Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Available for sale at fair value:
Available for sale at fair value, Within one year	$ 407
Available for sale at fair value yield, Within one year	1.93%
Available for sale at fair value, After one through five years	$ 4,979
Available for sale at fair value yield, After one through five years	1.91%
Available for sale at fair value, After five through ten years	$ 13,346
Available for sale at fair value yield, After five through ten years	2.38%
Available for sale at fair value, After ten years	$ 33,514
Available for sale at fair value yield, After ten years	3.04%
Available-for-sale Securities	$ 52,246	$ 40,568
Available for sale at fair value yield	2.75%
Held to maturity at cost:
Held to maturity at cost, Within one year	$ 237
Held to maturity at cost yield, Within one year	1.32%
Held to maturity at cost, After one through five years	$ 34
Held to maturity at cost yield, After one through five years	5.63%
Held to maturity at cost, After five through ten years	$ 5,704
Held to maturity at cost yield, After five through ten years	5.32%
Held to maturity at cost, After ten years	$ 14,801
Held to maturity at cost yield, After ten years	3.78%
Amortized cost	$ 20,776	20,979
Held to maturity at cost yield	4.18%
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	$ 3,721
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	$ 0
Available for sale at fair value yield, After five through ten years	0.00%
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	$ 3,721	3,716
Available for sale at fair value yield	1.61%
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	$ 0
Held to maturity at cost yield, After five through ten years	0.00%
Held to maturity at cost, After ten years	$ 3,530
Held to maturity at cost yield, After ten years	1.97%
Amortized cost	$ 3,530	3,530
Held to maturity at cost yield	1.97%
State and political subdivisions
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	$ 769
Available for sale at fair value yield, After one through five years	3.13%
Available for sale at fair value, After five through ten years	$ 2,382
Available for sale at fair value yield, After five through ten years	2.78%
Available for sale at fair value, After ten years	$ 2,712
Available for sale at fair value yield, After ten years	2.80%
Available-for-sale Securities	$ 5,863	5,502
Available for sale at fair value yield	2.84%
Held to maturity at cost:
Held to maturity at cost, Within one year	$ 213
Held to maturity at cost yield, Within one year	0.99%
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	$ 493
Held to maturity at cost yield, After five through ten years	5.07%
Held to maturity at cost, After ten years	$ 1,598
Held to maturity at cost yield, After ten years	4.65%
Amortized cost	$ 2,304	2,306
Held to maturity at cost yield	4.40%
Residential mortgage-backed securities
Available for sale at fair value:
Available for sale at fair value, Within one year	$ 7
Available for sale at fair value yield, Within one year	3.97%
Available for sale at fair value, After one through five years	$ 425
Available for sale at fair value yield, After one through five years	2.39%
Available for sale at fair value, After five through ten years	$ 4,324
Available for sale at fair value yield, After five through ten years	2.28%
Available for sale at fair value, After ten years	$ 28,038
Available for sale at fair value yield, After ten years	2.91%
Available-for-sale Securities	$ 32,794	21,631
Available for sale at fair value yield	2.82%
Held to maturity at cost:
Held to maturity at cost, Within one year	$ 24
Held to maturity at cost yield, Within one year	4.26%
Held to maturity at cost, After one through five years	$ 34
Held to maturity at cost yield, After one through five years	5.63%
Held to maturity at cost, After five through ten years	$ 678
Held to maturity at cost yield, After five through ten years	2.83%
Held to maturity at cost, After ten years	$ 3,893
Held to maturity at cost yield, After ten years	3.47%
Amortized cost	$ 4,629	4,799
Held to maturity at cost yield	3.40%
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	$ 0
Held to maturity at cost yield, After five through ten years	0.00%
Held to maturity at cost, After ten years	$ 3,768
Held to maturity at cost yield, After ten years	2.76%
Amortized cost	$ 3,768	3,796
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	$ 400
Available for sale at fair value yield, Within one year	1.89%
Available for sale at fair value, After one through five years	$ 64
Available for sale at fair value yield, After one through five years	1.72%
Available for sale at fair value, After five through ten years	$ 6,640
Available for sale at fair value yield, After five through ten years	2.31%
Available for sale at fair value, After ten years	$ 2,764
Available for sale at fair value yield, After ten years	4.58%
Available-for-sale Securities	$ 9,868	9,719
Available for sale at fair value yield	2.92%
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	$ 4,533
Held to maturity at cost yield, After five through ten years	5.72%
Held to maturity at cost, After ten years	$ 2,012
Held to maturity at cost yield, After ten years	8.80%
Amortized cost	$ 6,545	$ 6,548
Held to maturity at cost yield	6.67%