Employee Benefit Plans (Details)	3 Months Ended
	Mar. 31, 2018 USD ($) Installment Director	Mar. 31, 2017 USD ($)
401(k) Plan [Abstract]
Minimum age to participate	18 years
Annual contribution per employee	100.00%
Employer matching contribution percentage on first 6% of deferred compensation	100.00%
Percent of employee's compensation deferred that receives company match	6.00%
Additional safe harbor contribution by employer, percent	3.00%
401(k) expenses	$ 172,000	$ 194,000
Deferred Compensation Plan [Abstract]
Number of directors participated in Deferred Compensation Plan | Director	0
Bank-owned life insurance	$ 89,000	89,000
Accrued liability for deferred compensation program	98,000,000	93,000,000
Former Key Employee [Member]
Deferred Compensation Plan [Abstract]
Deferred compensation expense	13,000	0
Bank-owned life insurance	7,100	7,000
Cash surrender value of life insurance policies	$ 1,300,000	$ 1,300,000
Maximum [Member]
401(k) Plan [Abstract]
Employer matching contribution	6.00%
Deferred Compensation Plan [Abstract]
Number of installments for contributions | Installment	5
Minimum [Member]
Deferred Compensation Plan [Abstract]
Number of installments for contributions | Installment	1