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Derivative Financial Instruments - Schedule of the Notional Amount and Fair Value of the Derivative Financial Instruments (Details) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Interest Rate Swap Agreements:    
Derivative [Line Items]    
Notional Amount $ 1,000,000,000  
Interest Rate Swap Agreements: | Derivatives designated as hedging instruments    
Derivative [Line Items]    
Notional Amount 1,400,000,000 $ 2,000,000,000
Fair Value (8,631,000) 2,738,000
Interest Rate Lock Commitments | Derivatives not designated as hedging instruments    
Derivative [Line Items]    
Notional Amount 2,286,000 1,534,000
Fair Value 49,000 34,000
Forward Commitments | Derivatives not designated as hedging instruments    
Derivative [Line Items]    
Notional Amount 3,250,000 3,517,000
Fair Value (10,000) 6,000
Receive Fixed/Pay Variable Swaps | Derivatives not designated as hedging instruments    
Derivative [Line Items]    
Notional Amount 2,285,594,000 2,123,665,000
Fair Value (71,345,000) (136,218,000)
Pay Fixed/Receive Variable Swaps | Derivatives not designated as hedging instruments    
Derivative [Line Items]    
Notional Amount 2,285,594,000 2,123,665,000
Fair Value 71,222,000 136,125,000
Conversion Rate Swap Agreements    
Derivative [Line Items]    
Liability derivatives 0 0
Conversion Rate Swap Agreements | Derivatives not designated as hedging instruments    
Derivative [Line Items]    
Notional Amount 103,508,000 96,466,000
Makewhole Agreements    
Derivative [Line Items]    
Liability derivatives 0  
Makewhole Agreements | Derivatives not designated as hedging instruments    
Derivative [Line Items]    
Notional Amount 46,901,000 65,763,000
Forward Swap | Derivatives designated as hedging instruments    
Derivative [Line Items]    
Notional Amount 600,000,000 300,000,000
Fair Value $ 1,500,000 $ 4,700,000