Pension Plans and Other Postretirement Benefits (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan [Member]
Change in benefit obligation:
Projected benefit obligation at beginning of year	$ 40,994	$ 41,736	$ 39,553
Service cost	0	0	0
Interest cost	1,369	1,427	1,658
Plan amendments	0	0	0
Actuarial loss (gain)	984	2,046	4,650
Benefits paid	(1,715)	(1,664)	(1,664)
Settlements	(2,149)	(2,551)	(2,461)
Projected benefit obligation at end of year	39,483	40,994	41,736
Change in plan assets:
Fair value of plan assets at beginning of year	32,757	31,653	29,273
Actual return on plan assets	4,396	3,168	911
Employer contributions	3,103	2,534	5,926
Benefits paid	(1,715)	(1,664)	(1,664)
Expenses paid	(513)	(383)	(332)
Settlements	(2,149)	(2,551)	(2,461)
Fair value of plan assets at end of year	35,879	32,757	31,653
Funded status	(3,604)	(8,237)	(10,083)
Prepaid (accrued) benefit expense	12,331	11,188	11,594
Total amount recognized in Consolidated Balance Sheets, all in other liabilities	(3,604)	(8,237)	(10,083)
Amounts recognized in accumulated other comprehensive income (loss) ("AOCI"):
Prior service cost	0	0	0
Net actuarial loss	15,935	19,425	21,677
Total amount recognized in AOCI	15,935	19,425	21,677
Information for pension plans with an accumulated benefit obligation greater than plan assets:
Projected benefit obligation	39,483	40,994	41,736
Accumulated benefit obligation	39,483	40,994	41,736
Fair value of plan assets	35,879	32,757	31,653
Supplemental Defined Benefit Plans [Member]
Change in benefit obligation:
Projected benefit obligation at beginning of year	18,192	18,012	16,801
Service cost	0	0	0
Interest cost	616	676	799
Plan amendments	0	0	0
Actuarial loss (gain)	(783)	817	1,755
Benefits paid	(1,319)	(1,313)	(1,343)
Settlements	0	0	0
Projected benefit obligation at end of year	16,706	18,192	18,012
Change in plan assets:
Fair value of plan assets at beginning of year	0	0	0
Actual return on plan assets	0	0	0
Employer contributions	1,319	1,313	1,343
Benefits paid	(1,319)	(1,313)	(1,343)
Expenses paid	0	0	0
Settlements	0	0	0
Fair value of plan assets at end of year	0	0	0
Funded status	(16,706)	(18,192)	(18,012)
Prepaid (accrued) benefit expense	(12,479)	(12,855)	(13,197)
Total amount recognized in Consolidated Balance Sheets, all in other liabilities	(16,706)	(18,192)	(18,012)
Amounts recognized in accumulated other comprehensive income (loss) ("AOCI"):
Prior service cost	0	124	249
Net actuarial loss	4,227	5,213	4,566
Total amount recognized in AOCI	4,227	5,337	4,815
Information for pension plans with an accumulated benefit obligation greater than plan assets:
Projected benefit obligation	16,706	18,192	18,012
Accumulated benefit obligation	16,706	18,192	18,012
Fair value of plan assets	$ 0	$ 0	$ 0