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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
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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

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