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Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Investments [Line Items] |  |
Available for sale Securities, Amortized Cost, Due after 1 year but within 5 years | $ 19,586 |
Available for sale Securities, Amortized Cost, Due after 5 years but within 10 years | 43,451 |
Available for sale Securities, Amortized Cost, Due after 10 years | 12,109 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Total | 75,146 |
Available-for-sale securities, Amortized Cost | 116,823 |
Available for sale Securities, Fair Value, Due after 1 year but within 5 years | 18,828 |
Available for sale Securities, Fair Value, Due after 5 years but within 10 years | 40,271 |
Available for sale Securities, Fair Value, Due after 10 years | 11,241 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value, Total | 70,340 |
Available for sale Securities, Fair Value | 110,527 | $ 92,959
Held-to-maturity, Due in 1 year or less, Amortized Cost | 3,084 |
Held-to-maturity, Due after 1 year through 5 years, Amortized Cost | 15,466 |
Held-to-maturity, Due after 5 years through 10 years, Amortized Cost | 82,415 |
Held-to-maturity, Due after 10 years, Amortized Cost | 1,212 |
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis | 102,177 |
Held-to-maturity debt securities, Amortized Cost | 171,521 | 101,356
Held-to-maturity, Due in 1 year or less, Fair Value | 3,080 |
Held-to-maturity, Due after 1 year through 5, Fair Value | 15,163 |
Held-to-maturity, Due after 5 years through 10 years, Fair Value | 80,337 |
Held-to-maturity, Due after 10 years, Fair Value | 1,192 |
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value | 99,772 |
Held-to-maturity, Fair Value | 167,120 | $ 100,483
Mortgage-backed securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Securities without a Single Maturity Date, Amortized Cost | 41,677 |
Available for sale securities without a Single Maturity Date, Fair Value | 40,187 |
Held-to-maturity without Single Maturity Date, Amortized Cost | 69,344 |
Held-to-maturity without Single Maturity Date, Fair Value | $ 67,348 |

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