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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 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | $ 4,171,262 | $ 4,646,619
Carrying Amount |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 4,489,615 | 4,694,780
Loans | 12,224,018 | 11,921,869
Financial Instruments - Liabilities |  |
Time Deposits | 922,519 | 1,000,089
Securities Sold Under Agreements to Repurchase | 450,490 | 450,490
Fair Value |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 4,171,262 | 4,646,619
Loans | 11,931,447 | 12,094,631
Financial Instruments - Liabilities |  |
Time Deposits | 910,982 | 998,134
Securities Sold Under Agreements to Repurchase | 450,907 | 469,293
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 122,942 | 131,139
Loans | 0 | 0
Financial Instruments - Liabilities |  |
Time Deposits | 0 | 0
Securities Sold Under Agreements to Repurchase | 0 | 0
Significant Other Observable Inputs (Level 2) | Fair Value |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 4,048,320 | 4,515,480
Loans | 0 | 0
Financial Instruments - Liabilities |  |
Time Deposits | 910,982 | 998,134
Securities Sold Under Agreements to Repurchase | 450,907 | 469,293
Significant Other Unobservable Inputs (Level 3) | Fair Value |  |
Financial Instruments - Assets |  |
Held-to-Maturity: Fair Value | 0 | 0
Loans | 11,931,447 | 12,094,631
Financial Instruments - Liabilities |  |
Time Deposits | 0 | 0
Securities Sold Under Agreements to Repurchase | $ 0 | $ 0

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