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Securities Securities - Amortized Cost, Allowance for Credit Losses and Estimated Fair Value of Securities Held to Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | $ 3,570,028 | $ 3,619,738
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 39,203 | 43,066
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 110,960 | 130,760
Debt Securities, Held-to-maturity, Fair Value | 3,498,271 | 3,532,044
Securities, held-to-maturity, allowance for credit loss | (310) | (310)
Securities held to maturity, net of allowance for credit losses of $310 at both September 30, 2024 and December 31, 2023 | 3,569,718 | 3,619,428
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 1,211,798 | 1,250,431
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 7,380 | 76
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 39,632 | 54,175
Debt Securities, Held-to-maturity, Fair Value | 1,179,546 | 1,196,332
Securities, held-to-maturity, allowance for credit loss | 0 | 0
Securities held to maturity, net of allowance for credit losses of $310 at both September 30, 2024 and December 31, 2023 | 1,211,798 | 1,250,431
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 2,356,730 | 2,367,807
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 31,823 | 42,990
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 71,318 | 76,540
Debt Securities, Held-to-maturity, Fair Value | 2,317,235 | 2,334,257
Securities, held-to-maturity, allowance for credit loss | (310) | (310)
Securities held to maturity, net of allowance for credit losses of $310 at both September 30, 2024 and December 31, 2023 | 2,356,420 | 2,367,497
Other Investments [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 1,500 | 1,500
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 10 | 45
Debt Securities, Held-to-maturity, Fair Value | 1,490 | 1,455
Securities, held-to-maturity, allowance for credit loss | 0 | 0
Securities held to maturity, net of allowance for credit losses of $310 at both September 30, 2024 and December 31, 2023 | $ 1,500 | $ 1,500

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