Retirement Plans (Changes in Benefit Obligations, Components of Benefit Costs, Weighted-Average Assumptions, and Plan Assets) (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Assumptions (end of period): |
|
|
|
| Discount rate used in determining benefit obligation |
4.12%
|
3.86%
|
4.49%
|
| Reconciliation of funded status (end of period): |
|
|
|
| Accumulated benefit obligation |
$ (12,915)
|
$ (13,909)
|
$ (12,284)
|
| Projected benefit obligation |
(12,915)
|
(13,909)
|
(12,284)
|
| Fair value of plan assets |
10,419
|
11,290
|
10,851
|
| Defined benefit plan, funded status of plan, total |
(2,496)
|
(2,619)
|
(1,433)
|
| Net actuarial loss |
(3,957)
|
(4,000)
|
(2,277)
|
| Accumulated other comprehensive loss |
(3,957)
|
(4,000)
|
(2,277)
|
| Prepaid pension cost |
1,461
|
1,381
|
844
|
| Net amount recognized as of December 31 |
(2,496)
|
(2,619)
|
(1,433)
|
| Changes in projected benefit obligation: |
|
|
|
| Benefit obligation as of beginning of period |
13,909
|
12,284
|
13,439
|
| Interest cost |
518
|
532
|
505
|
| Actuarial liability loss |
(646)
|
1,947
|
(824)
|
| Benefits paid |
(866)
|
(854)
|
(836)
|
| Benefit obligation as of end of period |
12,915
|
13,909
|
12,284
|
| Change in plan assets: |
|
|
|
| Fair value of plan assets as of beginning of period |
11,290
|
10,851
|
9,754
|
| Actual return on plan assets (net of expenses) |
(5)
|
760
|
1,565
|
| Employer contributions |
|
533
|
368
|
| Benefits paid |
866
|
854
|
836
|
| Fair value of plan assets as of end of period |
$ 10,419
|
$ 11,290
|
$ 10,851
|
| Net periodic pension cost: |
|
|
|
| Service cost - benefits earned during the period |
|
|
|
| Interest cost on projected benefit obligation |
$ 518
|
$ 532
|
$ 505
|
| Expected return on plan assets |
(701)
|
(698)
|
(615)
|
| Recognized actuarial loss |
103
|
162
|
495
|
| Net periodic pension cost |
$ (80)
|
$ (4)
|
$ 385
|
| Discount rate |
3.86%
|
4.49%
|
3.89%
|
| Expected return on plan assets |
6.50%
|
6.50%
|
6.50%
|