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Mergers and Acquisitions- CSFL (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jun. 07, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract]            
Goodwill     $ 1,563,942,000 $ 1,002,900,000 $ 1,002,900,000  
Additional information            
Reversal of CSFL's ending allowance for credit losses     $ 14,602,000      
Deferred tax assets related to fair value adjustments with effective tax rate     21.00% 21.00% 21.00% 35.00%
Provisional income tax expense     $ 26,600,000      
Proforma amounts            
Total revenues (net interest income plus noninterest income), Pro Forma     1,508,215,000 $ 1,368,452,000    
Net interest income     1,047,014,000 1,058,827,000    
Net adjusted income available to the common shareholder     $ 385,390,000 $ 412,515,000    
EPS - basic     $ 5.44 $ 5.85    
EPS - diluted     $ 5.42 $ 5.81    
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 $ 330,300,000        
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          
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 $ 2,260,000,000        
Noncash Merger Related Costs 2,900,000          
Merger-related charges/costs     $ 83,000,000.0 $ 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 1,200,000,000          
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     83,000,000.0 $ 0    
Provision for loan losses     3,800,000      
Provisional income tax expense     $ 119,100,000      
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          
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)          
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%          
CSFL | Subsequent Fair Value Adjustments            
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposit Liabilities [Abstract]            
Other liabilities $ 857,000