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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 ($) | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | $ 4,104,622,000 | $ 4,253,637,000
Carrying Amount |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 4,913,457,000 | 4,997,335,000
Loans | 13,586,807,000 | 13,698,701,000
Financial Instruments - Liabilities |  |
Time Deposits | 3,079,187,000 | 3,057,302
Securities Sold Under Agreements to Repurchase | 150,490,000 | 150,490,000
Other Debt | 550,000,000 | 550,000,000
Fair Value |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 4,104,622,000 | 4,253,637,000
Loans | 12,639,643,000 | 12,872,260,000
Financial Instruments - Liabilities |  |
Time Deposits | 3,060,493,000 | 3,043,258
Securities Sold Under Agreements to Repurchase | 152,830,000 | 155,461,000
Other Debt | 545,546,000 | 541,466,000
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 115,118,000 | 116,531,000
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 |  |
Held-to-Maturity: Fair Value | 3,989,504,000 | 4,137,106,000
Loans | 0 | 0
Financial Instruments - Liabilities |  |
Time Deposits | 3,060,493,000 | 3,043,258
Securities Sold Under Agreements to Repurchase | 152,830,000 | 155,461,000
Other Debt | 545,546,000 | 541,466,000
Significant Other Unobservable Inputs (Level 3) | Fair Value |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 0 | 0
Loans | 12,639,643,000 | 12,872,260,000
Financial Instruments - Liabilities |  |
Time Deposits | 0 | 0
Securities Sold Under Agreements to Repurchase | 0 | 0
Other Debt | $ 0 | $ 0

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