Benefit Plans (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Benefit Plans (Textual) [Abstract]
Accumulated liability for retirement benefits plan	$ 3,182,000	$ 2,957,000	$ 2,760,000	$ 2,549,000
Benefit Plans (Additional Textual) [Abstract]
Maximum percentage of employer match for employee voluntary contributions	5.00%
Maximum allowable amount of voluntary contributions by participants for 2017	$ 18,000
Additional catch-up deferral for plan participants over the age of 50	6,000
Total expense under the contribution retirement plan	361,000	$ 349,000	$ 307,000
Officer's Plan
Benefit Plans (Textual) [Abstract]
Accumulated liability for retirement benefits plan	2,700,000
Director's Plan
Benefit Plans (Textual) [Abstract]
Accumulated liability for retirement benefits plan	$ 500,000
Term of age
Benefit Plans (Textual) [Abstract]
Minimum Age Requirement for Additional Allowable Contributions	50 years
Supplemental Employee Retirement Plans, Defined Benefit
Benefit Plans (Textual) [Abstract]
Accumulated liability for retirement benefits plan	$ 3,200,000
Plan assets	$ 0
Supplemental Employee Retirement Plans, Defined Benefit | Directors and Officers
Benefit Plans (Textual) [Abstract]
Post-retirement benefits plan duration	15 years
Director Retirement Agreements annual benefit	$ 10,000
Director retirement benefits plan duration	10 years
Supplemental Employee Retirement Plans, Defined Benefit | Executive Officer
Benefit Plans (Textual) [Abstract]
Expected benefit expense as specified in the agreements for the entire year 2018	$ 426,000
Benefits expected to be paid in 2018 approximately	$ 162,000