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Summary of Significant Accounting Policies (Details)
3 Months Ended 12 Months Ended
Jan. 01, 2022
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2021
USD ($)
market
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
Jun. 30, 2021
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
$ / shares
Mar. 31, 2019
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
Dec. 31, 2021
USD ($)
market
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
shares
Accounting Policies [Abstract]                                      
Number of Markets in Which Entity Operates | market     15                         15      
Goodwill [Roll Forward]                                      
Balance at December 31, 2020 $ 1,819,811,000         $ 1,819,811,000                   $ 1,819,811,000      
Balance at December 31, 2021     $ 1,819,811,000       $ 1,819,811,000                 1,819,811,000 $ 1,819,811,000    
Finite-lived Intangible Assets [Roll Forward]                                      
Balance at December 31, 2020 33,819,000         42,336,000                   42,336,000      
Amortization                               (8,518,000) (9,793,000) $ (9,908,000)  
Balance at December 31, 2021     33,819,000       42,336,000                 33,819,000 42,336,000    
Balance at December 31, 2020 1,853,630,000         1,862,147,000                   1,862,147,000      
Amortization                               (8,518,000)      
Balance at December 31, 2021     1,853,630,000       1,862,147,000                 1,853,630,000 1,862,147,000    
Finite-Lived Intangible Assets, Net [Abstract]                                      
Finite-Lived Intangible Assets, Gross     108,665,000       108,665,000                 108,665,000 108,665,000    
Accumulated amortization     (74,846,000)       (66,329,000)                 (74,846,000) (66,329,000)    
Net book value     33,819,000       42,336,000                 $ 33,819,000 42,336,000    
Cash Equivalents and Cash Flows [Abstract]                                      
Cash equivalents maturity period                               90 days      
Cash Payments [Abstract]                                      
Interest                               $ 110,119,000 215,888,000 287,272,000  
Income taxes paid                               108,304,000 110,798,000 86,960,000  
Noncash Transactions [Abstract]                                      
Loans charged-off to the allowance for credit losses                               (54,996,000) (49,333,000) (28,467,000)  
Real Estate Owned, Transfer to Real Estate Owned                               1,098,000 3,436,000 17,937,000  
Loans foreclosed upon with repossessions transferred to other repossessed assets                               0 25,000 93,000  
Other Real Estate Sales Financed                               0 0 871,000  
Fixed assets transferred to other real estate                               0 0 8,182,000  
Available-for-sale securities transferred to Held-to-Maturity 1,100,000,000                 $ 873,600,000         $ 179,800,000 0 873,613,000 0  
Unrealized after tax gain (loss) on available-for-sale securities transferred to the held-to-maturity portfolio $ 1,500,000                 (69,000,000)         $ 2,200,000        
Right of Use Assets Recognized                               17,642,000 15,820,000 90,927,000 [1]  
Loans [Abstract]                                      
Loans and Leases Receivable, Deferred Income     $ 34,300,000       53,200,000                 $ 34,300,000 53,200,000    
Percentage of loan portfolio assigned specific risk rating     76.60%                         76.60%      
Risk rated loans     $ 1,000,000                         $ 1,000,000      
Other Assets [Abstract]                                      
Premises and equipment, net     $ 288,182,000       290,001,000                 288,182,000 290,001,000    
Amortization                               $ 1,600,000 2,300,000 2,700,000  
Number of trusts investment     12                         12      
Value of investments with trust companies     $ 4,000,000.0                         $ 4,000,000.0      
Cash surrender value of life insurance     761,900,000       743,900,000                 761,900,000 743,900,000    
Bank-owned life insurance                               18,942,000 18,784,000 17,361,000  
investments are included in CRA investments     189,600,000       143,200,000                 189,600,000 143,200,000    
Amortization Method Qualified Affordable Housing Project Investments     116,200,000       90,200,000                 116,200,000 90,200,000    
Variable Interest Entity [Line Items]                                      
Federal Reserve Bank and Federal Home Loan Bank (FHLB) stock     67,800,000       80,400,000                 67,800,000 80,400,000    
Other Investments     101,000,000       47,800,000                 101,000,000 47,800,000    
