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Securities (Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 0 |
Due after one year but within five years | 58,721 |
Due after five years but within ten years | 0 |
Due after ten years | 5,000 |
Mortgage-backed securities | 634,176 |
Amortized Cost | 697,897 | $ 513,741
Fair Value |  |
Due within one year | 0 |
Due after one year but within five years | 59,661 |
Due after five years but within ten years | 0 |
Due after ten years | 5,075 |
Mortgage-backed securities | 640,488 |
Total securities | 705,224 | 501,351
Amortized Cost |  |
Due within one year | 1,165 |
Due after one year but within five years | 21,645 |
Due after five years but within ten years | 6,673 |
Due after ten years | 814 |
Mortgage-backed securities | 43,968 |
Amortized Cost | 74,265 | 101,237
Fair Value |  |
Due within one year | 1,168 |
Due after one year but within five years | 21,925 |
Due after five years but within ten years | 6,718 |
Due after ten years | 853 |
Mortgage-backed securities | 43,801 |
Total securities | $ 74,465 | $ 99,906

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