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Mergers and Acquisitions- CSFL (Details)
 3 Months Ended
Feb. 01, 2021
USD ($)
Jun. 07, 2020
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract]          
Goodwill     $ 1,579,758,000   $ 1,563,942,000
Additional information          
Reversal of CSFL's ending allowance for credit losses     3,374,000 $ 3,223,000  
Proforma amounts          
Total revenues (net interest income plus noninterest income)       374,136,000  
Net interest income       274,214,000  
Net adjusted income available to the common shareholder       $ 58,179,000  
EPS - basic | $ / shares       $ 0.82  
EPS - diluted | $ / shares       $ 0.81  
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   37,239,000      
Other assets   967,097,000      
Total assets   18,966,216,000      
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   1,695,666,000      
Goodwill   561,042,000 561,000,000.0    
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     10,000,000.0 $ 4,100,000  
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   $ 3,200,000      
Fair value adjustment of lease receivable   116,000      
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     10,000,000.0 $ 4,100,000  
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    
OREO and repossessed assets   (49,000)      
Deferred tax asset   (8,203,000)      
Other assets   642,000      
Total assets   35,117,000      
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   34,260,000      
Goodwill   (39,441,000) $ 39,400,000    
Net assets acquired over liabilities assumed   (5,181,000)      
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