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Securities (Securities Moody's and Standard & Poor's Bond Rating) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | $ 2,639,241 | $ 1,749,337
States and Political Subdivisions [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 2,111,619 | 1,220,573
States and Political Subdivisions [Member] | Not Guaranteed or Pre-Refunded [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 567,216 |
States and Political Subdivisions [Member] | Guaranteed by the Texas PSF [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 1,422,442 |
States and Political Subdivisions [Member] | Pre-Refunded [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 121,961 |
Other [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 1,500 | $ 1,500
Aaa/AAA [Member] | States and Political Subdivisions [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 1,817,604 |
Aaa/AAA [Member] | States and Political Subdivisions [Member] | Not Guaranteed or Pre-Refunded [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 273,201 |
Aaa/AAA [Member] | States and Political Subdivisions [Member] | Guaranteed by the Texas PSF [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 1,422,442 |
Aaa/AAA [Member] | States and Political Subdivisions [Member] | Pre-Refunded [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 121,961 |
Aaa/AAA [Member] | Other [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 0 |
Aa/AA [Member] | States and Political Subdivisions [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 294,015 |
Aa/AA [Member] | States and Political Subdivisions [Member] | Not Guaranteed or Pre-Refunded [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 294,015 |
Aa/AA [Member] | States and Political Subdivisions [Member] | Guaranteed by the Texas PSF [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 0 |
Aa/AA [Member] | States and Political Subdivisions [Member] | Pre-Refunded [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 0 |
Aa/AA [Member] | Other [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 0 |
Not rated [Member] | States and Political Subdivisions [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 0 |
Not rated [Member] | States and Political Subdivisions [Member] | Not Guaranteed or Pre-Refunded [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 0 |
Not rated [Member] | States and Political Subdivisions [Member] | Guaranteed by the Texas PSF [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 0 |
Not rated [Member] | States and Political Subdivisions [Member] | Pre-Refunded [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 0 |
Not rated [Member] | Other [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Amortized Cost | $ 1,500 |

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