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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, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | $ 3,691,487 | $ 2,639,241
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 24,288 | 13,048
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 171,846 | 184,424
Debt Securities, Held-to-maturity, Fair Value | 3,543,929 | 2,467,865
Securities, held-to-maturity, allowance for credit loss | (267) | (158)
Securities held to maturity, net of allowance for credit losses of $267 at June 30, 2023 and $158 at December 31, 2022 | 3,691,220 | 2,639,083
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 1,265,818 | 526,122
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 72,286 | 65,322
Debt Securities, Held-to-maturity, Fair Value | 1,193,532 | 460,800
Securities, held-to-maturity, allowance for credit loss | 0 | 0
Securities held to maturity, net of allowance for credit losses of $267 at June 30, 2023 and $158 at December 31, 2022 | 1,265,818 | 526,122
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 2,424,169 | 2,111,619
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 24,288 | 13,048
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 99,491 | 119,033
Debt Securities, Held-to-maturity, Fair Value | 2,348,966 | 2,005,634
Securities, held-to-maturity, allowance for credit loss | (267) | (158)
Securities held to maturity, net of allowance for credit losses of $267 at June 30, 2023 and $158 at December 31, 2022 | 2,423,902 | 2,111,461
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 | 69 | 69
Debt Securities, Held-to-maturity, Fair Value | 1,431 | 1,431
Securities, held-to-maturity, allowance for credit loss | 0 | 0
Securities held to maturity, net of allowance for credit losses of $267 at June 30, 2023 and $158 at December 31, 2022 | $ 1,500 | $ 1,500

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