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Investment Securities (Amortized Cost and Fair Values Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Investments [Line Items] |  |
Amortized Cost: Due after one year through five years | $ 10,667 |
Amortized Cost: Due after five years through ten years | 19,576 |
Amortized Cost: Due after ten years | 46,387 |
Amortized Cost, Single Maturity Date, Total | 76,630 |
Fair Value: Due after one year through five years | 10,524 |
Fair Value: Due after five years through ten years | 19,027 |
Fair Value: Due after ten years | 38,660 |
Fair Value: Single Maturity Date, Total | 68,211 |
Available for sale debt maturities fair value sub total | 140,000 |
Available For Sale Debt Maturities Amortized Cost Total | 149,561 |
Available-for-sale Securities, Amortized Cost Basis | 149,561 | $ 177,070
Available-for-sale Securities | 140,000 | 170,232
Amortized Cost: Due after five years through ten years, Held to maturity | 15,738 |
Amortized Cost: Due after ten years, Held to maturity | 8,630 |
Amortized Cost: Total, Held to maturity | 24,368 |
Fair Value: Due after five years through ten years, Held to maturity | 16,250 |
Fair Value: Due after ten years, Held to maturity | 8,950 |
Fair Value: Total, Held to maturity | 25,200 |
Held-to-maturity Securities | 97,169 | 105,560
Held-to-maturity Securities, Fair Value | 97,981 | 106,742
Residential mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis |  | 14,285
Available-for-sale Securities |  | 14,170
Held-to-maturity Securities | 50,384 | 53,734
Held-to-maturity Securities, Fair Value | 50,265 | 53,912
Commercial mortgage-backed agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost: without Single Maturity Date | 52,978 |
Fair Value: without Single Maturity Date | 52,222 |
Available-for-sale Securities, Amortized Cost Basis | 52,978 | 43,780
Available-for-sale Securities | 52,222 | 43,636
Held-to-maturity Securities | 17,584 | 18,078
Held-to-maturity Securities, Fair Value | 17,832 | 18,232
Collateralized mortgage obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost: without Single Maturity Date | 19,953 |
Fair Value: without Single Maturity Date | 19,567 |
Available-for-sale Securities, Amortized Cost Basis | 19,953 | 9,690
Available-for-sale Securities | 19,567 | 9,610
Held-to-maturity Securities | 4,833 | 6,419
Held-to-maturity Securities, Fair Value | $ 4,684 | $ 6,297

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