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Note 12 - Pension and Other Postretirement Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2015
Note 12 - Pension and Other Postretirement Benefit Plans (Tables) [Line Items]  
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
    Net Actuarial
loss (gain)
  Prior Service
cost (credit)
  Total
    2015   2014   2013   2015   2014   2013   2015   2014   2013
    (In thousands)
Employee Retirement Plan   $ 8,589     $ 9,938     $ 5,899     $ -     $ -     $ -     $ 8,589     $ 9,938     $ 5,899  
Other Postretirement Benefit Plans     1,296       2,130       205       (538 )     (623 )     (708 )     758       1,507       (503 )
Outside Directors Plan     (562 )     (488 )     (496 )     91       131       171       (471 )     (357 )     (325 )
Total   $ 9,323     $ 11,580     $ 5,608     $ (447 )   $ (492 )   $ (537 )   $ 8,876     $ 11,088     $ 5,071  
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)
  Total
    (In thousands)
Employee Retirement Plan   $ 808     $ -     $ 808  
Other Postretirement Benefit Plans     47       (85 )     (38 )
Outside Directors Plan     (86 )     40       (46 )
Total   $ 769     $ (45 )   $ 724  
Schedule of Assumptions Used [Table Text Block]
    2015   2014
Rate of return on plan assets     n/a       n/a  
Discount rate     4.06 %     3.76 %
Rate of increase in health care costs                
Initial     7.00 %     8.00 %
Ultimate (year 2018)     5.00 %     5.00 %
Annual rate of salary increase for life insurance     n/a       n/a  
Schedule of Net Benefit Costs [Table Text Block]
    2015   2014   2013
    (In thousands)
Service cost   $ 382     $ 358     $ 449  
Interest cost     300       253       219  
Amortization of unrecognized loss     119       -       50  
Amortization of past service credit     (85 )     (85 )     (85 )
Net postretirement benefit expense     716       526       633  
                         
Current year actuarial (gain) loss     (715 )     1,925       (943 )
Amortization of actuarial loss     (119 )     -       (50 )
Amortization of prior service credit     85       85       85  
Total recognized in other comprehensive income     (749 )     2,010       (908 )
Total recognized in net postretirement expense and other comprehensive income   $ (33 )   $ 2,536     $ (275 )
Schedule of Allocation of Plan Assets [Table Text Block]
    2015   2014
Equity securities     70 %     68 %
Debt securities     30 %     32 %
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
December 31, 2015       Quoted Prices
in Active
Markets for
Identical Assets
  Significant
Other
Observable
Inputs
  Significant
Other
Unobservable
Inputs
    Total   Level 1   Level 2   Level 3
    (In thousands)
Pooled Separate Accounts                                
U.S. large-cap growth (a)   $ 5,114     $ -     $ 5,114     $ -  
U.S. large-cap value (b)     4,619       -       4,619       -  
U.S. small-cap blend (c)     2,094       -       2,094       -  
International blend (d)     2,079       -       2,079       -  
Bond fund (e)     5,671       -       5,671       -  
Prudential short term (f)     347       -       347       -  
                                 
Total   $ 19,924     $ -     $ 19,924     $ -  
December 31, 2014       Quoted Prices
in Active
Markets for
Identical Assets
  Significant
Other
Observable
Inputs
  Significant
Other
Unobservable
Inputs
    Total   Level 1   Level 2   Level 3
    (In thousands)
Pooled Separate Accounts                                
U.S. large-cap growth (a)   $ 4,832     $ -     $ 4,832     $ -  
U.S. large-cap value (b)     4,939       -       4,939       -  
U.S. small-cap blend (c)     2,163       -       2,163       -  
International blend (d)     1,966       -       1,966       -  
Bond fund (e)     6,274       -       6,274       -  
Prudential short term (f)     335       -       335       -  
                                 
Total   $ 20,509     $ -     $ 20,509     $ -  
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   $ 1,634     $ (1,240 )
Effect on total service and interest cost     177       (131 )
Schedule of Employee Benefit Trust Shares [Table Text Block]
    2015   2014
         
Shares owned by Employee Benefit Trust, beginning balance     800,950       913,792  
Shares purchased     22,102       23,717  
Shares released and allocated     (147,616 )     (136,559 )
Shares owned by Employee Benefit Trust, ending balance     675,436       800,950  
                 
Market value of unallocated shares.   $ 14,616,435     $ 16,235,257  
Retirement Plan [Member]  
Note 12 - Pension and Other Postretirement Benefit Plans (Tables) [Line Items]  
Schedule of Net Funded Status [Table Text Block]
    2015   2014
    (In thousands)
Change in benefit obligation:                
Projected benefit obligation at beginning of year   $ 24,097     $ 19,740  
Interest cost     889       891  
Actuarial (gain) loss     (1,208 )     4,446  
Benefits paid     (1,014 )     (980 )
Projected benefit obligation at end of year     22,764       24,097  
                 
Change in plan assets:                
Market value of assets at beginning of year     20,509       20,496  
Actual return on plan assets     429       993  
Benefits paid     (1,014 )     (980 )
Market value of plan assets at end of year     19,924       20,509  
                 
