Employee Benefit Plans (Details)	3 Months Ended
	Mar. 31, 2016 USD ($) Plan $ / shares shares	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Employee Benefit Plans [Abstract]
Number of plans | Plan	2
Defined Contribution Plan [Abstract]
Employer contribution to 401 (k) defined contribution plan	$ 83,000	$ 62,000
Directors [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation liability	923,000		$ 958,000
Deferred interest expense	4,000	7,000
Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Service cost	90,000	86,000
Interest cost	172,000	102,000
Expected return on plan assets	(260,000)	(207,000)
Net amortization and deferral	61,000	48,000
Net periodic benefit cost	63,000	29,000
Employer contribution to pension plan	500,000
Supplemental Executive Retirement Plans [Member]
Components of net periodic benefit cost [Abstract]
Obligation included in other liabilities	1,369,000		1,339,000
Cost recognized	30,000	35,000
Continuation of Life Insurance Plan [Member]
Components of net periodic benefit cost [Abstract]
Obligation included in other liabilities	574,000		574,000
Salary Continuation Plan [Member]
Components of net periodic benefit cost [Abstract]
Obligation included in other liabilities	717,000		$ 710,000
Cost recognized	$ 16,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) | shares	150,000
Number of shares available for grant (in shares) | shares	59,162
Restricted stock activity [Roll Forward]
Outstanding, beginning of period (in shares) | shares	8,269
Granted (in shares) | shares	0
Forfeited (in shares) | shares	0
Vested (in shares) | shares	(158)
Outstanding, end of period (in shares) | shares	8,111
Weighted average market price [Roll Forward]
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 49.98
Granted (in dollars per share) | $ / shares	0
Forfeited (in dollars per share) | $ / shares	0
Vested (in dollars per share) | $ / shares	51.25
Outstanding, end of period (in dollars per share) | $ / shares	$ 49.96
Additional General Disclosures [Abstract]
Share-based compensation expense	$ 47,000	$ 42,000
Compensation cost related to nonvested awards that has not yet been recognized	$ 405,000
Period over which compensation cost is expected to be recognized	2 years 9 months