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Investments (Amortized Cost and Fair Values Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Schedule of Investments [Line Items] |  |
Amortized Cost: Due after one year through five years | $ 10,662 |
Amortized Cost: Due after five years through ten years | 18,687 |
Amortized Cost: Due after ten years | 45,864 |
Amortized Cost: Sub Total | 75,213 |
Fair Value: Due after one year through five years | 10,541 |
Fair Value: Due after five years through ten years | 18,174 |
Fair Value: Due after ten years | 38,517 |
Available For Sale Debt Maturities Fair Value Sub Total | 67,232 |
Available-for-sale Securities, Amortized Cost Basis | 146,204 | $ 149,561
Available-for-sale Securities | 136,937 | 140,000
Amortized Cost: Due after five years through ten years, Held to maturity | 15,772 |
Amortized Cost: Due after ten years, Held to maturity | 8,630 |
Amortized Cost: Total, Held to maturity | 24,402 |
Fair Value: Due after five years through ten years, Held to maturity | 16,290 |
Fair Value: Due after ten years, Held to maturity | 9,062 |
Fair Value: Total, Held to maturity | 25,352 |
Held-to-maturity securities | 98,019 | 97,169
Held-to-maturity securities, fair value | 98,916 | 97,981
Residential mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity securities | 51,515 | 50,384
Held-to-maturity securities, fair value | 51,312 | 50,265
Commercial mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 51,321 | 52,978
Available-for-sale Securities | 50,394 | 52,222
Held-to-maturity securities | 17,509 | 17,584
Held-to-maturity securities, fair value | 17,761 | 17,832
Collateralized mortgage obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 19,670 | 19,953
Available-for-sale Securities | 19,311 | 19,567
Held-to-maturity securities | 4,593 | 4,833
Held-to-maturity securities, fair value | $ 4,491 | $ 4,684

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