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Mergers and Acquisitions- CSFL (Details) |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 01, 2021 USD ($) | Jun. 07, 2020 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) $ / shares | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |  |  |
Goodwill |  |  | $ 1,581,085,000 |  |  | $ 1,581,085,000 |  | $ 1,563,942,000
Additional information |  |  |  |  |  |  |  |
Reversal of CSFL's ending allowance for credit losses |  |  | 3,847,000 | $ 4,642,000 |  | 12,883,000 | $ 10,296,000 |
Proforma amounts |  |  |  |  |  |  |  |
Total revenues (net interest income plus noninterest income) |  |  |  |  | $ 1,163,057,000 |  |  |
Net interest income |  |  |  |  | 799,727,000 |  |  |
Net adjusted income available to the common shareholder |  |  |  |  | $ 240,838,000 |  |  |
EPS - basic | $ / shares |  |  |  |  | $ 3.40 |  |  |
EPS - diluted | $ / shares |  |  |  |  | $ 3.38 |  |  |
CSFL |  |  |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired [Abstract] |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 2,566,450,000 |  |  |  |  |  |
Investment securities |  | 1,193,910,000 |  |  |  |  |  |
Loans held for sale |  | 453,578,000 |  |  |  |  |  |
Loans, net of allowance and mark |  | 12,950,583,000 |  |  |  |  |  |
Premises and equipment |  | 313,435,000 |  |  |  |  |  |
Intangible assets |  | 140,862,000 |  |  |  |  |  |
OREO and repossessed assets |  | 10,009,000 |  |  |  |  |  |
Bank owned life insurance |  | 333,053,000 |  |  |  |  |  |
Deferred tax asset |  | 37,622,000 |  |  |  |  |  |
Other assets |  | 965,386,000 |  |  |  |  |  |
Total assets |  | 18,964,888,000 |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |  |  |
Noninterest-bearing |  | 5,291,443,000 |  |  |  |  |  |
Interest-bearing |  | 10,332,072,000 |  |  |  |  |  |
Total deposits |  | 15,623,515,000 |  |  |  |  |  |
Federal funds purchased and securities sold under agreements to repurchase |  | 401,546,000 |  |  |  |  |  |
Other borrowings |  | 271,499,000 |  |  |  |  |  |
Other liabilities |  | 973,990,000 |  |  |  |  |  |
Total liabilities |  | 17,270,550,000 |  |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed |  | 1,694,338,000 |  |  |  |  |  |
Goodwill |  | 562,370,000 | 562,400,000 |  |  | 562,400,000 |  | 562,400,000
Net assets acquired over liabilities assumed |  | $ 2,256,708,000 |  |  |  |  |  |
Consideration: |  |  |  |  |  |  |  |
Number of shares issued as consideration | shares |  | 37,271,069 |  |  |  |  |  |
Purchase price per share of the Company's common stock | $ / shares |  | $ 60.27 |  |  |  |  |  |
Company common stock issued ($2,246,327) and cash exchanged for fractional shares ($74) |  | $ 2,246,401,000 |  |  |  |  |  |
Stock option conversion |  | 2,900,000 |  |  |  |  |  |
Restricted stock conversion |  | 7,407,000 |  |  |  |  |  |
Value of common stock issued for fractional shares |  | 2,246,327,000 |  |  |  |  |  |
Price per fractional share |  | 74,000 |  |  |  |  |  |
Cash paid for stock options outstanding |  | 2,900,000 |  |  |  |  |  |
Fair value of total consideration transferred |  | 2,256,708,000 |  |  |  |  |  |
Noncash Merger Related Costs |  | 2,900,000 |  |  |  |  |  |
Merger-related charges/costs |  |  | 16,600,000 | 21,600,000 |  | 59,600,000 | 65,900,000 |
Additional information |  |  |  |  |  |  |  |
Reversal of CSFL's existing fair value adjustments |  | 40,700,000 |  |  |  |  |  |
