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Parent Company Only Financial Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Investment in unconsolidated subsidiaries:                                
Other assets $ 2,015,441,000       $ 1,473,193,000               $ 2,015,441,000 $ 1,473,193,000    
Total assets 41,970,021,000       38,469,399,000               41,970,021,000 38,469,399,000    
Liabilities and Equity [Abstract]                                
Subordinated debt and other borrowings 424,055,000       423,172,000               424,055,000 423,172,000    
Other Liabilities 386,512,000       377,343,000               386,512,000 377,343,000    
Stockholders' equity 5,519,392,000       5,310,607,000       $ 4,904,611,000       5,519,392,000 5,310,607,000 $ 4,904,611,000 $ 4,355,748,000
Total liabilities and shareholders' equity 41,970,021,000       38,469,399,000               41,970,021,000 38,469,399,000    
Expenses:                                
Interest expense                         244,642,000 98,813,000 199,254,000  
Personnel expense, including stock compensation                         510,175,000 436,006,000 334,483,000  
Income tax expense (benefit)                         136,751,000 124,582,000 59,037,000  
Net income 137,847,000 $ 148,658,000 $ 145,127,000 $ 129,110,000 133,528,000 $ 136,577,000 $ 131,790,000 $ 125,428,000 110,876,000 $ 110,645,000 $ 62,444,000 $ 28,356,000 560,742,000 527,323,000 312,321,000  
Preferred stock dividends                         15,192,000 15,192,000 7,596,000  
Net income available to common shareholders 134,049,000 144,860,000 141,329,000 125,312,000 129,730,000 132,779,000 127,992,000 121,630,000 107,078,000 106,847,000 62,444,000 28,356,000 545,550,000 512,131,000 304,725,000  
CONDENSED STATEMENTS OF CASH FLOWS [Abstract]                                
Net income 137,847,000 $ 148,658,000 $ 145,127,000 129,110,000 133,528,000 $ 136,577,000 $ 131,790,000 125,428,000 110,876,000 $ 110,645,000 $ 62,444,000 28,356,000 560,742,000 527,323,000 312,321,000  
Adjustments to reconcile net income to net cash provided by operating activities:                                  
Depreciation, amortization and accretion                         62,298,000 53,256,000 45,203,000  
Stock-based compensation expense                         39,552,000 24,952,000 18,737,000  
Deferred tax (expense) benefit                         19,740,000 (12,232,000) (58,315,000)  
Income from equity method investment                         (145,466,000) (122,274,000) (83,539,000)  
Dividends received from equity method investment                         63,114,000 69,996,000 53,020,000  
Excess tax benefit from stock compensation                         3,027,000 2,475,000 417,000  
(Increase) decrease in other assets                         (82,893,000) 73,527,000 (157,294,000)  
Increase (decrease) in other liabilities                         (26,620,000) (60,315,000) 69,241,000  
Net cash provided by operating activities                         604,925,000 657,444,000 426,754,000  
Investing activities:                                
Increase in other investments                         (90,967,000) (83,830,000) (70,183,000)  
Net cash used in investing activities                         (6,684,439,000) (3,612,955,000) (3,567,591,000)  
Financing activities:                                
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes                         (5,462,000) (3,790,000) (2,488,000)  
Issuance of preferred stock, net of issuance costs                         0 0 217,126,000  
Repurchase of common stock                         0 0 (50,790,000)  
Common dividends paid                         68,194,000 55,504,000 49,389,000  
Preferred stock dividends paid                         15,192,000 15,192,000 7,596,000  
Net cash provided by financing activities                         3,155,357,000 3,095,601,000 6,575,579,000  
Investment Income, Dividend                         110,800,000 99,800,000 119,100,000  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect                         (2,924,157,000) 140,090,000 3,434,742,000  
Contribution of Property                         134,700,000      
Parent Company                                
Assets [Abstract]                                
Cash and cash equivalents 186,572,000       184,654,000       275,888,000       186,572,000 184,654,000 275,888,000 $ 182,091,000
Investment in unconsolidated subsidiaries:                                
Unconsolidated subsidiaries 3,995,000       3,995,000               3,995,000 3,995,000    
Other investments 56,957,000       156,292,000               56,957,000 156,292,000    
Current income tax receivable 33,870,000       29,609,000               33,870,000 29,609,000    
Other assets 57,980,000       24,930,000               57,980,000 24,930,000    
Total assets 5,978,420,000       5,739,616,000               5,978,420,000 5,739,616,000    
Liabilities and Equity [Abstract]                                
Subordinated debt and other borrowings 424,055,000       423,172,000               424,055,000 423,172,000    
Other Liabilities 34,973,000       5,837,000               34,973,000 5,837,000    
Stockholders' equity 5,519,392,000       5,310,607,000               5,519,392,000 5,310,607,000    
Total liabilities and shareholders' equity 5,978,420,000       5,739,616,000               5,978,420,000 5,739,616,000    
