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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments, Not Carried at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash, due from banks, money market,    and other interest-earning investments $ 939,499 $ 1,175,058  
Loans, net 33,303,606 32,684,317  
Noninterest-bearing demand deposits 9,257,709 9,664,247  
Time deposits 5,950,834 5,579,144  
Federal funds purchased and interbank borrowings 50,416 390  
Securities sold under agreements to repurchase 274,493 285,206 $ 393,018
Federal Home Loan Bank advances 4,193,039 4,280,681  
Other borrowings 813,213 764,870  
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   671,126  
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   881,994  
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   1,048,068  
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 939,499 1,175,058  
Accrued interest receivable 219,809 225,159  
Noninterest-bearing demand deposits 9,257,709 9,664,247  
Checking, NOW, savings, and money market    interest-bearing deposits 22,490,875 21,991,789  
Time deposits 5,950,834 5,579,144  
Federal funds purchased and interbank borrowings 50,416 390  
Securities sold under agreements to repurchase 274,493 285,206  
Federal Home Loan Bank advances 4,193,039 4,280,681  
Other borrowings 813,213 764,870  
Accrued interest payable 54,690 57,094  
Standby letters of credit 1,379 1,318  
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 827,684 825,953  
Carrying Value | Mortgage-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities held to maturity 1,016,858 1,029,131  
Carrying Value | States and political subdivisions      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities held to maturity 1,156,807 1,158,409  
Carrying Value | Commercial      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 9,522,947 9,392,267  
Carrying Value | Commercial real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 14,492,040 13,984,273  
Carrying Value | Residential real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 6,639,480 6,678,606  
Carrying Value | Consumer credit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans, net 2,649,139 2,629,171  
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 939,499 1,175,058  
Accrued interest receivable 1,133 859  
Noninterest-bearing demand deposits 9,257,709 9,664,247  
Checking, NOW, savings, and money market    interest-bearing deposits 22,490,875 21,991,789  
Time deposits 0 0  
Federal funds purchased and interbank borrowings 50,416 390  
Securities sold under agreements to repurchase 274,493 285,206  
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 47,057 54,465  
Noninterest-bearing demand deposits 0 0  
Checking, NOW, savings, and money market    interest-bearing deposits 0 0  
Time deposits 5,913,854 5,552,538  
Federal funds purchased and interbank borrowings 0 0  
Securities sold under agreements to repurchase 0 0  
Federal Home Loan Bank advances 3,994,880 4,090,954  
Other borrowings 798,748 755,592  
Accrued interest payable 54,690 57,094  
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 662,735    
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 857,657    
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 1,027,184    
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 171,619 169,835  
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 1,379 1,318  
Commitments to extend credit 3,824 3,839  
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 9,357,300 9,258,193  
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 14,005,872 13,640,868  
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 5,682,754 5,579,999  
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 $ 2,607,831 $ 2,555,121