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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments, Not Carried at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 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 $ 1,227,968 $ 1,175,058
Loans, net 35,893,365 32,684,317
Noninterest-bearing demand deposits 9,399,019 9,664,247
Time deposits 6,755,739 5,579,144
Federal funds purchased and interbank borrowings 385 390
Securities sold under agreements to repurchase 268,975 285,206
Federal Home Loan Bank advances 4,452,559 4,280,681
Other borrowings 689,618 764,870
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 1,227,968 1,175,058
Accrued interest receivable 233,010 225,159
Noninterest-bearing demand deposits 9,399,019 9,664,247
Checking, NOW, savings, and money market    interest-bearing deposits 24,668,802 21,991,789
Time deposits 6,755,739 5,579,144
Federal funds purchased and interbank borrowings 385 390
Securities sold under agreements to repurchase 268,975 285,206
Federal Home Loan Bank advances 4,452,559 4,280,681
Other borrowings 689,618 764,870
Accrued interest payable 65,057 57,094
Standby letters of credit 1,742 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 832,984 825,953
Carrying Value | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities held-to-maturity 970,212 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 1,151,685 1,158,409
Carrying Value | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 10,138,241 9,392,267
Carrying Value | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 16,105,961 13,984,273
Carrying Value | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 6,774,664 6,678,606
Carrying Value | Consumer    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 2,874,499 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 1,227,968 1,175,058
Accrued interest receivable 912 859
Noninterest-bearing demand deposits 9,399,019 9,664,247
Checking, NOW, savings, and money market    interest-bearing deposits 24,668,802 21,991,789
Time deposits 0 0
Federal funds purchased and interbank borrowings 385 390
Securities sold under agreements to repurchase 268,975 285,206
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 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    
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 60,459 54,465
Noninterest-bearing demand deposits 0 0
Checking, NOW, savings, and money market    interest-bearing deposits 0 0
Time deposits 6,727,453 5,552,538
Federal funds purchased and interbank borrowings 0 0
Securities sold under agreements to repurchase 0 0
Federal Home Loan Bank advances 4,340,188 4,090,954
Other borrowings 689,246 755,592
Accrued interest payable 65,057 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 664,331 671,126
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 800,666 881,994
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 1,006,141 1,048,068
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    
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 171,639 169,835
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 1,742 1,318
Commitments to extend credit 3,403 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 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 10,158,299 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 15,961,968 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 6,080,709 5,579,999
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Consumer    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net $ 2,800,060 $ 2,555,121