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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, 2023
Dec. 31, 2022
Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash, due from banks, money market,    and other interest-earning investments $ 1,663,430 $ 728,412  
Loans, net 32,273,852 30,819,970  
Accrued interest receivable 209,503 190,521  
Noninterest-bearing demand deposits 10,091,352 11,930,798  
Time deposits 5,575,704 3,013,780  
Federal funds purchased and interbank borrowings 918 581,489  
Securities sold under agreements to repurchase 279,061 432,804 $ 438,053
Federal Home Loan Bank advances 4,412,576 3,829,018  
Other borrowings 863,455 743,003  
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  
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  
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  
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   656,358  
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   982,963  
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   1,004,361  
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  
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  
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  
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 1,663,430 728,412  
Accrued interest receivable 209,503 190,521  
Noninterest-bearing demand deposits 10,091,352 11,930,798  
Checking, NOW, savings, and money market    interest-bearing deposits 21,585,620 20,056,252  
Time deposits 5,575,704 3,013,780  
Federal funds purchased and interbank borrowings 918 581,489  
Securities sold under agreements to repurchase 279,061 432,804  
Federal Home Loan Bank advances 4,412,576 3,829,018  
Other borrowings 863,455 743,003  
Accrued interest payable 46,934 19,547  
Standby letters of credit 1,224 755  
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 824,223 819,168  
Carrying Value | Mortgage-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities held to maturity 1,043,585 1,106,817  
Carrying Value | States and political subdivisions      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities held to maturity 1,160,106 1,163,162  
Carrying Value | Commercial      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 9,207,028 9,386,862  
Carrying Value | Commercial real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 13,770,202 12,317,825  
Carrying Value | Residential real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 6,675,508 6,438,525  
Carrying Value | Consumer credit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 2,621,114 2,676,758  
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 1,663,430 728,412  
Accrued interest receivable 1,093 758  
Noninterest-bearing demand deposits 10,091,352 11,930,798  
Checking, NOW, savings, and money market    interest-bearing deposits 21,585,620 20,056,252  
Time deposits 0 0  
Federal funds purchased and interbank borrowings 918 581,489  
Securities sold under agreements to repurchase 279,061 432,804  
Federal Home Loan Bank 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    
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    
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    
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 45,597 52,081  
Noninterest-bearing demand deposits 0 0  
Checking, NOW, savings, and money market    interest-bearing deposits 0 0  
Time deposits 5,527,361 2,976,389  
Federal funds purchased and interbank borrowings 0 0  
Securities sold under agreements to repurchase 0 0  
Federal Home Loan Bank advances 4,167,911 3,739,780  
Other borrowings 843,629 703,156  
Accrued interest payable 46,934 19,547  
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 617,010    
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 847,652    
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 928,959    
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 162,813 137,682  
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  
Federal Home Loan Bank advances 0 0  
Other borrowings 0 0  
Accrued interest payable 0 0  
Standby letters of credit 1,224 755  
Commitments to extend credit 3,582 3,666  
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    
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    
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    
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 9,078,129 9,066,583  
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 13,302,502 11,867,851  
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 5,630,855 5,372,491  
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 $ 2,526,277 $ 2,557,115