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Summary of Significant Accounting Policies (Details)
 3 Months Ended 12 Months Ended
Mar. 01, 2022
USD ($)
Mar. 01, 2016
USD ($)
Dec. 31, 2023
USD ($)
market
$ / shares
shares
Sep. 30, 2023
USD ($)
$ / shares
Jun. 30, 2023
USD ($)
$ / shares
Mar. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
Jun. 30, 2022
USD ($)
$ / shares
Mar. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
Jun. 30, 2021
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
market
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
Accounting Policies [Abstract]                                        
Number of Markets in Which Entity Operates | market     17                       17          
Schedule of Equity Method Investments [Line Items]                                        
Gain on remeasurement of previously held noncontrolling interest                             $ 0 $ 5,500,000 $ 0      
Goodwill [Roll Forward]                                        
Balance at December 31, 2020           $ 1,846,973,000                 1,846,973,000          
Goodwill, Acquired During Period                             0          
Balance at December 31, 2021     $ 1,846,973,000       $ 1,846,973,000               1,846,973,000 1,846,973,000        
Finite-lived Intangible Assets [Roll Forward]                                        
Balance at December 31, 2020           34,555,000                 34,555,000          
Acquisitions                             0          
Amortization                             (7,090,000) (7,810,000) (8,518,000)      
Balance at December 31, 2021     27,465,000       34,555,000               27,465,000 34,555,000        
Balance at December 31, 2020           1,881,528,000                 1,881,528,000          
Acquisitions                             0          
Amortization                             (7,090,000)          
Balance at December 31, 2021     1,874,438,000       1,881,528,000               1,874,438,000 1,881,528,000        
Finite-Lived Intangible Assets, Net [Abstract]                                        
Finite-Lived Intangible Assets, Gross     117,211,000       117,211,000               117,211,000 117,211,000        
Accumulated amortization     (89,746,000)       (82,656,000)               (89,746,000) (82,656,000)        
Net book value     27,465,000       34,555,000               $ 27,465,000 34,555,000        
Cash Equivalents and Cash Flows [Abstract]                                        
Cash equivalents maturity period                             90 days          
Cash Payments [Abstract]                                        
Interest                             $ 1,042,542,000 236,463,000 110,119,000      
Income taxes paid                             99,890,000 128,850,000 108,304,000      
Noncash Transactions [Abstract]                                        
Loans charged-off to the allowance for credit losses                             (76,725,000) (54,176,000) (54,996,000)      
Real Estate Owned, Transfer to Real Estate Owned                             2,016,000 230,000 1,098,000      
Loans foreclosed upon with repossessions transferred to other repossessed assets                             561,000 0 0      
Available-for-sale securities transferred to Held-to-Maturity                             0 1,059,737,000 0 $ 873,600,000 $ 179,800,000  
Right of Use Assets Recognized                             205,776,000 42,413,000 17,642,000      
Loans [Abstract]                                        
Loans and Leases Receivable, Deferred Income     $ 4,800,000       26,100,000               $ 4,800,000 26,100,000        
Percentage of loan portfolio assigned specific risk rating     79.20%                       79.20%          
Risk rated loans     $ 1,500,000                       $ 1,500,000          
Other Assets [Abstract]                                        
Premises and equipment, net     $ 256,877,000       327,885,000               256,877,000 327,885,000        
Amortization                             $ 3,300,000 2,800,000 1,600,000      
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     995,200,000       881,900,000               995,200,000 881,900,000        
Bank-owned life insurance                             15,797,000 21,033,000 18,942,000      
investments are included in CRA investments     260,500,000       228,400,000               260,500,000 228,400,000        
Amortization Method Qualified Affordable Housing Project Investments     162,100,000       138,000,000               162,100,000 138,000,000        
Gain (loss) due to change in fair value of investments                             8,732,000 10,605,000 23,109,000      
Other Investments [Abstract]                                        
Federal Reserve Bank and Federal Home Loan Bank (FHLB) stock     117,000,000       80,200,000               117,000,000 80,200,000        
Other Investments     157,100,000       131,000,000               157,100,000 131,000,000        
Gain (loss) due to change in fair value of investments                             8,732,000 10,605,000 23,109,000      
Other Real Estate Owned [Abstract]                                        
Other real estate owned     3,900,000       8,000,000               3,900,000 8,000,000        
Valuation allowance related to other real estate owned     $ 0       $ 0               0 0        
Foreclosed real estate expense                             315,000 280,000        
Foreclosed Real Estate Benefit                                 (712,000)      
