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Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Investments Debt And Equity Securities [Abstract] |  |
Debt Securities Available for Sale, Due in one year or less, Amortized Cost | $ 112 |
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost | 919,639 |
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost | 2,982,549 |
Debt Securities Available for Sale, Due after ten years, Amortized Cost | 2,407,914 |
Securities Available for Sale, Gross Amortized Cost | 6,310,214 | $ 6,984,530
Debt Securities Available for Sale, Due in one year or less, Fair Value | 111 |
Debt Securities Available for Sale, Due after one year through five years, Fair Value | 871,760 |
Debt Securities Available for Sale, Due after five years through ten years, Fair Value | 2,665,232 |
Debt Securities Available for Sale, Due after ten years, Fair Value | 2,018,938 |
Total available for sale debt securities, Fair Value | 5,556,041 | 6,986,698
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost | 10,000 |
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost | 544,146 |
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost | 893,562 |
Debt Securities Held to Maturity, Due after ten years, Amortized Cost | 1,404,787 |
Total held to maturity debt securities, Amortized Cost | 2,852,495 | 1,565,751
Debt Securities Held to Maturity, Due in one year or less, Fair Value | 9,924 |
Debt Securities Held to Maturity, Due after one year through five years, Fair Value | 522,347 |
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value | 813,726 |
Debt Securities Held to Maturity, Due after ten years, Fair Value | 1,269,401 |
Total held to maturity debt securities, Fair Value | $ 2,615,398 | $ 1,631,482

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