Securities - Schedule of Marketable Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available for sale at fair value:
Available for sale at fair value, Within one year	$ 1,033
Available for sale at fair value yield, Within one year	3.71%
Available for sale at fair value, After one through five years	$ 21,214
Available for sale at fair value yield, After one through five years	2.93%
Available for sale at fair value, After five through ten years	$ 22,820
Available for sale at fair value yield, After five through ten years	2.91%
Available for sale at fair value, After ten years	$ 3,640
Available for sale at fair value yield, After ten years	2.69%
Available-for-sale Securities	$ 48,707
Available for sale at fair value yield	2.92%
Held to maturity at cost:
Held to maturity at cost, Within one year	$ 163
Held to maturity at cost yield, Within one year	1.50%
Held to maturity at cost, After one through five years	$ 6,170
Held to maturity at cost yield, After one through five years	5.18%
Held to maturity at cost, After five through ten years	$ 5,213
Held to maturity at cost yield, After five through ten years	2.31%
Held to maturity at cost, After ten years	$ 4,231
Held to maturity at cost yield, After ten years	3.62%
Amortized cost	$ 15,777	$ 16,307
Held to maturity at cost yield,	3.77%
Equity securities:
Equity securities at cost, Within one year	$ 0
Equity securities at cost yield, Within one year	0.00%
Equity securities at cost, After one through five years	$ 0
Equity securities at cost yield, After one through five years	0.00%
Equity securities at cost, After five through ten years	$ 0
Equity securities at cost yield, After five through ten years	0.00%
Equity securities at cost, After ten years	$ 1,198
Equity securities at cost yield, after ten years	2.04%
Equity securities	$ 1,198	1,206
Equity securities yield	2.04%
U.S. Government sponsored entities
Available for sale at fair value:
Available for sale at fair value, Within one year	$ 0
Available for sale at fair value yield, Within one year	0.00%
Available for sale at fair value, After one through five years	$ 3,653
Available for sale at fair value yield, After one through five years	1.61%
Available for sale at fair value, After five through ten years	$ 1,945
Available for sale at fair value yield, After five through ten years	2.17%
Available for sale at fair value, After ten years	$ 0
Available for sale at fair value yield, After ten years	0.00%
Available-for-sale Securities	$ 5,598	5,691
Available for sale at fair value yield	1.80%
Held to maturity at cost:
Held to maturity at cost, Within one year	$ 0
Held to maturity at cost yield, Within one year	0.00%
Held to maturity at cost, After one through five years	$ 0
Held to maturity at cost yield, After one through five years	0.00%
Held to maturity at cost, After five through ten years	$ 2,789
Held to maturity at cost yield, After five through ten years	1.98%
Held to maturity at cost, After ten years	$ 0
Held to maturity at cost yield, After ten years	0.00%
Amortized cost	$ 2,789	3,026
Held to maturity at cost yield,	1.98%
State and political subdivisions
Available for sale at fair value:
Available for sale at fair value, Within one year	$ 796
Available for sale at fair value yield, Within one year	3.89%
Available for sale at fair value, After one through five years	$ 359
Available for sale at fair value yield, After one through five years	2.41%
Available for sale at fair value, After five through ten years	$ 1,695
Available for sale at fair value yield, After five through ten years	2.41%
Available for sale at fair value, After ten years	$ 1,972
Available for sale at fair value yield, After ten years	2.69%
Available-for-sale Securities	$ 4,822	5,192
Available for sale at fair value yield	2.77%
Held to maturity at cost:
Held to maturity at cost, Within one year	$ 162
Held to maturity at cost yield, Within one year	1.48%
Held to maturity at cost, After one through five years	$ 494
Held to maturity at cost yield, After one through five years	5.07%
Held to maturity at cost, After five through ten years	$ 0
Held to maturity at cost yield, After five through ten years	0.00%
Held to maturity at cost, After ten years	$ 457
Held to maturity at cost yield, After ten years	5.84%
Amortized cost	$ 1,113	1,113
Held to maturity at cost yield,	4.86%
Residential mortgage-backed securities
Available for sale at fair value:
Available for sale at fair value, Within one year	$ 237
Available for sale at fair value yield, Within one year	3.11%
Available for sale at fair value, After one through five years	$ 11,565
Available for sale at fair value yield, After one through five years	2.75%
Available for sale at fair value, After five through ten years	$ 15,383
Available for sale at fair value yield, After five through ten years	2.81%
Available for sale at fair value, After ten years	$ 1,668
Available for sale at fair value yield, After ten years	2.68%
Available-for-sale Securities	$ 28,853	31,878
Available for sale at fair value yield	2.78%
Held to maturity at cost:
Held to maturity at cost, Within one year	$ 1
Held to maturity at cost yield, Within one year	4.23%
Held to maturity at cost, After one through five years	$ 1,156
Held to maturity at cost yield, After one through five years	3.09%
Held to maturity at cost, After five through ten years	$ 800
Held to maturity at cost yield, After five through ten years	3.09%
Held to maturity at cost, After ten years	$ 1,770
Held to maturity at cost yield, After ten years	3.77%
Amortized cost	$ 3,727	3,958
Held to maturity at cost yield,	3.41%
Commercial mortgage-backed securities
Held to maturity at cost:
Held to maturity at cost, Within one year	$ 0
Held to maturity at cost yield, Within one year	0.00%
Held to maturity at cost, After one through five years	$ 0
Held to maturity at cost yield, After one through five years	0.00%
Held to maturity at cost, After five through ten years	$ 1,624
Held to maturity at cost yield, After five through ten years	2.48%
Held to maturity at cost, After ten years	$ 2,004
Held to maturity at cost yield, After ten years	2.98%
Amortized cost	$ 3,628	3,685
Held to maturity at cost yield,	2.76%
Corporate and other securities
Available for sale at fair value:
Available for sale at fair value, Within one year	$ 0
Available for sale at fair value yield, Within one year	0.00%
Available for sale at fair value, After one through five years	$ 5,637
Available for sale at fair value yield, After one through five years	4.20%
Available for sale at fair value, After five through ten years	$ 3,797
Available for sale at fair value yield, After five through ten years	3.93%
Available for sale at fair value, After ten years	$ 0
Available for sale at fair value yield, After ten years	0.00%
Available-for-sale Securities	$ 9,434	10,732
Available for sale at fair value yield	4.09%
Held to maturity at cost:
Held to maturity at cost, Within one year	$ 0
Held to maturity at cost yield, Within one year	0.00%
Held to maturity at cost, After one through five years	$ 4,520
Held to maturity at cost yield, After one through five years	5.73%
Held to maturity at cost, After five through ten years	$ 0
Held to maturity at cost yield, After five through ten years	0.00%
Held to maturity at cost, After ten years	$ 0
Held to maturity at cost yield, After ten years	0.00%
Amortized cost	$ 4,520	$ 4,525
Held to maturity at cost yield,	5.73%