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Summary of Significant Accounting Policies (Details) - USD ($)
 12 Months Ended
Mar. 01, 2022
Mar. 01, 2016
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2021
Dec. 31, 2017
Nature of Business [Abstract]                  
Gain on remeasurement of previously held noncontrolling interest     $ 0 $ 0 $ 5,500,000        
Goodwill [Roll Forward]                  
Balance at December 31, 2020     1,846,973,000            
Goodwill, Acquired During Period     2,287,000            
Goodwill, amortization     0            
Balance at December 31, 2021     1,849,260,000 1,846,973,000          
Finite-lived Intangible Assets [Roll Forward]                  
Balance at December 31, 2020     27,465,000            
Acquisitions     212,000            
Amortization     (6,254,000) (7,090,000) (7,810,000)        
Balance at December 31, 2021     21,423,000 27,465,000          
Balance at December 31, 2020     1,874,438,000            
Acquisitions     2,499,000            
Amortization     (6,254,000)            
Balance at December 31, 2021     1,870,683,000 1,874,438,000          
Finite-Lived Intangible Assets, Net [Abstract]                  
Finite-Lived Intangible Assets, Gross     117,423,000 117,211,000          
Accumulated amortization     (96,000,000) (89,746,000)          
Net book value     $ 21,423,000 27,465,000          
Cash Equivalents and Cash Flows [Abstract]                  
Cash equivalents maturity period     90 days            
Cash Payments [Abstract]                  
Interest     $ 1,342,635,000 1,042,542,000 236,463,000        
Income taxes paid     30,763,000 99,890,000 128,850,000        
Noncash Transactions [Abstract]                  
Loans charged-off to the allowance for credit losses     (99,205,000) (76,725,000) (54,176,000)        
Real Estate Owned, Transfer to Real Estate Owned     1,780,000 2,016,000 230,000        
Loans foreclosed upon with repossessions transferred to other repossessed assets     197,000 561,000 0        
Available-for-sale securities transferred to Held-to-Maturity     0 0 1,059,737,000 $ 873,600,000 $ 179,800,000    
Right of Use Assets Recognized     26,428,000 205,776,000 42,413,000        
Loans [Abstract]                  
Financing Receivable, Unamortized Loan Cost (Fee)     $ 3,700,000 4,800,000          
Percentage of loan portfolio assigned specific risk rating     80.30%            
Risk rated loans     $ 1,500,000            
Other Assets [Abstract]                  
Premises and equipment, net     311,277,000 256,877,000          
Amortization     $ 4,600,000 3,300,000 2,800,000        
Number of trusts investment     12            
Value of investments with trust companies     $ 4,000,000.0            
Cash surrender value of life insurance     1,000,000,000.0 995,200,000          
Bank-owned life insurance     39,700,000 15,797,000 21,033,000        
investments are included in CRA investments     324,200,000 260,500,000          
Gain (loss) due to change in fair value of investments     17,112,000 8,732,000 10,605,000        
Other Investments [Abstract]                  
Federal Reserve Bank and Federal Home Loan Bank (FHLB) stock     111,900,000 117,000,000.0          
Other Investments     176,600,000 157,100,000          
Gain (loss) due to change in fair value of investments     17,112,000 8,732,000 10,605,000        
Other Real Estate Owned [Abstract]                  
Other real estate owned     1,300,000 3,900,000          
Valuation allowance related to other real estate owned     0 0          
Foreclosed real estate expense     220,000 315,000          
Foreclosed Real Estate Benefit         280,000        
Income Tax Contingency [Line Items]                  
Income Tax Examination, Penalties and Interest Expense     $ 41,000 $ 80,000 $ 264,000        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Stock options outstanding (in shares)       0 40,188     56,147  
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements     670,404 631,173 398,461        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     107,548 484,871 263,573        
Basic earnings per share calculation [Abstract]                  
Numerator - Net income (loss) available to common stockholders     $ 459,864,000 $ 546,960,000 $ 545,550,000        
Denominator - Weighted average common shares outstanding (in shares)     76,460,926 76,016,370 75,735,404        
Basic net income per common share (in dollars per share)     $ 6.01 $ 7.20 $ 7.20        
Diluted net income per share calculation [Abstract]                  
Numerator - Net income (loss) available to common stockholders     $ 459,864,000 $ 546,960,000 $ 545,550,000        
Denominator - Weighted average common shares outstanding (in shares)     76,460,926 76,016,370 75,735,404        
Dilutive shares (in shares)     670,404 631,173 398,461        
