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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, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash, due from banks, money market,    and other interest-earning investments $ 1,826,177 $ 1,227,968
Loans, net 48,194,642 35,893,365
Noninterest-bearing demand deposits 13,247,483 9,399,019
Time deposits 9,661,024 6,755,739
Federal funds purchased and interbank borrowings 100,197 385
Securities sold under agreements to repurchase 261,366 268,975
Federal Home Loan Bank advances 6,237,375 4,452,559
Other borrowings 852,429 689,618
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 1,826,177 1,227,968
Accrued interest receivable 306,812 233,010
Noninterest-bearing demand deposits 13,247,483 9,399,019
Checking, NOW, savings, and money market    interest-bearing deposits 32,179,688 24,668,802
Time deposits 9,661,024 6,755,739
Federal funds purchased and interbank borrowings 100,197 385
Securities sold under agreements to repurchase 261,366 268,975
Federal Home Loan Bank advances 6,237,375 4,452,559
Other borrowings 852,429 689,618
Accrued interest payable 65,291 65,057
Standby letters of credit 1,672 1,742
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 840,435 832,984
Carrying Value | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities held-to-maturity 910,323 970,212
Carrying Value | States and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities held-to-maturity 1,144,730 1,151,685
Carrying Value | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 14,737,809 10,138,241
Carrying Value | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 21,780,686 16,105,961
Carrying Value | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 8,433,102 6,774,664
Carrying Value | Consumer    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, net 3,243,045 2,874,499
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 1,826,177 1,227,968
Accrued interest receivable 894 912
Noninterest-bearing demand deposits 13,247,483 9,399,019
Checking, NOW, savings, and money market    interest-bearing deposits 32,179,688 24,668,802
Time deposits 0 0
Federal funds purchased and interbank borrowings 100,197 385
Securities sold under agreements to repurchase 261,366 268,975
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 77,288 60,459
Noninterest-bearing demand deposits 0 0
Checking, NOW, savings, and money market    interest-bearing deposits 0 0
Time deposits 9,540,748 6,727,453
Federal funds purchased and interbank borrowings 0 0
Securities sold under agreements to repurchase 0 0
Federal Home Loan Bank advances 6,229,752 4,340,188
Other borrowings 853,938 689,246
Accrued interest payable 65,291 65,057
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 710,909 664,331
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 782,818 800,666
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 1,046,511 1,006,141
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 228,630 171,639
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 1,672 1,742
Commitments to extend credit 5,687 3,403
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 14,831,563 10,158,299
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 21,806,075 15,961,968
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 7,526,511 6,080,709
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 $ 3,027,561 $ 2,800,060