Adjustment to record securities at fair value (premium) |  | 46,200,000 |  |  |  |  |  |
Reclassification of securities held as HTM to AFS |  | 175,700,000 |  |  |  |  |  |
Total mark of the loan portfolio |  | $ 269,100,000 |  |  |  |  |  |
Total mark of the loan portfolio (as a percent) |  | 2.04% |  |  |  |  |  |
Credit mark of the loan portfolio |  | $ 259,700,000 |  |  |  |  |  |
Credit mark of the loan portfolio (as a percent) |  | 1.97% |  |  |  |  |  |
Reversal of CSFL's ending allowance for credit losses |  | $ 158,200,000 |  |  |  |  |  |
Fair value adjustments of allowance for credit losses |  | 62,600,000 |  |  |  |  |  |
MTM adjustment on leased assets |  | 4,000,000.0 |  |  |  |  |  |
Deminimus fixed assets written off |  | $ 1,600,000 |  |  |  |  |  |
Core deposit intangible from a third party valuation (as a percent) |  | 1.28 |  |  |  |  |  |
Core deposit intangible from a third party valuation |  | $ 125,900,000 |  |  |  |  |  |
Existing core deposit intangible from prior transactions that was reversed |  | 84,900,000 |  |  |  |  |  |
Existing goodwill from prior transactions that was reversed |  | 1,200,000,000 |  |  |  |  |  |
Reversal of prior valuation reserves |  | 878,000 |  |  |  |  |  |
New valuation reserves |  | $ 1,700,000 |  |  |  |  |  |
Deferred tax assets related to fair value adjustments with effective tax rate |  | 22.00% |  |  |  |  |  |
Fair value adjustment of bank property held for sale |  | $ 4,400,000 |  |  |  |  |  |
Fair value adjustment of lease receivable |  | 116,000 |  |  |  |  |  |
Fair value adjustment of interest receivable |  | 501,000 |  |  |  |  |  |
Fair value negative adjustment for investment in low income housing |  | 3,300,000 |  |  |  |  |  |
Estimated premium for fixed maturity time deposits |  | 20,200,000 |  |  |  |  |  |
Reversal of existing CSFL fair value adjustments related to time deposit marks from other merger transactions |  | 546,000 |  |  |  |  |  |
Discount on TRUPs from a third party valuation |  | 12,500,000 |  |  |  |  |  |
Reversal of the existing CSFL discount on TRUPs and other debt |  | 5,100,000 |  |  |  |  |  |
Reversal of an existing unfunded commitment reserve at purchase date |  | 7,100,000 |  |  |  |  |  |
Fair value adjustment to increase lease liabilities associated with rental facilities |  | 2,500,000 |  |  |  |  |  |
Fair value adjustments to employee benefit plans |  | 5,200,000 |  |  |  |  |  |
Merger-related charges/costs |  |  | 16,600,000 | 21,600,000 |  | 59,600,000 | 65,900,000 |
CSFL | As Recorded by CSFL |  |  |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired [Abstract] |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 2,566,450,000 |  |  |  |  |  |
Investment securities |  | 1,188,403,000 |  |  |  |  |  |
Loans held for sale |  | 453,578,000 |  |  |  |  |  |
Loans, net of allowance and mark |  | 12,969,091,000 |  |  |  |  |  |
Premises and equipment |  | 308,150,000 |  |  |  |  |  |
Intangible assets |  | 1,294,211,000 |  |  |  |  |  |
OREO and repossessed assets |  | 10,849,000 |  |  |  |  |  |
Bank owned life insurance |  | 333,053,000 |  |  |  |  |  |
Deferred tax asset |  | 54,123,000 |  |  |  |  |  |
Other assets |  | 967,059,000 |  |  |  |  |  |
Total assets |  | 20,144,967,000 |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |  |  |
Noninterest-bearing |  | 5,291,443,000 |  |  |  |  |  |
