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Note 12 - Pension and Other Postretirement Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
    Net Actuarial
Loss (Gain)
  Prior Service
Cost (Credit)
  Total
    2017   2016   2015   2017   2016   2015   2017   2016   2015
    (In thousands)
Employee Retirement Plan   $
6,166
    $
8,055
    $
8,589
    $
-
    $
-
    $
-
    $
6,166
    $
8,055
    $
8,589
 
Other Postretirement Benefit Plans    
1,223
     
636
     
1,296
     
(368
)    
(453
)    
(538
)    
855
     
183
     
758
 
Outside Directors Plan    
(472
)    
(540
)    
(562
)    
12
     
52
     
91
     
(460
)    
(488
)    
(471
)
Total   $
6,917
    $
8,151
    $
9,323
    $
(356
)   $
(401
)   $
(447
)   $
6,561
    $
7,750
    $
8,876
 
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]
    Net Actuarial
Loss (Gain)
  Prior Service
Cost (Credit)
  Expense
(Benefit)
    (In thousands)
Employee Retirement Plan   $
621
    $
-
    $
621
 
Other Postretirement Benefit Plans    
33
     
(85
)    
(52
)
Outside Directors Plan    
(91
)    
12
     
(79
)
Total   $
563
    $
(73
)   $
490
 
Schedule of Assumptions Used [Table Text Block]
    2017   2016
         
Discount rate    
3.42
%    
3.88
%
Rate of increase in health care costs                
Initial    
7.00
%    
8.00
%
Ultimate (year 2023)    
5.00
%    
5.00
%
Annual rate of salary increase for life insurance    
n/a
     
n/a
 
Schedule of Net Benefit Costs [Table Text Block]
    2017   2016   2015
    (In thousands)
Service cost   $
316
    $
359
    $
382
 
Interest cost    
305
     
320
     
300
 
Amortization of unrecognized loss    
-
     
47
     
119
 
Amortization of past service credit    
(85
)    
(85
)    
(85
)
Net postretirement benefit expense    
536
     
641
     
716
 
                         
Current year actuarial loss (gain)    
587
     
(613
)    
(715
)
Amortization of actuarial loss    
-
     
(47
)    
(119
)
Amortization of prior service credit    
85
     
85
     
85
 
Total recognized in other comprehensive income    
672
     
(575
)    
(749
)
Total recognized in net postretirement expense and other comprehensive loss   $
1,208
    $
66
    $
(33
)
Schedule of Allocation of Plan Assets [Table Text Block]
    2017   2016
Equity securities    
72
%    
69
%
Debt securities    
28
%    
31
%
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
    At December 31,
    2017   2016
    (In thousands)
Pooled Separate Accounts                
U.S. large-cap growth (a)   $
5,822
    $
4,702
 
U.S. large-cap value (b)    
5,164
     
4,789
 
U.S. small-cap blend (c)    
2,735
     
2,362
 
International blend (d)    
2,566
     
2,017
 
Bond fund (e)    
6,338
     
5,950
 
Prudential short term (f)    
77
     
326
 
                 
Total   $
22,702
    $
20,146
 
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
    Increase   Decrease
    (In thousands)
Effect on postretirement benefit obligation   $
1,949
    $
(1,481
)
Effect on total service and interest cost    
175
     
(130
)
Schedule of Employee Benefit Trust Shares [Table Text Block]
    2017   2016
         
Shares owned by Employee Benefit Trust, beginning balance    
551,762
     
675,436
 
Shares purchased    
11,631
     
18,391
 
Shares released and allocated    
(118,371
)    
(142,065
)
Shares owned by Employee Benefit Trust, ending balance    
445,022
     
551,762
 
                 
Market value of unallocated shares   $
12,238,105
    $
16,216,285
 
Directors' Plan [Member]  
Notes Tables  
Schedule of Net Funded Status [Table Text Block]
    2017   2016
    (In thousands)
Change in benefit obligation:                
Projected benefit obligation at beginning of year   $
2,462
    $
2,530
 
Service cost    
42
     
42
 
Interest cost    
89
     
97
 
Actuarial gain    
(24
)    
(63
)
Benefits paid    
(144
)    
(144
)
Projected benefit obligation at end of year    
2,425
     
2,462
 
                 
Change in plan assets:                
Market value of assets at beginning of year    
-
     
-
 
Employer contributions    
144
     
144
 
Benefits paid    
(144
)    
(144
)
Market value of plan assets at end of year    
-
     
-
 
                 
Accrued pension cost included in other liabilities   $
(2,425
)   $
(2,462
)
Schedule of Net Benefit Costs [Table Text Block]
    2017   2016   2015
    (In thousands)
Service cost   $
42
    $
42
    $
45
 
Interest cost    
89
     
97
     
95
 
Amortization of unrecognized gain    
(92
)    
(86
)    
(56
)
Amortization of past service liability    
40
     
40
     
40
 
Net pension expense    
79
     
93
     
124
 
                         
Current actuarial gain    
(24
)    
(63
)    
(130
)
Amortization of actuarial gain    
92
     
