Employee Benefit and Deferred Compensation Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension Benefits
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	318	187	636	375
Expected return on plan assets	(539)	(309)	(1,078)	(620)
Prior service cost recognized	0	0	0	0
Recognized actuarial loss	46	102	91	199
Net periodic benefit cost (return)	(175)	(20)	(351)	(46)
Other Benefits
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans
Service cost	6	6	12	13
Interest cost	23	15	46	27
Expected return on plan assets	0	0	0	0
Prior service cost recognized	0	0	0	0
Recognized actuarial loss	27	36	54	55
Net periodic benefit cost (return)	$ 56	$ 57	$ 112	$ 95