Interest-bearing |  | 10,312,370,000 |  |  |  |  |  |
Total deposits |  | 15,603,813,000 |  |  |  |  |  |
Federal funds purchased and securities sold under agreements to repurchase |  | 401,546,000 |  |  |  |  |  |
Other borrowings |  | 278,900,000 |  |  |  |  |  |
Other liabilities |  | 977,725,000 |  |  |  |  |  |
Total liabilities |  | 17,261,984,000 |  |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed |  | 2,882,983,000 |  |  |  |  |  |
Net assets acquired over liabilities assumed |  | 2,882,983,000 |  |  |  |  |  |
CSFL | Initial Fair Value Adjustments |  |  |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired [Abstract] |  |  |  |  |  |  |  |
Investment securities |  | 5,507,000 |  |  |  |  |  |
Loans, net of allowance and mark |  | (48,342,000) |  |  |  |  |  |
Premises and equipment |  | 2,392,000 |  |  |  |  |  |
Intangible assets |  | (1,163,349,000) |  |  |  |  |  |
OREO and repossessed assets |  | (791,000) |  |  |  |  |  |
Deferred tax asset |  | (8,681,000) |  |  |  |  |  |
Other assets |  | (604,000) |  |  |  |  |  |
Total assets |  | (1,213,868,000) |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |  |  |
Interest-bearing |  | 19,702,000 |  |  |  |  |  |
Total deposits |  | 19,702,000 |  |  |  |  |  |
Other borrowings |  | (7,401,000) |  |  |  |  |  |
Other liabilities |  | (4,592,000) |  |  |  |  |  |
Total liabilities |  | 7,709,000 |  |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed |  | (1,221,577,000) |  |  |  |  |  |
Goodwill |  | 600,483,000 |  |  |  |  |  |
Net assets acquired over liabilities assumed |  | (621,094,000) |  |  |  |  |  |
CSFL | Subsequent Fair Value Adjustments |  |  |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired [Abstract] |  |  |  |  |  |  |  |
Loans, net of allowance and mark |  | 29,834,000 |  |  |  |  |  |
Premises and equipment |  | 2,893,000 |  |  |  |  |  |
Intangible assets |  | 10,000,000 |  | $ 10,000,000.0 |  |  | $ 10,000,000.0 |
OREO and repossessed assets |  | (49,000) |  |  |  |  |  |
Deferred tax asset |  | (7,820,000) |  |  |  |  |  |
Other assets |  | (1,069,000) |  |  |  |  |  |
Total assets |  | 33,789,000 |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |  |  |
Other liabilities |  | 857,000 |  |  |  |  |  |
Total liabilities |  | 857,000 |  |  |  |  |  |
Net identifiable assets acquired over (under) liabilities assumed |  | 32,932,000 |  |  |  |  |  |
Goodwill |  | (38,113,000) | $ 38,100,000 |  |  | $ 38,100,000 |  | $ 38,100,000
Net assets acquired over liabilities assumed |  | (5,181,000) |  |  |  |  |  |
Additional information |  |  |  |  |  |  |  |
Deferred tax liability |  | 7,800,000 |  |  |  |  |  |
CSFL | Subsequent Fair Value Adjustments |  |  |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |  |  |
Other liabilities |  | $ 857,000 |  |  |  |  |  |
Additional information |  |  |  |  |  |  |  |
Deferred tax assets related to fair value adjustments with effective tax rate |  | 23.78% |  |  |  |  |  |
Duncan-Williams, Inc. |  |  |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract] |  |  |  |  |  |  |  |
Goodwill | $ 15,800,000 |  |  |  |  |  |  |
Consideration: |  |  |  |  |  |  |  |
Fair value of total consideration transferred | 48,300,000 |  |  |  |  |  |  |
Additional premium paid after three years | $ 8,000,000.0 |  |  |  |  |  |  |

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