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Mergers and Acquisitions - Atlantic Capital (Details)
 12 Months Ended
Mar. 01, 2022
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2022
USD ($)
Mergers and Acquisitions          
Goodwill   $ 1,923,106,000 $ 1,581,085,000 $ 1,563,942,000  
Deposits:          
Goodwill   1,923,106,000 1,581,085,000 1,563,942,000  
Consideration:          
Reversal of CSFL's ending allowance for credit losses   $ 23,446,000 $ 16,899,000 $ 14,602,000  
Deferred tax assets related to fair value adjustments with effective tax rate   21.00% 21.00% 21.00%  
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        
Goodwill 342,021,000       $ 342,900,000
Acquisition costs   $ 18,500,000 $ 1,700,000    
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       $ 342,900,000
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 effective 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)