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Parent Company Only Financial Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investment in unconsolidated subsidiaries:        
Other assets $ 2,605,173,000 $ 2,613,139,000    
Total assets 52,589,449,000 47,959,883,000    
Liabilities and Equity [Abstract]        
Subordinated debt and other borrowings 425,821,000 424,938,000    
Other Liabilities 728,758,000 544,722,000    
Stockholders' equity 6,431,881,000 6,035,788,000 $ 5,519,392,000 $ 5,310,607,000
Total liabilities and shareholders' equity 52,589,449,000 47,959,883,000    
Expenses:        
Personnel expense, including stock compensation 621,031,000 531,828,000 510,175,000  
Income tax expense (benefit) 106,153,000 151,854,000 136,751,000  
Net income 475,056,000 562,152,000 560,742,000  
Preferred stock dividends 15,192,000 15,192,000 15,192,000  
Net income available to common shareholders 459,864,000 546,960,000 545,550,000  
CONDENSED STATEMENTS OF CASH FLOWS [Abstract]        
Net income 475,056,000 562,152,000 560,742,000  
Adjustments to reconcile net income to net cash provided by operating activities:          
Depreciation, amortization and accretion 98,582,000 78,698,000 62,298,000  
Stock-based compensation expense 40,934,000 41,879,000 39,552,000  
Deferred tax (expense) benefit (19,351,000) 72,368,000 19,740,000  
Income from equity method investment (63,172,000) (85,402,000) (145,466,000)  
Dividends received from equity method investment 71,689,000 36,694,000 63,114,000  
Excess tax benefit from stock compensation 2,806,000 208,000 3,027,000  
(Increase) decrease in other assets 6,524,000 (262,851,000) (82,436,000)  
Increase (decrease) in other liabilities 154,450,000 7,944,000 (26,620,000)  
Net cash provided by operating activities 904,306,000 478,404,000 604,925,000  
Investing activities:        
Increase in other investments (93,932,000) (92,997,000) (90,967,000)  
Net cash used in investing activities (3,672,452,000) (4,602,439,000) (6,684,439,000)  
Financing activities:        
Issuance of common stock pursuant to performance-based vesting (PSUs) and time-based vesting (RSUs) restricted stock units, net of shares withheld for taxes and related tax benefit (14,430,000) (3,725,000) (5,462,000)  
Common dividends paid 69,014,000 68,737,000 68,194,000  
Preferred stock dividends paid 15,192,000 15,192,000 15,192,000  
Net cash provided by financing activities 3,973,722,000 5,177,002,000 3,155,357,000  
Investment Income, Dividend 109,900,000 106,200,000 110,800,000  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 1,205,576,000 1,052,967,000 (2,924,157,000)  
Contribution of Property 134,700,000      
Parent Company        
Assets [Abstract]        
Cash and cash equivalents 235,047,000 197,079,000 186,572,000 $ 184,654,000
Investment in unconsolidated subsidiaries:        
Unconsolidated subsidiaries 3,995,000 3,995,000    
Other investments 71,067,000 67,848,000    
Current income tax receivable 0 32,466,000    
Other assets 32,567,000 144,597,000    
Total assets 6,876,824,000 6,586,188,000    
Liabilities and Equity [Abstract]        
Subordinated debt and other borrowings 425,821,000 424,938,000    
Other Liabilities 19,122,000 125,462,000    
Stockholders' equity 6,431,881,000 6,035,788,000    
Total liabilities and shareholders' equity 6,876,824,000 6,586,188,000    
CONDENSED STATEMENTS OF OPERATIONS [Abstract]        
Income from equity method investment 0 0 33,817,000  
Other income (loss) 10,722,000 12,360,000 6,478,000  
Expenses:        
Interest expense 26,899,000 23,263,000 18,590,000  
Personnel expense, including stock compensation 40,934,000 41,879,000 39,552,000  
Other expense 3,831,000 3,180,000 3,025,000  
Income before income taxes and equity in undistributed income of subsidiaries 49,271,000 50,991,000 90,107,000  
Income tax expense (benefit) (17,422,000) (13,547,000) (8,444,000)  
Income before equity in undistributed income of subsidiaries 66,693,000 64,538,000 98,551,000  
Equity in undistributed income of bank subsidiaries 406,609,000 496,236,000 461,004,000  
Equity in undistributed income (loss) of nonbank subsidiaries 1,754,000 1,378,000 1,187,000  
Net income 475,056,000 562,152,000 560,742,000  
Preferred stock dividends (15,192,000) (15,192,000) (15,192,000)  
Net income available to common shareholders 459,864,000 546,960,000 545,550,000  
CONDENSED STATEMENTS OF CASH FLOWS [Abstract]        
Net income 475,056,000 562,152,000 560,742,000  
Adjustments to reconcile net income to net cash provided by operating activities:          
Depreciation, amortization and accretion 883,000 883,000 882,000  
Stock-based compensation expense 40,934,000 41,879,000 39,552,000  
Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable (117,879,000) 89,597,000 28,281,000  
Deferred tax (expense) benefit (2,677,000) 3,014,000 1,760,000  
Income from equity method investment 0 0 (33,817,000)  
Dividends received from equity method investment 0 0 10,365,000  
Excess tax benefit from stock compensation (2,806,000) (208,000) (3,027,000)  
Loss (gain) on other investments, net 924,000 (2,088,000) (2,563,000)  
(Increase) decrease in other assets 147,172,000 (88,227,000) (32,609,000)  
Increase (decrease) in other liabilities 14,345,000 1,099,000 3,881,000  
Equity in undistributed (income) loss of bank subsidiaries (406,609,000) (496,236,000) (461,004,000)  
Equity in undistributed (income) loss of nonbank subsidiaries (1,754,000) (1,378,000) (1,187,000)  
Net cash provided by operating activities 147,589,000 110,487,000 111,256,000  
Investing activities:        
Investment in consolidated nonbanking subsidiaries (1,000,000) (10,000,000) 0  
Proceeds from Divestiture of Interest in Consolidated Subsidiaries 0 (9,691,000) 0  
Increase in other investments (4,143,000) (8,802,000) (15,776,000)  
Net cash used in investing activities (5,143,000) (9,111,000) (15,776,000)  
Financing activities:        
Issuance of common stock pursuant to performance-based vesting (PSUs) and time-based vesting (RSUs) restricted stock units, net of shares withheld for taxes and related tax benefit (14,430,000) (3,725,000) (5,462,000)  
Exercise of common stock options, net of shares surrendered for taxes (5,842,000) (3,215,000) (4,714,000)  
Common dividends paid (69,014,000) (68,737,000) (68,194,000)  
Preferred stock dividends paid (15,192,000) (15,192,000) (15,192,000)  
Net cash provided by financing activities (104,478,000) (90,869,000) (93,562,000)  
Cash and cash equivalents, beginning of year 197,079,000 186,572,000 184,654,000  
Cash and cash equivalents, end of year 235,047,000 197,079,000 186,572,000  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 37,968,000 10,507,000 $ 1,918,000  
Banking        
Assets [Abstract]        
Investments in consolidated subsidiaries $ 6,517,369,000 $ 6,126,172,000    
Financing activities:        
Revenues Pinnacle Bank Pinnacle Bank Pinnacle Bank  
Nonbank subsidiaries        
Assets [Abstract]        
Investments in consolidated subsidiaries $ 16,779,000 $ 14,031,000    
Financing activities:        
Revenues Pinnacle Bank Pinnacle Bank Pinnacle Bank