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Parent Company Only Financial Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investment in unconsolidated subsidiaries:                                
Other assets $ 1,473,193,000       $ 1,520,757,000               $ 1,473,193,000 $ 1,520,757,000    
Total assets 38,469,399,000       34,932,860,000               38,469,399,000 34,932,860,000    
Liabilities and Equity [Abstract]                                
Subordinated debt and other borrowings 423,172,000       670,575,000               423,172,000 670,575,000    
Other Liabilities 377,343,000       411,074,000               377,343,000 411,074,000    
Stockholders' equity 5,310,607,000       4,904,611,000       $ 4,355,748,000       5,310,607,000 4,904,611,000 $ 4,355,748,000 $ 3,965,940,000
Total liabilities and stockholders' equity 38,469,399,000       34,932,860,000               38,469,399,000 34,932,860,000    
Expenses:                                
Interest expense                         98,813,000 199,254,000 301,794,000  
Personnel expense, including stock compensation                         436,006,000 334,483,000 313,359,000  
Income tax expense (benefit)                         124,582,000 59,037,000 96,656,000  
Net income 133,528,000 $ 136,577,000 $ 131,790,000 $ 125,428,000 110,876,000 $ 110,645,000 $ 62,444,000 $ 28,356,000         527,323,000 312,321,000 400,881,000  
Preferred stock dividends                         15,192,000 7,596,000 0  
Net income available to common shareholders 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  
CONDENSED STATEMENTS OF CASH FLOWS [Abstract]                                
Net income 133,528,000 $ 136,577,000 $ 131,790,000 125,428,000 110,876,000 $ 110,645,000 $ 62,444,000 28,356,000         527,323,000 312,321,000 400,881,000  
Adjustments to reconcile net income to net cash provided by operating activities:                                  
Depreciation, amortization and accretion                         53,256,000 45,203,000 8,342,000  
Stock-based compensation expense                         24,952,000 18,737,000 21,226,000  
Deferred tax (expense) benefit                         (12,232,000) (58,315,000) 14,696,000  
Income from equity method investment                         (122,274,000) (83,539,000) (90,111,000)  
Dividends received from equity method investment                         69,996,000 53,020,000 51,312,000  
Excess tax benefit from stock compensation                         (2,475,000) (417,000) (1,011,000)  
(Increase) decrease in other assets                         73,527,000 (157,294,000) (57,499,000)  
Increase (decrease) in other liabilities                         (60,315,000) 69,241,000 79,264,000  
Net cash provided by operating activities                         657,444,000 426,754,000 431,499,000  
Investing activities:                                
Increase in other investments                         (83,830,000) (70,183,000) (53,137,000)  
Net cash used in investing activities                         (3,612,955,000) (3,567,591,000) (2,616,272,000)  
Financing activities:                                
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes                         (3,790,000) (2,488,000) 0  
Issuance of preferred stock, net of issuance costs                         0 217,126,000 0  
Repurchase of common stock                         0 (50,790,000) (61,416,000)  
Common dividends paid                         55,504,000 49,389,000 49,828,000  
Preferred stock dividends paid                         15,192,000 7,596,000 0  
Net cash provided by financing activities                         3,095,601,000 6,575,579,000 1,989,788,000  
Investment Income, Dividend                         99,800,000 119,100,000 114,000,000  
Parent Company                                
Assets [Abstract]                                
Cash and cash equivalents 184,654,000       275,888,000       182,091,000       184,654,000 275,888,000 182,091,000 $ 94,043,000
Investment in unconsolidated subsidiaries:                                
Unconsolidated subsidiaries 3,995,000       3,995,000               3,995,000 3,995,000    
Other investments 156,292,000       113,445,000               156,292,000 113,445,000    
Current income tax receivable 29,609,000       51,621,000               29,609,000 51,621,000    
Other assets 24,930,000       25,747,000               24,930,000 25,747,000    
Total assets 5,739,616,000       5,452,178,000               5,739,616,000 5,452,178,000    
Liabilities and Equity [Abstract]                                
Subordinated debt and other borrowings 423,172,000       541,286,000               423,172,000 541,286,000    
Other Liabilities 5,837,000       6,281,000               5,837,000 6,281,000    
Stockholders' equity 5,310,607,000       4,904,611,000               5,310,607,000 4,904,611,000    
Total liabilities and stockholders' equity 5,739,616,000       5,452,178,000               5,739,616,000 5,452,178,000    
CONDENSED STATEMENTS OF OPERATIONS [Abstract]                                
Income from equity method investment                         33,169,000 22,587,000 24,298,000  
