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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, 2024 | Dec. 31, 2023
--- | --- | ---
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | $ 4,072,596 | $ 4,253,637
Carrying Amount |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 4,710,245 | 4,997,335
Loans | 13,647,538 | 13,698,701
Financial Instruments - Liabilities |  |
Time Deposits | 3,168,526 | 3,057,302
Securities Sold Under Agreements to Repurchase | 100,490 | 150,490
Other Debt | 550,000 | 550,000
Fair Value |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 4,072,596 | 4,253,637
Loans | 13,049,917 | 12,872,260
Financial Instruments - Liabilities |  |
Time Deposits | 3,164,895 | 3,043,258
Securities Sold Under Agreements to Repurchase | 103,969 | 155,461
Other Debt | 559,580 | 541,466
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 119,850 | 116,531
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 | 3,952,746 | 4,137,106
Loans | 0 | 0
Financial Instruments - Liabilities |  |
Time Deposits | 3,164,895 | 3,043,258
Securities Sold Under Agreements to Repurchase | 103,969 | 155,461
Other Debt | 559,580 | 541,466
Significant Other Unobservable Inputs (Level 3) | Fair Value |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 0 | 0
Loans | 13,049,917 | 12,872,260
Financial Instruments - Liabilities |  |
Time Deposits | 0 | 0
Securities Sold Under Agreements to Repurchase | 0 | 0
Other Debt | $ 0 | $ 0

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