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Mergers and Acquisitions - Atlantic Capital (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 01, 2022 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Mergers and Acquisitions |  |  |  |  |  |
Goodwill |  | $ 1,923,106,000 |  | $ 1,923,106,000 |  | $ 1,923,106,000
Deposits: |  |  |  |  |  |
Goodwill |  | 1,923,106,000 |  | 1,923,106,000 |  | 1,923,106,000
Consideration: |  |  |  |  |  |
Reversal of CSFL's ending allowance for credit losses |  | 17,970,000 | $ 7,126,000 | 30,175,000 | $ 18,779,000 | $ 23,446,000
Atlantic Capital |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |
Shares of the common stock in exchange for each share | 0.36 |  |  |  |  |
Purchase price | $ 657,810,000 |  |  |  |  |
Loans at fair value acquired after initial fair value adjustment | 2,400,000,000 |  |  |  |  |
Estimated discount on loans | $ 54,300,000 |  |  |  |  |
Estimated discount on loans (as a percent) | 2.24% |  |  |  |  |
Loans acquired as a percentage of total loans | 10.00% |  |  |  |  |
Credit deficiencies that were identified as Purchased Credit Deteriorated ("PCD") loans. | $ 137,900,000 |  |  |  |  |
Acquisition costs |  | $ 0 | $ 7,100,000 | $ 2,400,000 | $ 15,000,000.0 |
Goodwill | 342,021,000 |  |  |  |  |
Assets |  |  |  |  |  |
Cash and cash equivalents | 250,158,000 |  |  |  |  |
Investment securities | 703,710,000 |  |  |  |  |
Loans, net of allowance and mark | 2,369,678,000 |  |  |  |  |
Premises and equipment | 19,500,000 |  |  |  |  |
Intangible assets | 20,791,000 |  |  |  |  |
Bank owned life insurance | 74,613,000 |  |  |  |  |
Deferred tax asset | 31,479,000 |  |  |  |  |
Other assets | 51,554,000 |  |  |  |  |
Total assets | 3,521,483,000 |  |  |  |  |
Deposits: |  |  |  |  |  |
Noninterest-bearing | 1,411,671,000 |  |  |  |  |
Interest-bearing | 1,616,970,000 |  |  |  |  |
Total deposits | 3,028,641,000 |  |  |  |  |
Federal funds purchased and securities sold under agreements to repurchase | 50,000,000 |  |  |  |  |
Other borrowings | 78,417,000 |  |  |  |  |
Other liabilities | 48,636,000 |  |  |  |  |
Total liabilities | 3,205,694,000 |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed | 315,789,000 |  |  |  |  |
Goodwill | 342,021,000 |  |  |  |  |
Net assets acquired over liabilities assumed | $ 657,810,000 |  |  |  |  |
Consideration: |  |  |  |  |  |
Number of shares issued as consideration | shares | 7,330,803 |  |  |  |  |
Purchase price per share of the Company's common stock | $ / shares | $ 90.00 |  |  |  |  |
Company common stock issued and cash exchanged for fractional shares. | $ 659,791,000 |  |  |  |  |
Value of shares issued | 659,772,000 |  |  |  |  |
Value of common stock issued for fractional shares | 19,000 |  |  |  |  |
Stock option conversion | 1,135,000 |  |  |  |  |
Restricted stock unit conversion | 2,870,000 |  |  |  |  |
Restricted stock awards conversion (unvested awards) | (5,986,000) |  |  |  |  |
Fair value of total consideration transferred | 657,810,000 |  |  |  |  |
Reversal of fair value adjustments | 17,200,000 |  |  |  |  |
Securities and time deposits at fair value (discount) | 30,900,000 |  |  |  |  |
HTM reclassified to AFS | $ 237,600,000 |  |  |  |  |
Credit mark of the loan portfolio (as a percent) | 1.40% |  |  |  |  |
Credit mark of the loan portfolio | $ 34,000,000.0 |  |  |  |  |
Net credit discount of the loan portfolio (as a percent) | 2.24% |  |  |  |  |
Net non-credit discount of the loan portfolio | $ 54,300,000 |  |  |  |  |
Reversal of CSFL's ending allowance for credit losses | 22,100,000 |  |  |  |  |
Fair value adjustment for reversal of deferred fees and costs | 7,600,000 |  |  |  |  |
Fair value adjustment for fixed assets and leased assets | 2,600,000 |  |  |  |  |
