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Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Investments [Line Items] |  |
Available for sale Securities, Amortized Cost, Due in 1 year or less | $ 1,460 |
Available for sale Securities, Amortized Cost, Due after 1 year but within 5 years | 18,711 |
Available for sale Securities, Amortized Cost, Due after 5 years but within 10 years | 43,730 |
Available for sale Securities, Amortized Cost, Due after 10 years | 9,597 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Total | 73,498 |
Available-for-sale securities, Amortized Cost | 117,211 |
Available for sale Securities, Fair Value, Due in 1 year or less | 1,460 |
Available for sale Securities, Fair Value, Due after 1 year but within 5 years | 18,050 |
Available for sale Securities, Fair Value, Due after 5 years but within 10 years | 41,041 |
Available for sale Securities, Fair Value, Due after 10 years | 8,714 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value, Total | 69,265 |
Available for sale Securities, Fair Value | 111,691 | $ 92,959
Held-to-maturity, Due in 1 year or less, Amortized Cost | 2,001 |
Held-to-maturity, Due after 1 year through 5 years, Amortized Cost | 11,705 |
Held-to-maturity, Due after 5 years through 10 years, Amortized Cost | 71,195 |
Held-to-maturity, Due after 10 years, Amortized Cost | 1,909 |
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis | 86,810 |
Held-to-maturity debt securities, Amortized Cost | 153,321 | 101,356
Held-to-maturity, Due in 1 year or less, Fair Value | 1,991 |
Held-to-maturity, Due after 1 year through 5, Fair Value | 11,494 |
Held-to-maturity, Due after 5 years through 10 years, Fair Value | 69,796 |
Held-to-maturity, Due after 10 years, Fair Value | 1,868 |
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value | 85,149 |
Held-to-maturity, Fair Value | 150,016 | $ 100,483
Mortgage-backed securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Securities without a Single Maturity Date, Amortized Cost | 43,713 |
Available for sale securities without a Single Maturity Date, Fair Value | 42,426 |
Held-to-maturity without Single Maturity Date, Amortized Cost | 66,511 |
Held-to-maturity without Single Maturity Date, Fair Value | $ 64,867 |

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