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Securities (Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 0 |
Due after one year but within five years | 28,691 |
Due after five years but within ten years | 59,024 |
Due after ten years | 1,000 |
Mortgage-backed securities | 670,861 |
Amortized Cost | 759,576 | $ 812,202
Fair Value |  |
Due within one year | 0 |
Due after one year but within five years | 30,393 |
Due after five years but within ten years | 59,260 |
Due after ten years | 880 |
Mortgage-backed securities | 694,299 |
Total securities | 784,832 | 821,945
Amortized Cost |  |
Due within one year | 1,501 |
Due after one year but within five years | 4,856 |
Due after five years but within ten years | 3,587 |
Due after ten years | 48,593 |
Mortgage-backed securities | 36,387 |
Amortized Cost | 94,924 | 67,932
Fair Value |  |
Due within one year | 1,520 |
Due after one year but within five years | 4,982 |
Due after five years but within ten years | 3,669 |
Due after ten years | 48,784 |
Mortgage-backed securities | 37,363 |
Total securities | $ 96,318 | $ 68,333

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