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Fair Value of Assets and Liabilities - Schedule of Carrying Amount, Fair Value, and Fair Value Hierarchy of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financial Instruments - Assets    
Investment Securities Held-to-Maturity $ 3,717,573 $ 3,820,882
Carrying Amount    
Financial Instruments - Assets    
Investment Securities Held-to-Maturity 4,340,032 4,618,543
Loans 13,719,997 13,777,756
Financial Instruments - Liabilities    
Time Deposits 3,051,354 3,059,575
Securities Sold Under Agreements to Repurchase 50,000 100,000
Other Debt 550,000 550,000
Fair Value    
Financial Instruments - Assets    
Investment Securities Held-to-Maturity 3,717,573 3,820,882
Loans 13,313,618 12,908,626
Financial Instruments - Liabilities    
Time Deposits 3,043,493 3,050,583
Securities Sold Under Agreements to Repurchase 51,516 101,478
Other Debt 545,664 538,808
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value    
Financial Instruments - Assets    
Investment Securities Held-to-Maturity 119,767 116,941
Loans 0 0
Financial Instruments - Liabilities    
Time Deposits 0 0
Securities Sold Under Agreements to Repurchase 0 0
Other Debt 0 0
Significant Other Observable Inputs (Level 2) | Fair Value    
Financial Instruments - Assets    
Investment Securities Held-to-Maturity 3,597,806 3,703,941
Loans 0 0
Financial Instruments - Liabilities    
Time Deposits 3,043,493 3,050,583
Securities Sold Under Agreements to Repurchase 51,516 101,478
Other Debt 545,664 538,808
Significant Unobservable Inputs (Level 3) | Fair Value    
Financial Instruments - Assets    
Investment Securities Held-to-Maturity 0 0
Loans 13,313,618 12,908,626
Financial Instruments - Liabilities    
Time Deposits 0 0
Securities Sold Under Agreements to Repurchase 0 0
Other Debt $ 0 $ 0