Other income (loss)                         14,945,000 3,861,000 3,485,000  
Expenses:                                
Interest expense                         22,903,000 23,877,000 18,425,000  
Personnel expense, including stock compensation                         24,952,000 18,737,000 21,226,000  
Other expense                         2,697,000 2,905,000 1,496,000  
Income before income taxes and equity in undistributed income of subsidiaries                         97,417,000 100,113,000 100,796,000  
Income tax expense (benefit)                         (3,088,000) (5,370,000) (4,457,000)  
Income before equity in undistributed income of subsidiaries                         100,505,000 105,483,000 105,253,000  
Equity in undistributed income of bank subsidiaries                         424,978,000 205,327,000 294,354,000  
Equity in undistributed income (loss) of nonbank subsidiaries                         1,840,000 1,511,000 1,274,000  
Net income                         527,323,000 312,321,000 400,881,000  
Preferred stock dividends                         15,192,000 7,596,000 0  
Net income available to common shareholders                         512,131,000 304,725,000 400,881,000  
CONDENSED STATEMENTS OF CASH FLOWS [Abstract]                                
Net income                         527,323,000 312,321,000 400,881,000  
Adjustments to reconcile net income to net cash provided by operating activities:                                  
Depreciation, amortization and accretion                         1,886,000 1,122,000 (3,094,000)  
Stock-based compensation expense                         24,952,000 18,737,000 21,226,000  
Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable                         0 (2,467,000) 2,467,000  
Deferred tax (expense) benefit                         2,850,000 3,876,000 (2,857,000)  
Income from equity method investment                         (33,169,000) (22,587,000) (24,298,000)  
Dividends received from equity method investment                         12,214,000 9,251,000 8,953,000  
Excess tax benefit from stock compensation                         (2,475,000) (417,000) (1,011,000)  
Gain on other investments, net                         (10,223,000) (195,000) (1,057,000)  
(Increase) decrease in other assets                         19,478,000 (39,981,000) 7,295,000  
Increase (decrease) in other liabilities                         2,032,000 (764,000) 5,322,000  
Equity in undistributed (income) loss of bank subsidiaries                         (424,978,000) (205,327,000) (294,354,000)  
Equity in undistributed (income) loss of nonbank subsidiaries                         (1,840,000) (1,511,000) (1,274,000)  
Net cash provided by operating activities                         118,050,000 72,058,000 118,199,000  
Investing activities:                                
Investment in consolidated banking subsidiaries                         0 0 (180,000,000)  
Increase in other investments                         (11,668,000) (2,454,000) (1,411,000)  
Net cash used in investing activities                         (11,668,000) (2,454,000) (181,411,000)  
Financing activities:                                
Proceeds from (Repayments of) Debt                         0 (93,000) 316,078,000  
Repayment of other borrowings                         (120,000,000) (80,000,000) (49,880,000)  
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes                         (3,790,000) (2,488,000) 0  
Exercise of common stock options, net of shares surrendered for taxes                         (3,130,000) (2,577,000) (3,694,000)  
Issuance of preferred stock, net of issuance costs                         0 217,126,000 0  
Repurchase of common stock                         0 (50,790,000) (61,416,000)  
Common dividends paid                         (55,504,000) (49,389,000) (49,828,000)  
Preferred stock dividends paid                         (15,192,000) (7,596,000) 0  
Net cash provided by financing activities                         (197,616,000) 24,193,000 151,260,000  
Cash and Cash Equivalents, Period Increase (Decrease)                         (91,234,000) 93,797,000 88,048,000  
Cash and cash equivalents, beginning of year       $ 275,888,000       $ 182,091,000       $ 94,043,000 275,888,000 182,091,000 94,043,000  
Cash and cash equivalents, end of year 184,654,000       275,888,000       $ 182,091,000       184,654,000 275,888,000 182,091,000  
Banking                                
Assets [Abstract]                                
Investments in consolidated subsidiaries 5,329,003,000       4,972,160,000               5,329,003,000 4,972,160,000    
CONDENSED STATEMENTS OF OPERATIONS [Abstract]                                
Income from bank subsidiaries                         99,766,000 119,065,000 113,982,000  
Nonbank subsidiaries                                
Assets [Abstract]                                
Investments in consolidated subsidiaries $ 11,133,000       $ 9,322,000               11,133,000 9,322,000    
CONDENSED STATEMENTS OF OPERATIONS [Abstract]                                
Income from bank subsidiaries                         $ 89,000 $ 119,000 $ 178,000