Gain (loss) due to change in fair value of investments                               23,109,000 1,071,000 2,789,000  
Other Real Estate Owned [Abstract]                                      
Other real estate owned     8,500,000       12,400,000                 8,500,000 12,400,000    
Valuation allowance related to other real estate owned     $ 0       $ 0                 0 0    
Foreclosed real estate expense                                 8,600,000 4,200,000  
Foreclosed Real Estate Benefit                               (712,300)      
Income Tax Contingency [Line Items]                                      
Income Tax Examination, Penalties and Interest Expense                               $ 0 $ 571,000 $ 0  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                                      
Stock options outstanding (in shares) | shares     56,147       101,769       119,274         56,147 101,769 119,274 178,591
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | shares                               458,808 277,896 399,600  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares                               32,684 394,593 160,492  
Basic earnings per share calculation [Abstract]                                      
Numerator - Net income (loss) available to common stockholders     $ 129,730,000 $ 132,779,000 $ 127,992,000 $ 121,630,000 $ 107,078,000 $ 106,847,000 $ 62,444,000 $ 28,356,000 $ 96,079,000 $ 110,521,000 $ 100,321,000 $ 93,960,000   $ 512,131,000 $ 304,725,000 $ 400,881,000  
Denominator - Weighted average common shares outstanding (in shares) | shares                               75,468,339 75,376,489 76,364,303  
Basic net income per common share (in dollars per share) | $ / shares     $ 1.72 $ 1.76 $ 1.70 $ 1.61 $ 1.42 $ 1.42 $ 0.83 $ 0.37 $ 1.26 $ 1.45 $ 1.31 $ 1.22   $ 6.79 $ 4.04 $ 5.25  
Diluted net income per share calculation [Abstract]                                      
Numerator - Net income (loss) available to common stockholders     $ 129,730,000 $ 132,779,000 $ 127,992,000 $ 121,630,000 $ 107,078,000 $ 106,847,000 $ 62,444,000 $ 28,356,000 $ 96,079,000 $ 110,521,000 $ 100,321,000 $ 93,960,000   $ 512,131,000 $ 304,725,000 $ 400,881,000  
Denominator - Weighted average common shares outstanding (in shares) | shares                               75,468,339 75,376,489 76,364,303  
Dilutive shares (in shares) | shares                               458,808 277,896 399,600  
Weighted average diluted common shares outstanding (in shares) | shares                               75,927,147 75,654,385 76,763,903  
Diluted net income per common share (in dollars per share) | $ / shares     $ 1.71 $ 1.75 $ 1.69 $ 1.61 $ 1.42 $ 1.42 $ 0.83 $ 0.37 $ 1.26 $ 1.44 $ 1.31 $ 1.22   $ 6.75 $ 4.03 $ 5.22  
New Accounting Pronouncements or Change in Accounting Principle                                      
Right of Use Assets Recognized                               $ 17,642,000 $ 15,820,000 $ 90,927,000 [1]  
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                               30 years      
Computer Software, Intangible Asset                                      
Other Assets [Abstract]                                      
Premises and equipment, net     $ 5,100,000       $ 4,500,000                 $ 5,100,000 4,500,000    
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                               7 years      
Bankers Healthcare Group, LLC                                      
Schedule of Equity Method Investments [Line Items]                                      
Equity Method Investment, Ownership Percentage     49.00%                         49.00%      
Finite-lived Intangible Assets [Roll Forward]                                      
Amortization                               $ (752,000) $ (1,200,000) $ (1,900,000)  
Internal Revenue Service (IRS) | Minimum                                      
Income Tax Contingency [Line Items]                                      
Tax year open to audit under the statute of limitation                               2018      
Internal Revenue Service (IRS) | Maximum                                      
Income Tax Contingency [Line Items]                                      
Tax year open to audit under the statute of limitation                               2021      
Employee Stock Option                                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                                      
Stock options outstanding (in shares) | shares     56,147                         56,147      
Accounting Standards Update 2016-02                                      
Noncash Transactions [Abstract]                                      
Right of Use Assets Recognized   $ 79,900,000                                  
New Accounting Pronouncements or Change in Accounting Principle                                      
Right of Use Assets Recognized   $ 79,900,000                                  
[1] Includes $79.9 million recognized upon initial adoption of ASU 2016-02 on January 1, 2019.