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Available-for-Sale and Held-to-Maturity Securities (Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Investments, Debt and Equity Securities [Abstract] |  |  |  |
Available-for-sale Securities, debt maturities, within one year, Amortized Cost |  | $ 86,971 |  | $ 16,047
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost |  | 206,234 |  | 185,012
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost |  | 38,502 |  | 123,696
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost |  | 456,440 |  | 442,055
Available-for-sale Securities, debt maturities, after ten years, Amortized Cost |  | 974,592 |  | 1,096,409
Available-for-sale Securities, Amortized Cost |  | 1,762,739 |  | 1,863,219
Available-for-sale Securities, debt maturities, within one year, Fair Value |  | 85,380 | [1] | 15,877
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value |  | 191,070 |  | 178,776
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value |  | 32,679 |  | 108,707
Available-for-sale Securities, debt maturities, after five through ten years, fair value |  | 386,538 | [1] | 380,362
Availably-for-sale Securities, debt maturities, after ten years, Fair Value |  | 816,566 | [1] | 952,319
Available-for-sale Securities, debt maturities, Fair Value |  | 1,512,233 | [1] | 1,636,041
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost |  | 2,765,980 |  | 2,413,239
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost |  | 3,134,399 |  | 3,577,212
Held-to-maturity Securities, Amortized cost | [2] | 5,900,379 |  | 5,990,451
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value |  | 2,725,890 |  | 2,323,608
Held-to-maturity Securities, debt maturities, after ten years, Fair Value |  | 3,085,710 |  | 3,414,810
Held-to-maturity Securities, debt maturities, Fair Value | [2] | $ 5,811,600 |  | $ 5,738,418
[1] | Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.
[2] | Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.

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