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Investments (Amortized Cost and Fair Values Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Investments [Line Items] |  |
Amortized Cost: Due after one year through five years | $ 15,858 |
Amortized Cost: Due after five years through ten years | 20,741 |
Amortized Cost: Due after ten years | 35,022 |
Amortized Cost: Sub Total | 71,621 |
Fair Value: Due after one year through five years | 15,497 |
Fair Value: Due after five years through ten years | 19,904 |
Fair Value: Due after ten years | 31,286 |
Available For Sale Debt Maturities Fair Value Sub Total | 66,687 |
Available-for-sale Securities, Amortized Cost Basis | 153,281 | $ 153,552
Available-for-sale Securities | 145,604 | 146,470
Amortized Cost: Due after five years through ten years, Held to maturity | 15,911 |
Amortized Cost: Due after ten years, Held to maturity | 8,510 |
Amortized Cost: Total, Held to maturity | 24,421 |
Fair Value: Due after five years through ten years, Held to maturity | 16,027 |
Fair Value: Due after ten years, Held to maturity | 9,342 |
Fair Value: Total, Held to maturity | 25,369 |
Held-to-maturity securities | 91,878 | 93,632
Held-to-maturity securities, fair value | 91,335 | 95,346
Residential mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity securities | 46,312 | 47,771
Held-to-maturity securities, fair value | 45,108 | 47,442
Commercial mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 41,431 | 41,771
Available-for-sale Securities | 40,028 | 40,891
Held-to-maturity securities | 17,090 | 17,288
Held-to-maturity securities, fair value | 16,990 | 17,518
Collateralized mortgage obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 40,229 | 41,298
Available-for-sale Securities | 38,889 | 40,384
Held-to-maturity securities | 4,055 | 4,187
Held-to-maturity securities, fair value | $ 3,868 | $ 4,118

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