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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments, Not Carried at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash, due from banks, money market,    and other interest-earning investments $ 1,682,617 $ 1,227,968  
Loans, net 47,395,737 35,893,365  
Noninterest-bearing demand deposits 12,691,658 9,399,019  
Time deposits 9,161,404 6,755,739  
Federal funds purchased and interbank borrowings 1 385  
Securities sold under agreements to repurchase 277,594 268,975 $ 244,626
FHLB advances 5,663,361 4,452,559  
Other borrowings 825,425 689,618  
Carrying Value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash, due from banks, money market,    and other interest-earning investments 1,682,617 1,227,968  
Accrued interest receivable 296,351 233,010  
Noninterest-bearing demand deposits 12,691,658 9,399,019  
Checking, NOW, savings, and money market    interest-bearing deposits 33,153,122 24,668,802  
Time deposits 9,161,404 6,755,739  
Federal funds purchased and interbank borrowings 1 385  
Securities sold under agreements to repurchase 277,594 268,975  
FHLB advances 5,663,361 4,452,559  
Other borrowings 825,425 689,618  
Accrued interest payable 63,539 65,057  
Standby letters of credit 1,643 1,742  
Commitments to extend credit 0 0  
Carrying Value | U.S. government-sponsored entities and agencies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities held to maturity 838,535 832,984  
Carrying Value | Mortgage-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities held to maturity 925,192 970,212  
Carrying Value | States and political subdivisions      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities held to maturity 1,146,488 1,151,685  
Carrying Value | Commercial      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 14,269,888 10,138,241  
Carrying Value | Commercial real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 21,799,953 16,105,961  
Carrying Value | Residential real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 8,158,696 6,774,664  
Carrying Value | Consumer credit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 3,167,200 2,874,499  
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash, due from banks, money market,    and other interest-earning investments 1,682,617 1,227,968  
Accrued interest receivable 1,166 912  
Noninterest-bearing demand deposits 12,691,658 9,399,019  
Checking, NOW, savings, and money market    interest-bearing deposits 33,153,122 24,668,802  
Time deposits 0 0  
Federal funds purchased and interbank borrowings 1 385  
Securities sold under agreements to repurchase 277,594 268,975  
FHLB advances 0 0  
Other borrowings 0 0  
Accrued interest payable 0 0  
Standby letters of credit 0 0  
Commitments to extend credit 0 0  
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government-sponsored entities and agencies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities held to maturity 0 0  
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities held to maturity 0 0  
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | States and political subdivisions      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities held to maturity 0 0  
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 0 0  
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 0 0  
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 0 0  
Estimate of Fair Value Measurement | Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer credit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 0 0  
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash, due from banks, money market,    and other interest-earning investments 0 0  
Accrued interest receivable 68,539 60,459  
Noninterest-bearing demand deposits 0 0  
Checking, NOW, savings, and money market    interest-bearing deposits 0 0  
Time deposits 9,131,299 6,727,453  
Federal funds purchased and interbank borrowings 0 0  
Securities sold under agreements to repurchase 0 0  
FHLB advances 5,638,547 4,340,188  
Other borrowings 823,929 689,246  
Accrued interest payable 63,539 65,057  
Standby letters of credit 0 0  
Commitments to extend credit 0 0  
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | U.S. government-sponsored entities and agencies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities held to maturity 705,894 664,331  
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities held to maturity 794,313 800,666  
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | States and political subdivisions      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities held to maturity 1,018,465 1,006,141  
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Commercial      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 0 0  
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Commercial real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 0 0  
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Residential real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 0 0  
Estimate of Fair Value Measurement | Significant Other Observable Inputs (Level 2) | Consumer credit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 0 0  
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash, due from banks, money market,    and other interest-earning investments 0 0  
Accrued interest receivable 226,646 171,639  
Noninterest-bearing demand deposits 0 0  
Checking, NOW, savings, and money market    interest-bearing deposits 0 0  
Time deposits 0 0  
Federal funds purchased and interbank borrowings 0 0  
Securities sold under agreements to repurchase 0 0  
FHLB advances 0 0  
Other borrowings 0 0  
Accrued interest payable 0 0  
Standby letters of credit 1,643 1,742  
Commitments to extend credit 5,869 3,403  
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | U.S. government-sponsored entities and agencies      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities held to maturity 0 0  
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities held to maturity 0 0  
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | States and political subdivisions      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities held to maturity 0 0  
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Commercial      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 14,364,783 10,158,299  
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Commercial real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 21,865,744 15,961,968  
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Residential real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 7,333,743 6,080,709  
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Consumer credit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net $ 3,049,702 $ 2,800,060