Investment Securities - Gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (Details 2) $ in Thousands		Jun. 30, 2017 USD ($) Securities Security	Dec. 31, 2016 USD ($) Securities Security
Available-for-Sale
Less than Twelve Months Number of individual securities | Security		10	9
Less than Twelve Months, unrealized losses		$ 85	$ 159
Less than Twelve Months, fair value		$ 11,543	$ 11,437
Twelve Months or More Number of individual securities | Security		4	2
Twelve Months or More, unrealized losses		$ 39	$ 14
Twelve Months or More, fair value		$ 2,909	$ 987
Total Number of Individual Securities | Security		14	11
Total Unrealized Losses		$ 124	$ 173
Total Fair Value		$ 14,452	$ 12,424
Held-to-Maturity
Less than Twelve Months Number of individual securities | Securities		8	15
Less than Twelve Months, Unrealized Losses		$ 16	$ 74
Less than Twelve Months, Fair Value		$ 2,149	$ 4,453
Twelve Months or More Number of individual securities | Securities		1	1
Twelve Months or More, Unrealized Losses
Twelve Months or More, Fair Value		$ 45	$ 45
Total Number of Individual Securities | Securities		9	16
Total Unrealized Losses		$ 16	$ 74
Total Fair Value		$ 2,194	$ 4,498
U.S. Government and agency obligations
Available-for-Sale
Less than Twelve Months Number of individual securities | Security		8	6
Less than Twelve Months, unrealized losses		$ 63	$ 110
Less than Twelve Months, fair value		$ 9,046	$ 6,996
Twelve Months or More Number of individual securities | Security		1
Twelve Months or More, unrealized losses		$ 17
Twelve Months or More, fair value		$ 982
Total Number of Individual Securities | Security		9	6
Total Unrealized Losses		$ 80	$ 110
Total Fair Value		$ 10,028	$ 6,996
Mortgage-backed securities - residential
Available-for-Sale
Less than Twelve Months Number of individual securities | Security		2	3
Less than Twelve Months, unrealized losses		$ 22	$ 49
Less than Twelve Months, fair value		$ 2,497	$ 4,441
Twelve Months or More Number of individual securities | Security		3	2
Twelve Months or More, unrealized losses		$ 22	$ 14
Twelve Months or More, fair value		$ 1,927	$ 987
Total Number of Individual Securities | Security		5	5
Total Unrealized Losses		$ 44	$ 63
Total Fair Value		$ 4,424	$ 5,428
Held-to-Maturity
Less than Twelve Months Number of individual securities | Securities	[1]	1	1
Less than Twelve Months, Unrealized Losses	[1]
Less than Twelve Months, Fair Value	[1]	$ 175	$ 178
Twelve Months or More Number of individual securities | Securities	[1]
Twelve Months or More, Unrealized Losses	[1]
Twelve Months or More, Fair Value	[1]
Total Number of Individual Securities | Securities	[1]	1	1
Total Unrealized Losses	[1]
Total Fair Value	[1]	$ 175	$ 178
State and Municipal securities
Held-to-Maturity
Less than Twelve Months Number of individual securities | Securities	[1]	7	14
Less than Twelve Months, Unrealized Losses	[1]	$ 16	$ 74
Less than Twelve Months, Fair Value	[1]	$ 1,974	$ 4,275
Twelve Months or More Number of individual securities | Securities	[1]	1	1
Twelve Months or More, Unrealized Losses	[1]
Twelve Months or More, Fair Value	[1]	$ 45	$ 45
Total Number of Individual Securities | Securities	[1]	8	15
Total Unrealized Losses	[1]	$ 16	$ 74
Total Fair Value	[1]	$ 2,019	$ 4,320

[1] Aggregate unrealized loss position of these securities is less than $500.