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Mergers and Acquisitions- CSFL (Details) - USD ($)
 12 Months Ended
Feb. 01, 2021
Jun. 07, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract]            
Goodwill     $ 1,581,085,000 $ 1,563,942,000 $ 1,002,900,000  
Consideration:            
Additional premium paid after three years $ 8,000,000.0          
Additional information            
Reversal of CSFL's ending allowance for credit losses     $ 16,899,000 $ 14,602,000    
Deferred tax assets related to fair value adjustments with effective tax rate     21.00% 21.00% 21.00%  
Proforma amounts            
Total revenues (net interest income plus noninterest income)       $ 1,522,434,000    
Net interest income       1,061,233,000    
Net adjusted income available to the common shareholder       $ 329,827,000    
EPS - basic       $ 4.66    
EPS - diluted       $ 4.64    
As previously recorded by acquiree            
Additional information            
Reversal of CSFL's ending allowance for credit losses         $ 9,775,000  
CSFL            
Assets            
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        
Net assets acquired over liabilities assumed   $ 2,256,708,000        
Consideration:            
Number of shares issued as consideration   37,271,069        
Purchase price per share of the Company's common stock   $ 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     $ 64,400,000 $ 83,000,000.0    
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        
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%        
Deferred tax liability   $ 7,800,000        
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     64,400,000 83,000,000.0    
CSFL | As Recorded by CSFL            
Assets            
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            
Assets            
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            
Assets            
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   (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 $ 562,400,000    
Net assets acquired over liabilities assumed   $ (5,181,000)        
Additional information            
Deferred tax assets related to fair value adjustments with effective tax rate   23.78%