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Investments (Amortized Cost and Fair Values Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Investments [Line Items] |  |
Amortized Cost: Due after one year through five years | $ 16,943 |
Amortized Cost: Due after five years through ten years | 19,020 |
Amortized Cost: Due after ten years | 33,482 |
Amortized Cost: Sub Total | 69,445 |
Fair Value: Due after one year through five years | 16,534 |
Fair Value: Due after five years through ten years | 18,053 |
Fair Value: Due after ten years | 31,248 |
Available For Sale Debt Maturities Fair Value Sub Total | 65,835 |
Available-for-sale Securities, Amortized Cost Basis | 148,998 | $ 153,552
Available-for-sale Securities | 142,303 | 146,470
Amortized Cost: Due after five years through ten years, Held to maturity | 15,946 |
Amortized Cost: Due after ten years, Held to maturity | 8,420 |
Amortized Cost: Total, Held to maturity | 24,366 |
Fair Value: Due after five years through ten years, Held to maturity | 15,934 |
Fair Value: Due after ten years, Held to maturity | 9,266 |
Fair Value: Total, Held to maturity | 25,200 |
Held-to-maturity securities | 90,295 | 93,632
Held-to-maturity securities, fair value | 89,242 | 95,346
Residential mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity securities | 45,297 | 47,771
Held-to-maturity securities, fair value | 43,855 | 47,442
Commercial mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 40,450 | 41,771
Available-for-sale Securities | 38,843 | 40,891
Held-to-maturity securities | 16,643 | 17,288
Held-to-maturity securities, fair value | 16,416 | 17,518
Collateralized mortgage obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 39,103 | 41,298
Available-for-sale Securities | 37,625 | 40,384
Held-to-maturity securities | 3,989 | 4,187
Held-to-maturity securities, fair value | $ 3,771 | $ 4,118

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