Core deposit intangible from a third party valuation | $ 17,500,000 |  |  |  |  |
Core deposit intangible from a third party valuation (as a percent) | 0.63 |  |  |  |  |
Serving assets from third party valuation | $ 3,200,000 |  |  |  |  |
Servicing assets written off | 19,900,000 |  |  |  |  |
Goodwill written off | $ 2,600,000 |  |  |  |  |
Deferred tax assets related to fair value adjustments with marginal tax rate | 23.90% |  |  |  |  |
Fair value negative adjustment for investment in low income housing | $ 1,100,000 |  |  |  |  |
Fair value adjustment (decrease) on write-off of prepaid assets | 233,000 |  |  |  |  |
Fair value adjustment for receivables | 154,000 |  |  |  |  |
Fair value adjustment for Small Business Investment Company ("SBIC') Investments | 7,400,000 |  |  |  |  |
Issuance costs on subordinated debt | 900,000 |  |  |  |  |
Fair value adjustment on reversal of debt issuance costs | 3,400,000 |  |  |  |  |
Reversal of an existing unfunded commitment reserve at purchase date | 2,800,000 |  |  |  |  |
Fair value adjustment to increase lease liabilities associated with rental facilities | 1,400,000 |  |  |  |  |
Fair value adjustment for reversal of uncertain tax liability | 700,000 |  |  |  |  |
Atlantic Capital | As Recorded by Atlantic Capital |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash and cash equivalents | 250,134,000 |  |  |  |  |
Investment securities | 717,332,000 |  |  |  |  |
Loans, net of allowance and mark | 2,394,256,000 |  |  |  |  |
Premises and equipment | 16,892,000 |  |  |  |  |
Intangible assets | 22,572,000 |  |  |  |  |
Bank owned life insurance | 74,613,000 |  |  |  |  |
Deferred tax asset | 30,231,000 |  |  |  |  |
Other assets | 45,274,000 |  |  |  |  |
Total assets | 3,551,304,000 |  |  |  |  |
Deposits: |  |  |  |  |  |
Noninterest-bearing | 1,411,671,000 |  |  |  |  |
Interest-bearing | 1,616,970,000 |  |  |  |  |
Total deposits | 3,028,641,000 |  |  |  |  |
Federal funds purchased and securities sold under agreements to repurchase | 50,000,000 |  |  |  |  |
Other borrowings | 74,131,000 |  |  |  |  |
Other liabilities | 50,711,000 |  |  |  |  |
Total liabilities | 3,203,483,000 |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed | 347,821,000 |  |  |  |  |
Net assets acquired over liabilities assumed | 347,821,000 |  |  |  |  |
Atlantic Capital | Initial Fair Value Adjustments |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |
Goodwill | 342,939,000 |  |  |  |  |
Assets |  |  |  |  |  |
Cash and cash equivalents | 24,000 |  |  |  |  |
Investment securities | (13,622,000) |  |  |  |  |
Loans, net of allowance and mark | (18,964,000) |  |  |  |  |
Premises and equipment | 2,608,000 |  |  |  |  |
Intangible assets | (1,781,000) |  |  |  |  |
Deferred tax asset | 2,273,000 |  |  |  |  |
Other assets | (1,277,000) |  |  |  |  |
Total assets | (30,739,000) |  |  |  |  |
Deposits: |  |  |  |  |  |
Other borrowings | 4,286,000 |  |  |  |  |
Other liabilities | (2,075,000) |  |  |  |  |
Total liabilities | 2,211,000 |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed | (32,950,000) |  |  |  |  |
Goodwill | 342,939,000 |  |  |  |  |
Net assets acquired over liabilities assumed | 309,989,000 |  |  |  |  |
Atlantic Capital | Subsequent Fair Value Adjustments |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |
Goodwill | (918,000) |  |  |  |  |
Assets |  |  |  |  |  |
Loans, net of allowance and mark | (5,614,000) |  |  |  |  |
Deferred tax asset | (1,025,000) |  |  |  |  |
Other assets | 7,557,000 |  |  |  |  |
Total assets | 918,000 |  |  |  |  |
Deposits: |  |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed | 918,000 |  |  |  |  |
Goodwill | $ (918,000) |  |  |  |  |

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