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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, 2023
Dec. 31, 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 $ 1,175,058 $ 728,412
Loans, net 32,684,317 30,819,970
Noninterest-bearing demand deposits 9,664,247 11,930,798
Time deposits 5,579,144 3,013,780
Federal funds purchased and interbank borrowings 390 581,489
Securities sold under agreements to repurchase 285,206 432,804
Federal Home Loan Bank advances 4,280,681 3,829,018
Other borrowings 764,870 743,003
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 1,175,058 728,412
Accrued interest receivable 225,159 190,521
Noninterest-bearing demand deposits 9,664,247 11,930,798
Checking, NOW, savings, and money market    interest-bearing deposits 21,991,789 20,056,252
Time deposits 5,579,144 3,013,780
Federal funds purchased and interbank borrowings 390 581,489
Securities sold under agreements to repurchase 285,206 432,804
Federal Home Loan Bank advances 4,280,681 3,829,018
Other borrowings 764,870 743,003
Accrued interest payable 57,094 19,547
Standby letters of credit 1,318 755
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 825,953 819,168
Carrying Value | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities held-to-maturity 1,029,131 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 1,158,409 1,163,162
Carrying Value | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 9,392,267 9,386,862
Carrying Value | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 13,984,273 12,317,825
Carrying Value | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 6,678,606 6,438,525
Carrying Value | Consumer    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 2,629,171 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 1,175,058 728,412
Accrued interest receivable 859 758
Noninterest-bearing demand deposits 9,664,247 11,930,798
Checking, NOW, savings, and money market    interest-bearing deposits 21,991,789 20,056,252
Time deposits 0 0
Federal funds purchased and interbank borrowings 390 581,489
Securities sold under agreements to repurchase 285,206 432,804
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 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 54,465 52,081
Noninterest-bearing demand deposits 0 0
Checking, NOW, savings, and money market    interest-bearing deposits 0 0
Time deposits 5,552,538 2,976,389
Federal funds purchased and interbank borrowings 0 0
Securities sold under agreements to repurchase 0 0
Federal Home Loan Bank advances 4,090,954 3,739,780
Other borrowings 755,592 703,156
Accrued interest payable 57,094 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 671,126 656,358
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 881,994 982,963
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 1,048,068 1,004,361
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 169,835 137,682
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 1,318 755
Commitments to extend credit 3,839 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 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 9,258,193 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 13,640,868 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 5,579,999 5,372,491
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 $ 2,555,121 $ 2,557,115