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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, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash, due from banks, money market,    and other interest-earning investments $ 728,412 $ 822,019
Loans, net 30,819,970 13,494,505
Accrued interest receivable 190,521 84,109
Noninterest-bearing demand deposits 11,930,798 6,303,106
Time deposits 3,013,780 960,413
Federal funds purchased and interbank borrowings 581,489 276
Securities sold under agreements to repurchase 432,804 392,275
Federal Home Loan Bank advances 3,829,018 1,886,019
Other borrowings 743,003 296,670
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 728,412 822,019
Accrued interest receivable 190,521 84,109
Noninterest-bearing demand deposits 11,930,798 6,303,106
Checking, NOW, savings, and money market    interest-bearing deposits 20,056,252 11,305,676
Time deposits 3,013,780 960,413
Federal funds purchased and interbank borrowings 581,489 276
Securities sold under agreements to repurchase 432,804 392,275
Federal Home Loan Bank advances 3,829,018 1,886,019
Other borrowings 743,003 296,670
Accrued interest payable 19,547 5,496
Standby letters of credit 755 454
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 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 1,106,817  
Carrying Value | States and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities held-to-maturity 1,163,162  
Carrying Value | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 9,386,862 3,363,175
Carrying Value | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 12,317,825 6,315,574
Carrying Value | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 6,438,525 2,245,942
Carrying Value | Consumer credit, net of unearned income    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 2,676,758 1,569,814
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 728,412 822,019
Accrued interest receivable 758 688
Noninterest-bearing demand deposits 11,930,798 6,303,106
Checking, NOW, savings, and money market    interest-bearing deposits 20,056,252 11,305,676
Time deposits 0 0
Federal funds purchased and interbank borrowings 581,489 276
Securities sold under agreements to repurchase 432,804 392,275
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, net of unearned income    
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 52,081 35,790
Noninterest-bearing demand deposits 0 0
Checking, NOW, savings, and money market    interest-bearing deposits 0 0
Time deposits 2,976,389 968,658
Federal funds purchased and interbank borrowings 0 0
Securities sold under agreements to repurchase 0 0
Federal Home Loan Bank advances 3,739,780 1,935,140
Other borrowings 703,156 311,532
Accrued interest payable 19,547 5,496
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 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 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 1,004,361  
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 credit, net of unearned income    
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 137,682 47,631
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 755 454
Commitments to extend credit 3,666 4,678
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 9,066,583 3,335,009
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 11,867,851 6,211,854
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 5,372,491 2,216,900
Estimate of Fair Value Measurement | Significant Unobservable Inputs (Level 3) | Consumer credit, net of unearned income    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net $ 2,557,115 $ 1,582,600