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Investments (Amortized Cost and Fair Values Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Schedule of Investments [Line Items] |  |
Amortized Cost: Due after one year through five years | $ 10,657 |
Amortized Cost: Due after five years through ten years | 18,268 |
Amortized Cost: Due after ten years | 34,551 |
Amortized Cost: Sub Total | 63,476 |
Fair Value: Due after one year through five years | 10,544 |
Fair Value: Due after five years through ten years | 17,872 |
Fair Value: Due after ten years | 29,418 |
Available For Sale Debt Maturities Fair Value Sub Total | 57,834 |
Available-for-sale Securities, Amortized Cost Basis | 135,746 | $ 149,561
Available-for-sale Securities | 129,198 | 140,000
Amortized Cost: Due after five years through ten years, Held to maturity | 15,806 |
Amortized Cost: Due after ten years, Held to maturity | 8,510 |
Amortized Cost: Total, Held to maturity | 24,316 |
Fair Value: Due after five years through ten years, Held to maturity | 16,380 |
Fair Value: Due after ten years, Held to maturity | 9,802 |
Fair Value: Total, Held to maturity | 26,182 |
Held-to-maturity securities | 98,354 | 97,169
Held-to-maturity securities, fair value | 100,365 | 97,981
Residential mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity securities | 52,064 | 50,384
Held-to-maturity securities, fair value | 51,860 | 50,265
Commercial mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 42,854 | 52,978
Available-for-sale Securities | 42,343 | 52,222
Held-to-maturity securities | 17,437 | 17,584
Held-to-maturity securities, fair value | 17,847 | 17,832
Collateralized mortgage obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 29,416 | 19,953
Available-for-sale Securities | 29,021 | 19,567
Held-to-maturity securities | 4,537 | 4,833
Held-to-maturity securities, fair value | $ 4,476 | $ 4,684

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