Accrued pension liability included in other liabilities   $ (2,840 )   $ (3,588 )
Schedule of Net Benefit Costs [Table Text Block]
    2015   2014   2013
    (In thousands)
Interest cost   $ 889     $ 891     $ 827  
Amortization of unrecognized loss     1,112       759       1,222  
Expected return on plan assets     (1,400 )     (1,344 )     (1,261 )
Net pension expense (benefit)     601       306       788  
                         
Current year actuarial (gain) loss     (237 )     4,798       (4,722 )
Amortization of actuarial loss     (1,112 )     (759 )     (1,222 )
Total recognized in other comprehensive income     (1,349 )     4,039       (5,944 )
Total recognized in net pension cost (benefit) and other comprehensive income   $ (748 )   $ 4,345     $ (5,156 )
Schedule of Expected Benefit Payments [Table Text Block]
For the years ending December 31:   Future Benefit
Payments
    (In thousands)
2016   $ 1,172  
2017     1,184  
2018     1,177  
2019     1,192  
2020     1,193  
2021 – 2025     6,502  
Assumptions for the Retirement Plan's Benefit Obligations [Member]  
Note 12 - Pension and Other Postretirement Benefit Plans (Tables) [Line Items]  
Schedule of Assumptions Used [Table Text Block]
    2015   2014
Weighted average discount rate     4.06 %     3.76 %
Rate of increase in future compensation levels     n/a       n/a  
Expected long-term rate of return on assets     7.25 %     7.50 %
Assumptions for Periodic Pension Benefit for the Retirement Plan [Member]  
Note 12 - Pension and Other Postretirement Benefit Plans (Tables) [Line Items]  
Schedule of Assumptions Used [Table Text Block]
    2015   2014   2013
Weighted average discount rate     3.76 %     4.60 %     3.75 %
Rate of increase in future compensation levels     n/a       n/a       n/a  
Expected long-term rate of return on assets     7.50 %     7.50 %     7.50 %
Postretirement Plans [Member]  
Note 12 - Pension and Other Postretirement Benefit Plans (Tables) [Line Items]  
Schedule of Net Funded Status [Table Text Block]
    2015   2014
    (In thousands)
Change in benefit obligation:                
Projected benefit obligation at beginning of year   $ 8,073     $ 5,586  
Service cost     382       358  
Interest cost     300       253  
Actuarial loss (gain)     (715 )     1,925  
Benefits paid     (63 )     (49 )
Projected benefit obligation at end of year     7,977       8,073  
                 
Change in plan assets:                
Market value of assets at beginning of year     -       -  
Employer contributions     63       49  
Benefits paid     (63 )     (49 )
Market value of plan assets at end of year     -       -  
                 
Accrued pension cost included in other liabilities   $ (7,977 )   $ (8,073 )
Schedule of Assumptions Used [Table Text Block]
    2015   2014   2013
Rate of return on plan assets     n/a       n/a       n/a  
Discount rate     3.76 %     4.60 %     3.75 %
Rate of increase in health care costs                        
Initial     8.00 %     9.00 %     10.00 %
Ultimate (year 2018)     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)
2016   $ 189  
2017     229  
2018     255  
2019     280  
2020     263  
2021 – 2025     1,524  
Directors' Plan [Member]  
Note 12 - Pension and Other Postretirement Benefit Plans (Tables) [Line Items]  
Schedule of Net Funded Status [Table Text Block]
    2015   2014
    (In thousands)
Change in benefit obligation:                
Projected benefit obligation at beginning of year   $ 2,663     $ 2,666  
Service cost     45       54  
Interest cost     95       116  
Actuarial gain     (129 )     (53 )
Benefits paid     (144 )     (120 )
Projected benefit obligation at end of year     2,530       2,663  
                 
Change in plan assets:                
Market value of assets at beginning of year     -       -  
Employer contributions     144       120  
Benefits paid     (144 )     (120 )
Market value of plan assets at end of year     -       -  
                 
Accrued pension cost included in other liabilities   $ (2,530 )   $ (2,663 )
Schedule of Net Benefit Costs [Table Text Block]
    2015   2014   2013
    (In thousands)
Service cost   $ 45     $ 54     $ 82  
Interest cost     95       116       98  
Amortization of unrecognized gain     (56 )     (60 )     (36 )
Amortization of past service liability     40       40       40  
Net pension expense     124       150       184  
                         
Current actuarial gain     (130 )     (52 )     (122 )
Amortization of actuarial gain     56       60       36  
Amortization of prior service cost     (40 )     (40 )     (40 )
Total recognized in other comprehensive income     (114 )     (32 )     (126 )
Total recognized in net pension expense and other comprehensive income   $ 10     $ 118     $ 58  
Schedule of Expected Benefit Payments [Table Text Block]
For the years ending December 31:   Future Benefit
Payments
    (In thousands)
2016   $ 288  
2017     288  
2018     272  
2019     288  
2020     288  
2021 – 2025     1,244  
Assumptions Used to Determine Benefit Obligations and Periodic Pension Expense for the Directors' Plan [Member]  
Note 12 - Pension and Other Postretirement Benefit Plans (Tables) [Line Items]  
Schedule of Assumptions Used [Table Text Block]
    2015   2014   2013
Weighted average discount rate for the benefit obligation     4.06 %     3.76 %     4.60 %
Weighted average discount rate for periodic pension benefit expense     3.76 %     4.60 %     3.75 %
Rate of increase in future compensation levels     n/a       n/a       n/a