Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Employer's matching contribution to 401(k) of employees hired on or after January 1, 2009			50.00%
Maximum annual contribution per employee, percent			3.00%
Automatic Annual Contribution Employees Hired Before January 1, 2009 Benefit Reduction Under Certain Amendments Minimum			5.00%
Automatic Annual Contribution Employees Hired Before January 1, 2009 Due Benefit Reduction Under Certain Amendments Maximum			7.00%
Funding and administrative costs of noncontributory defined benefit retirement plan and 401(k) plan [Abstract]
401(k) plan	$ 90	$ 83	$ 177	$ 161
Qualified noncontributory defined benefit retirement plan [Member]
Funding and administrative costs of noncontributory defined benefit retirement plan and 401(k) plan [Abstract]
Qualified noncontributory defined benefit retirement plan	273	209	543	416
Components of net periodic pension cost [Abstract]
Service cost	10	17	19	34
Interest cost	17	15	34	30
Amortization of unrecognized net loss	43	0	85	0
Amortization of unrecognized prior service cost	0	4	0	8
Net periodic pension cost	70	$ 36	138	$ 72
Recognized in accumulated other comprehensive income [Abstract]
Net actuarial loss	$ 283		$ 283		$ 339