86
     
56
 
Amortization of prior service cost    
(40
)    
(40
)    
(40
)
Total recognized in other comprehensive income    
28
     
(17
)    
(114
)
Total recognized in net pension expense and other comprehensive income   $
107
    $
76
    $
10
 
Schedule of Expected Benefit Payments [Table Text Block]
For the years ending December 31:   Future Benefit
Payments
    (In thousands)
2018   $
248
 
2019    
288
 
2020    
288
 
2021    
288
 
2022    
288
 
2023 – 2027    
1,052
 
Assumptions Used to Determine Benefit Obligations and Periodic Pension Expense for the Directors' Plan [Member]  
Notes Tables  
Schedule of Assumptions Used [Table Text Block]
    2017   2016   2015
Weighted average discount rate for the benefit obligation    
3.42
%    
3.88
%    
4.06
%
Weighted average discount rate for periodic pension benefit expense    
3.88
%    
4.06
%    
3.76
%
Rate of increase in future compensation levels    
n/a
     
n/a
     
n/a
 
Other Postretirement Benefits Plan [Member]  
Notes Tables  
Schedule of Net Funded Status [Table Text Block]
    2017   2016
    (In thousands)
Change in benefit obligation:                
Projected benefit obligation at beginning of year   $
7,978
    $
7,977
 
Service cost    
316
     
359
 
Interest cost    
305
     
320
 
Actuarial loss (gain)    
588
     
(613
)
Benefits paid    
(83
)    
(65
)
Projected benefit obligation at end of year    
9,104
     
7,978
 
                 
Change in plan assets:                
Market value of assets at beginning of year    
-
     
-
 
Employer contributions    
83
     
65
 
Benefits paid    
(83
)    
(65
)
Market value of plan assets at end of year    
-
     
-
 
                 
Accrued pension cost included in other liabilities   $
(9,104
)   $
(7,978
)
Schedule of Assumptions Used [Table Text Block]
    2017   2016   2015
Rate of return on plan assets    
n/a
     
n/a
     
n/a
 
Discount rate    
3.88
%    
4.06
%    
3.76
%
Rate of increase in health care costs                        
Initial    
8.00
%    
7.00
%    
8.00
%
Ultimate (year 2023)    
5.00
%    
5.00
%    
5.00
%
Annual rate of salary increase for life insurance    
n/a
     
n/a
     
n/a
 
Schedule of Expected Benefit Payments [Table Text Block]
For the years ending December 31:   Future Benefit
Payments
    (In thousands)
2018   $
236
 
2019    
251
 
2020    
256
 
2021    
270
 
2022    
294
 
2023 – 2027    
1,561
 
Retirement Plan [Member]  
Notes Tables  
Schedule of Net Funded Status [Table Text Block]
    2017   2016
    (In thousands)
Change in benefit obligation:                
Projected benefit obligation at beginning of year   $
22,769
    $
22,764
 
Interest cost    
864
     
902
 
Actuarial loss    
962
     
130
 
Benefits paid    
(990
)    
(1,027
)
Projected benefit obligation at end of year    
23,605
     
22,769
 
                 
Change in plan assets:                
Market value of assets at beginning of year    
20,146
     
19,924
 
Actual return on plan assets    
3,546
     
1,249
 
Benefits paid    
(990
)    
(1,027
)
Market value of plan assets at end of year    
22,702
     
20,146
 
                 
Accrued pension liability included in other liabilities   $
(903
)   $
(2,623
)
Schedule of Net Benefit Costs [Table Text Block]
    2017   2016   2015
    (In thousands)
Interest cost   $
864
    $
902
    $
889
 
Amortization of unrecognized loss    
697
     
809
     
1,112
 
Expected return on plan assets    
(1,392
)    
(1,394
)    
(1,400
)
Net pension expense    
169
     
317
     
601
 
                         
Current year actuarial (gain) loss    
(1,192
)    
275
     
(237
)
Amortization of actuarial loss    
(697
)    
(809
)    
(1,112
)
Total recognized in other comprehensive income    
(1,889
)    
(534
)    
(1,349
)
Total recognized in net pension cost (benefit) and other comprehensive loss   $
(1,720
)   $
(217
)   $
(748
)
Schedule of Expected Benefit Payments [Table Text Block]
For the years ending December 31:   Future Benefit
Payments
    (In thousands)
2018   $
1,421
 
2019    
1,202
 
2020    
1,199
 
2021    
1,238
 
2022    
1,306
 
2023 – 2027    
6,490
 
Assumptions for Periodic Pension Benefit for the Retirement Plan [Member]  
Notes Tables  
Schedule of Assumptions Used [Table Text Block]
    2017   2016   2015
Weighted average discount rate    
3.88
%    
4.06
%    
3.76
%
Rate of increase in future compensation levels    
n/a
     
n/a
     
n/a
 
Expected long-term rate of return on assets    
7.00
%    
7.25
%    
7.50
%
Assumptions for the Retirement Plan's Benefit Obligations [Member]  
Notes Tables  
Schedule of Assumptions Used [Table Text Block]
    2017   2016
Weighted average discount rate    
3.42
%    
3.88
%
Rate of increase in future compensation levels    
n/a
     
n/a