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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 | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | $ 3,486,600 | $ 3,534,085
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 617 | 13,954
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 269,008 | 187,493
Debt Securities, Held-to-maturity, Fair Value | 3,218,209 | 3,360,546
Securities, held-to-maturity, allowance for credit loss | (310) | (310)
Securities held to maturity, net of allowance for credit losses of $310 at both June 30, 2025 and December 31, 2024 | 3,486,290 | 3,533,775
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 1,160,686 | 1,193,840
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 44,267 | 71,076
Debt Securities, Held-to-maturity, Fair Value | 1,116,419 | 1,122,764
Securities, held-to-maturity, allowance for credit loss | 0 | 0
Securities held to maturity, net of allowance for credit losses of $310 at both June 30, 2025 and December 31, 2024 | 1,160,686 | 1,193,840
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 2,324,414 | 2,338,745
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 617 | 13,954
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 224,735 | 116,414
Debt Securities, Held-to-maturity, Fair Value | 2,100,296 | 2,236,285
Securities, held-to-maturity, allowance for credit loss | (310) | (310)
Securities held to maturity, net of allowance for credit losses of $310 at both June 30, 2025 and December 31, 2024 | 2,324,104 | 2,338,435
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 | 6 | 3
Debt Securities, Held-to-maturity, Fair Value | 1,494 | 1,497
Securities, held-to-maturity, allowance for credit loss | 0 | 0
Securities held to maturity, net of allowance for credit losses of $310 at both June 30, 2025 and December 31, 2024 | $ 1,500 | $ 1,500

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