Weighted average diluted common shares outstanding (in shares)     77,131,330 76,647,543 76,133,865        
Diluted net income per common share (in dollars per share)     $ 5.96 $ 7.14 $ 7.17        
New Accounting Pronouncements or Change in Accounting Principle                  
Right of Use Assets Recognized     $ 26,428,000 $ 205,776,000 $ 42,413,000        
Cumulative effect of change in accounting principle [1]       (35,002,000)          
BOLI Restructure Receivable     $ 0 $ 141,547,000 0        
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration]     Other assets Other assets          
Schedule of Equity Method Investments [Line Items]                  
Gain on remeasurement of previously held noncontrolling interest     $ 0 $ 0 5,500,000        
Securities Purchased under Agreements to Resell     66,449,000 558,009,000          
Gain (Loss) on Contract Termination     27,600,000            
Individually Evaluated for Impairment     171,868,000 145,095,000          
Securities Purchased under Agreements to Resell, Decrease     500,000,000            
Financing Receivable, Individually Evaluated for Credit Loss [Abstract]                  
Loans Individually Evaluated General Threshhold     1,000,000            
Alternative Investments                  
Other Assets [Abstract]                  
Gain (loss) due to change in fair value of investments     3,200,000 3,100,000 10,600,000        
Other Investments [Abstract]                  
Gain (loss) due to change in fair value of investments     $ 3,200,000 3,100,000 10,600,000        
Premises and Equipment | Minimum                  
Premises and Equipment and Leaseholds [Abstract]                  
Premises and equipment, useful life     3 years            
Premises and Equipment | Maximum                  
Premises and Equipment and Leaseholds [Abstract]                  
Premises and equipment, useful life     40 years            
Computer Software, Intangible Asset                  
Other Assets [Abstract]                  
Premises and equipment, net     $ 10,000,000.0 10,800,000          
Computer Software, Intangible Asset | Minimum                  
Premises and Equipment and Leaseholds [Abstract]                  
Premises and equipment, useful life     3 years            
Computer Software, Intangible Asset | Maximum                  
Premises and Equipment and Leaseholds [Abstract]                  
Premises and equipment, useful life     5 years            
Bankers Healthcare Group, LLC                  
Nature of Business [Abstract]                  
Equity Method Investment, Ownership Percentage     49.00%            
Cash paid to redeem common stock   $ 74,100,000              
Finite-lived Intangible Assets [Roll Forward]                  
Amortization     $ (237,000) $ (349,000) (512,000)        
Schedule of Equity Method Investments [Line Items]                  
Equity Method Investment, Ownership Percentage     49.00%            
Cash paid to redeem common stock   $ 74,100,000              
JB&B Capital | JB&B Capital                  
Nature of Business [Abstract]                  
Equity Method Investment, Ownership Percentage 80.00%               20.00%
Cash paid to redeem common stock $ 32,000,000                
Loans, net of allowance for loan losses 12,900,000                
Borrowings 29,500,000                
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value $ 8,000,000                
Gain on remeasurement of previously held noncontrolling interest         5,500,000        
Schedule of Equity Method Investments [Line Items]                  
Equity Method Investment, Ownership Percentage 80.00%               20.00%
Cash paid to redeem common stock $ 32,000,000                
Loans, net of allowance for loan losses 12,900,000                
Borrowings 29,500,000                
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value 8,000,000                
Gain on remeasurement of previously held noncontrolling interest         $ 5,500,000        
Fidus Capital Partners | Fidus Capital Partners                  
Nature of Business [Abstract]                  
Cash paid to redeem common stock 2,500,000                
Schedule of Equity Method Investments [Line Items]                  
Cash paid to redeem common stock $ 2,500,000                
Internal Revenue Service (IRS) | Minimum                  
Income Tax Contingency [Line Items]                  
Tax year open to audit under the statute of limitation     2021            
Internal Revenue Service (IRS) | Maximum                  
Income Tax Contingency [Line Items]                  
Tax year open to audit under the statute of limitation     2024            
Employee Stock Option                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Stock options outstanding (in shares)     0            
[1] Represents the impact of Banker's Healthcare Group's adoption of ASU 2016-13. See Note 2. Equity Method Investment.