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Securities - Schedule of Amortized Cost and Fair Value by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Available for Sale Amortized Cost |  |  |
1 year or less | $ 10,050 |  |
Over 1 year through 5 years | 121,477 |  |
Over 5 years through 10 years | 3,886 |  |
Over 10 years | 0 |  |
Total amortized cost | 167,089 | $ 160,290 |
Available for Sale Fair Value |  |  |
1 year or less | 10,013 |  |
Over 1 year through 5 years | 118,020 |  |
Over 5 years through 10 years | 3,833 |  |
Over 10 years | 0 |  |
Total securities available for sale | 162,957 | 159,051 |
Held-to-Maturity Amortized Cost |  |  |
1 year or less | 6,000 |  |
Over 1 year through 5 years | 6,000 |  |
Over 5 years through 10 years | 0 |  |
Over 10 years | 0 |  |
Total amortized costs | 33,517 | 44,829 | $ 47,369
Held-to-Maturity Fair Value |  |  |
1 year or less | 5,980 |  |
Over 1 year through 5 years | 5,903 |  |
Over 5 years through 10 years | 0 |  |
Over 10 years | 0 |  |
Securities held to maturity, fair value | 32,767 | 44,549 | $ 47,373
Mortgage-backed securities, residential |  |  |
Available for Sale Amortized Cost |  |  |
Without single maturity date | 31,676 |  |
Total amortized cost | 31,676 | 34,473 |
Available for Sale Fair Value |  |  |
Without single maturity date | 31,091 |  |
Total securities available for sale | 31,091 | 34,833 |
Held-to-Maturity Amortized Cost |  |  |
Without single maturity date | 21,517 |  |
Total amortized costs | 21,517 | 25,829 |
Held-to-Maturity Fair Value |  |  |
Without single maturity date | 20,884 |  |
Securities held to maturity, fair value | $ 20,884 | $ 25,646 |

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