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Securities (Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 1,001 |
Due after one year but within five years | 27,639 |
Due after five years but within ten years | 84,014 |
Due after ten years | 1,000 |
Mortgage-backed securities | 2,187,209 |
Amortized Cost | 2,300,863 | $ 1,432,684
Fair Value |  |
Due within one year | 1,031 |
Due after one year but within five years | 28,801 |
Due after five years but within ten years | 82,739 |
Due after ten years | 974 |
Mortgage-backed securities | 2,191,530 |
Total securities | 2,305,075 | 1,453,132
Amortized Cost |  |
Due within one year | 1,271 |
Due after one year but within five years | 536 |
Due after five years but within ten years | 8,388 |
Due after ten years | 335,670 |
Mortgage-backed securities | 22,028 |
Amortized Cost | 367,893 | 167,551
Fair Value |  |
Due within one year | 1,282 |
Due after one year but within five years | 550 |
Due after five years but within ten years | 8,525 |
Due after ten years | 336,710 |
Mortgage-backed securities | 22,886 |
Total securities | $ 369,953 | $ 170,734

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