CONDENSED STATEMENTS OF OPERATIONS [Abstract]                                
Income from equity method investment                         33,817,000 33,169,000 22,587,000  
Other income (loss)                         6,478,000 14,945,000 3,861,000  
Expenses:                                
Interest expense                         18,590,000 22,903,000 23,877,000  
Personnel expense, including stock compensation                         39,552,000 24,952,000 18,737,000  
Other expense                         3,025,000 2,697,000 2,905,000  
Income before income taxes and equity in undistributed income of subsidiaries                         90,107,000 97,417,000 100,113,000  
Income tax expense (benefit)                         (8,444,000) (3,088,000) (5,370,000)  
Income before equity in undistributed income of subsidiaries                         98,551,000 100,505,000 105,483,000  
Equity in undistributed income of bank subsidiaries                         461,004,000 424,978,000 205,327,000  
Equity in undistributed income (loss) of nonbank subsidiaries                         1,187,000 1,840,000 1,511,000  
Net income                         560,742,000 527,323,000 312,321,000  
Preferred stock dividends                         15,192,000 15,192,000 7,596,000  
Net income available to common shareholders                         545,550,000 512,131,000 304,725,000  
CONDENSED STATEMENTS OF CASH FLOWS [Abstract]                                
Net income                         560,742,000 527,323,000 312,321,000  
Adjustments to reconcile net income to net cash provided by operating activities:                                  
Depreciation, amortization and accretion                         882,000 1,886,000 1,122,000  
Stock-based compensation expense                         39,552,000 24,952,000 18,737,000  
Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable                         28,281,000 0 (2,467,000)  
Deferred tax (expense) benefit                         1,760,000 2,850,000 3,876,000  
Income from equity method investment                         (33,817,000) (33,169,000) (22,587,000)  
Dividends received from equity method investment                         10,365,000 12,214,000 9,251,000  
Excess tax benefit from stock compensation                         (3,027,000) (2,475,000) (417,000)  
Gain on other investments, net                         (2,563,000) (10,223,000) (195,000)  
(Increase) decrease in other assets                         (32,609,000) 19,478,000 (39,981,000)  
Increase (decrease) in other liabilities                         3,881,000 2,032,000 (764,000)  
Equity in undistributed (income) loss of bank subsidiaries                         (461,004,000) (424,978,000) (205,327,000)  
Equity in undistributed (income) loss of nonbank subsidiaries                         (1,187,000) (1,840,000) (1,511,000)  
Net cash provided by operating activities                         111,256,000 118,050,000 72,058,000  
Investing activities:                                
Investment in consolidated banking subsidiaries                         0 0 0  
Increase in other investments                         (15,776,000) (11,668,000) (2,454,000)  
Net cash used in investing activities                         (15,776,000) (11,668,000) (2,454,000)  
Financing activities:                                
Proceeds from (Repayments of) Debt                         0 0 (93,000)  
Repayment of other borrowings                         0 (120,000,000) (80,000,000)  
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes                         (5,462,000) (3,790,000) (2,488,000)  
Exercise of common stock options, net of shares surrendered for taxes                         (4,714,000) (3,130,000) (2,577,000)  
Issuance of preferred stock, net of issuance costs                         0 0 217,126,000  
Repurchase of common stock                         0 0 (50,790,000)  
Common dividends paid                         (68,194,000) (55,504,000) (49,389,000)  
Preferred stock dividends paid                         (15,192,000) (15,192,000) (7,596,000)  
Net cash provided by financing activities                         (93,562,000) (197,616,000) 24,193,000  
Cash and cash equivalents, beginning of year       $ 184,654,000       $ 275,888,000       $ 182,091,000 184,654,000 275,888,000 182,091,000  
Cash and cash equivalents, end of year 186,572,000       184,654,000       $ 275,888,000       186,572,000 184,654,000 275,888,000  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect                         1,918,000 (91,234,000) 93,797,000  
Banking                                
Assets [Abstract]                                
Investments in consolidated subsidiaries 5,626,844,000       5,329,003,000               5,626,844,000 5,329,003,000    
CONDENSED STATEMENTS OF OPERATIONS [Abstract]                                
Income from bank subsidiaries                         110,834,000 99,766,000 119,065,000  
Nonbank subsidiaries                                
Assets [Abstract]                                
Investments in consolidated subsidiaries $ 12,202,000       $ 11,133,000               12,202,000 11,133,000    
CONDENSED STATEMENTS OF OPERATIONS [Abstract]                                
Income from bank subsidiaries                         $ 145,000 $ 89,000 $ 119,000