Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Available for sale at fair value:
Available for sale at fair value, Within one year	$ 2,408
Available for sale at fair value yield, Within one year	2.91%
Available for sale at fair value, After one through five years	$ 18,677
Available for sale at fair value yield, After one through five years	3.03%
Available for sale at fair value, After five through ten years	$ 21,379
Available for sale at fair value yield, After five through ten years	3.04%
Available for sale at fair value, After ten years	$ 3,470
Available for sale at fair value yield, After ten years	2.77%
Available-for-sale Securities	$ 45,934
Available for sale at fair value yield	3.01%
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	$ 6,469
Held to maturity at cost yield, After one through five years	4.93%
Held to maturity at cost, After five through ten years	$ 5,989
Held to maturity at cost yield, After five through ten years	2.61%
Held to maturity at cost, After ten years	$ 2,322
Held to maturity at cost yield, After ten years	4.22%
Amortized cost	$ 14,780	$ 14,875
Held to maturity at cost yield	3.88%
Equity Securities:
Equity securities, Within one year	$ 0
Equity securities, Within one year, Yield	0.00%
Equity securities, After one through five years	$ 0
Equity securities, Within one year, Yield	0.00%
Equity securities, After ten years	$ 0
Equity securities, After ten years, Yield	0.00%
Equity securities, After ten years	$ 2,248
Equity securities, After ten years, Yield	2.17%
Equity securities	$ 2,248	2,144
Equity securities, Yield	2.17%
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	$ 3,693
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	$ 1,985
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	$ 5,678	5,642
Available for sale at fair value yield	1.81%
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	$ 1,002
Held to maturity at cost yield, After one through five years	2.03%
Held to maturity at cost, After five through ten years	$ 1,525
Held to maturity at cost yield, After five through ten years	1.94%
Held to maturity at cost, After ten years	$ 0
Held to maturity at cost yield, After ten years	0.00%
Amortized cost	$ 2,527	2,527
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	$ 2,340
Available for sale at fair value yield, Within one year	2.91%
Available for sale at fair value, After one through five years	$ 0
Available for sale at fair value yield, After one through five years	0.00%
Available for sale at fair value, After five through ten years	$ 874
Available for sale at fair value yield, After five through ten years	2.50%
Available for sale at fair value, After ten years	$ 1,288
Available for sale at fair value yield, After ten years	2.74%
Available-for-sale Securities	$ 4,502	4,498
Available for sale at fair value yield	2.78%
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	$ 494
Held to maturity at cost yield, After one through five years	5.06%
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	$ 951	951
Held to maturity at cost yield	5.43%
Residential mortgage-backed securities
Available for sale at fair value:
Available for sale at fair value, Within one year	$ 68
Available for sale at fair value yield, Within one year	2.94%
Available for sale at fair value, After one through five years	$ 8,750
Available for sale at fair value yield, After one through five years	2.69%
Available for sale at fair value, After five through ten years	$ 14,851
Available for sale at fair value yield, After five through ten years	2.95%
Available for sale at fair value, After ten years	$ 2,182
Available for sale at fair value yield, After ten years	2.79%
Available-for-sale Securities	$ 25,851	26,613
Available for sale at fair value yield	2.85%
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	$ 460
Held to maturity at cost yield, After one through five years	3.32%
Held to maturity at cost, After five through ten years	$ 924
Held to maturity at cost yield, After five through ten years	3.15%
Held to maturity at cost, After ten years	$ 1,865
Held to maturity at cost yield, After ten years	3.82%
Amortized cost	$ 3,249	3,312
Held to maturity at cost yield	3.56%
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	$ 3,540
Held to maturity at cost yield, After five through ten years	2.76%
Held to maturity at cost, After ten years	$ 0
Held to maturity at cost yield, After ten years	0.00%
Amortized cost	$ 3,540	3,570
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	$ 6,234
Available for sale at fair value yield, After one through five years	4.34%
Available for sale at fair value, After five through ten years	$ 3,669
Available for sale at fair value yield, After five through ten years	4.00%
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	$ 9,903
Available for sale at fair value yield	4.21%
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	$ 4,513
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	$ 4,513	$ 4,515
Held to maturity at cost yield	5.73%