Income Tax Contingency [Line Items]                                        
Income Tax Examination, Penalties and Interest Expense                             $ 80,000 $ 264,000 $ 0      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                                        
Stock options outstanding (in shares) | shares     0       40,188       56,147       0 40,188 56,147 101,769    
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | shares                             631,173 398,461 458,808      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares                             484,871 263,573 32,684      
Basic earnings per share calculation [Abstract]                                        
Numerator - Net income (loss) available to common stockholders     $ 91,181,000 $ 128,805,000 $ 193,501,000 $ 133,473,000 $ 134,049,000 $ 144,860,000 $ 141,329,000 $ 125,312,000 $ 129,730,000 $ 132,779,000 $ 127,992,000 $ 121,630,000 $ 546,960,000 $ 545,550,000 $ 512,131,000      
Denominator - Weighted average common shares outstanding (in shares) | shares                             76,016,370 75,735,404 75,468,339      
Basic net income per common share (in dollars per share) | $ / shares     $ 1.20 $ 1.69 $ 2.55 $ 1.76 $ 1.77 $ 1.91 $ 1.87 $ 1.66 $ 1.72 $ 1.76 $ 1.70 $ 1.61 $ 7.20 $ 7.20 $ 6.79      
Diluted net income per share calculation [Abstract]                                        
Numerator - Net income (loss) available to common stockholders     $ 91,181,000 $ 128,805,000 $ 193,501,000 $ 133,473,000 $ 134,049,000 $ 144,860,000 $ 141,329,000 $ 125,312,000 $ 129,730,000 $ 132,779,000 $ 127,992,000 $ 121,630,000 $ 546,960,000 $ 545,550,000 $ 512,131,000      
Denominator - Weighted average common shares outstanding (in shares) | shares                             76,016,370 75,735,404 75,468,339      
Dilutive shares (in shares) | shares                             631,173 398,461 458,808      
Weighted average diluted common shares outstanding (in shares) | shares                             76,647,543 76,133,865 75,927,147      
Diluted net income per common share (in dollars per share) | $ / shares     $ 1.19 $ 1.69 $ 2.54 $ 1.76 $ 1.76 $ 1.91 $ 1.86 $ 1.65 $ 1.71 $ 1.75 $ 1.69 $ 1.61 $ 7.14 $ 7.17 $ 6.75      
New Accounting Pronouncements or Change in Accounting Principle                                        
Right of Use Assets Recognized                             $ 205,776,000 $ 42,413,000 $ 17,642,000      
BOLI Restructure Receivable     $ 141,547,000       $ 0       $ 0       141,547,000 0 0      
Alternative Investments                                        
Other Assets [Abstract]                                        
Gain (loss) due to change in fair value of investments                             3,100,000 10,600,000 23,100,000      
Other Investments [Abstract]                                        
Gain (loss) due to change in fair value of investments                             $ 3,100,000 10,600,000 23,100,000      
Premises and Equipment | Minimum                                        
Premises and Equipment and Leaseholds [Abstract]                                        
Premises and equipment, useful life     3 years                       3 years          
Premises and Equipment | Maximum                                        
Premises and Equipment and Leaseholds [Abstract]                                        
Premises and equipment, useful life     35 years                       35 years          
Computer Software, Intangible Asset                                        
Other Assets [Abstract]                                        
Premises and equipment, net     $ 10,800,000       $ 6,600,000               $ 10,800,000 6,600,000        
Computer Software, Intangible Asset | Minimum                                        
Premises and Equipment and Leaseholds [Abstract]                                        
Premises and equipment, useful life     3 years                       3 years          
Computer Software, Intangible Asset | Maximum                                        
Premises and Equipment and Leaseholds [Abstract]                                        
Premises and equipment, useful life     7 years                       7 years          
Bankers Healthcare Group, LLC                                        
Schedule of Equity Method Investments [Line Items]                                        
Equity Method Investment, Ownership Percentage     49.00%                       49.00%          
Cash paid to redeem common stock   $ 74,100,000                                    
Finite-lived Intangible Assets [Roll Forward]                                        
Amortization                             $ (349,000) (512,000) $ (752,000)      
JB&B Capital | JB&B Capital                                        
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        
Internal Revenue Service (IRS) | Minimum                                        
Income Tax Contingency [Line Items]                                        
Tax year open to audit under the statute of limitation                             2020          
Internal Revenue Service (IRS) | Maximum                                        
Income Tax Contingency [Line Items]                                        
Tax year open to audit under the statute of limitation                             2023          
Employee Stock Option                                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                                        
Stock options outstanding (in shares) | shares     0                       0