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Supplemental Compensation Plans, Change in Benefit Obligation, Plan Assets, Funded Status and Amounts Recognized in Balance Sheets (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Amounts recognized in the consolidated balance sheets consist of [Abstract]      
Unrecognized net actuarial loss and prior service cost expected to be recognized in next fiscal year $ 117    
Salary Continuation Plan [Member]      
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 5,322 $ 5,419 $ 4,523
Service cost 213 174 99
Interest cost 221 185 171
Plan loss (gain) 387 (184) 948
Benefits paid (272) (272) (322)
Benefit obligation at end of year 5,871 5,322 5,419
Change in plan assets [Abstract]      
Employer Contribution 272 272 322
Benefits paid (272) (272) (322)
Fair value of plan assets at end of year 0 0 0
Reconciliation of funded status [Abstract]      
Funded status (5,871) (5,322) (5,419)
Unrecognized net plan loss (gain) 1,943 1,643 1,929
Unrecognized prior service cost 37 39 40
Net amount recognized (3,891) (3,640) (3,450)
Amounts recognized in the consolidated balance sheets consist of [Abstract]      
Accrued benefit liability (5,871) (5,322) (5,419)
Accumulated other comprehensive loss (income) 1,980 1,682 1,969
Net amount recognized (3,891) (3,640) (3,450)
Directors' Retirement Plan [Member]      
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 787 856 830
Service cost 2 12 11
Interest cost 28 25 27
Plan loss (gain) 63 (37) 18
Benefits paid (60) (69) (30)
Benefit obligation at end of year 820 787 856
Change in plan assets [Abstract]      
Employer Contribution 60 69 30
Benefits paid (60) (69) (30)
Fair value of plan assets at end of year 0 0 0
Reconciliation of funded status [Abstract]      
Funded status (820) (787) (856)
Unrecognized net plan loss (gain) 22 (40) (4)
Net amount recognized (798) (827) (860)
Amounts recognized in the consolidated balance sheets consist of [Abstract]      
Accrued benefit liability (820) (787) (856)
Accumulated other comprehensive loss (income) 22 (40) (4)
Net amount recognized $ (798) $ (827) $ (860)