles |  | $ 2,500 |  |
Independent | As previously recorded by acquiree |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 1,043,293 |  |  |
Investment securities | 1,644,381 |  |  |
Loans held for sale | 12,430 |  |  |
Loans held for investment, net of allowance for credit losses | 13,452,928 |  |  |
Premises and equipment, net | 348,071 |  |  |
Bank owned life insurance | 252,001 |  |  |
Deferred tax assets | 72,362 |  |  |
Goodwill | 476,021 |  |  |
Core deposit and other intangible assets | 38,808 |  |  |
Other assets | 226,032 |  |  |
Total assets | 17,566,327 |  |  |
Deposits: |  |  |  |
Noninterest-bearing | 3,241,446 |  |  |
Interest-bearing | 11,966,362 |  |  |
Total deposits | 15,207,808 |  |  |
Other borrowings | 354,713 |  |  |
Other liabilities | 95,409 |  |  |
Total liabilities | 15,657,930 |  |  |
Net identifiable assets acquired over liabilities assumed | 1,908,397 |  |  |
Goodwill | 476,021 |  |  |
Net assets acquired over liabilities assumed | 1,908,397 |  |  |
Assets |  |  |  |
Goodwill | 476,021 |  |  |
Deposits: |  |  |  |
Goodwill | 476,021 |  |  |
Consideration: |  |  |  |
Deferred tax assets | 72,362 |  |  |
Core deposit and other intangibles | 38,808 |  |  |
Independent | On The Line Adjustments |  |  |  |
ASSETS |  |  |  |
Deferred tax assets | 6,596 |  |  |
Other assets | (23,000) |  |  |
Total assets | (16,404) |  |  |
Deposits: |  |  |  |
Other liabilities | 6,859 |  |  |
Total liabilities | 6,859 |  |  |
Net identifiable assets acquired over liabilities assumed | (23,263) |  |  |
Net assets acquired over liabilities assumed | (23,263) |  |  |
Consideration: |  |  |  |
Deferred tax assets | 6,596 |  |  |
Independent | Reclassifications and Other Adjustments |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | (2,415) |  |  |
Investment securities | 2,782 |  |  |
Loans held for investment, net of allowance for credit losses | 750 |  |  |
Premises and equipment, net | 33,133 |  |  |
Deferred tax assets | 231 |  |  |
Other assets | (35,915) |  |  |
Total assets | (1,434) |  |  |
Deposits: |  |  |  |
Noninterest-bearing | (3,276) |  |  |
Interest-bearing | 2,459 |  |  |
Total deposits | (817) |  |  |
Other liabilities | (1,103) |  |  |
Total liabilities | (1,920) |  |  |
Net identifiable assets acquired over liabilities assumed | 486 |  |  |
Net assets acquired over liabilities assumed | 486 |  |  |
Consideration: |  |  |  |
Deferred tax assets | $ 231 |  |  |

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