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Employee Retirement Plans (Tables)
12 Months Ended
Dec. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Net Funded Status [Table Text Block]

Table 18.1 - Pentegra Defined Benefit Plan Net Pension Cost and Funded Status
(dollars in thousands)

 
For the Year Ended December 31,
 
2019
 
2018
 
2017
Net pension cost
$
6,559

 
$
6,472

 
$
6,727

Pentegra Defined Benefit Plan funded status as of July 1(1)
108.6
%
(2) 
111.0
%
(3) 
111.8
%
Our funded status as of July 1(1)
113.9
%
 
123.1
%
 
122.9
%

______________________
(1)
The funded status is calculated in accordance with a provision contained in the Highway and Transportation Funding Act of 2014 (HATFA), which was signed into law on August 8, 2014, and which modifies the interest rates that had been set by the Moving Ahead for Progress in the 21st Century Act (MAP-21). MAP-21, signed into law in 2012, changed the calculation of the discount rate used in measuring the pension plan liability. MAP-21 allows plan sponsors to measure the pension plan liability using a 25-year average of interest rates plus or minus a corridor. Prior to MAP-21, the discount rate used in measuring the pension plan liability was based on the 24-month average of interest rates. HATFA amended MAP-21 by extending the time period and reducing the rate at which the 25-year corridors widen. Over time, the pension funding stabilization effect of MAP-21 will decline because the 24-month smoothed segment rates and the amended 25-year corridors are likely to converge.
(2)
The funded status as of July 1, 2019, is preliminary and may increase because the plan's participants were permitted to make contributions for the plan year ended June 30, 2019, through March 15, 2020. Contributions made on or before March 15, 2020, and designated for the plan year ended June 30, 2019, will be included in the final valuation as of July 1, 2019. The final funded status as of July 1, 2019, will not be available until the Form 5500 for the plan year July 1, 2019, through June 30, 2020 is filed. This Form 5500 is due to be filed no later than April 2021.
(3)
The funded status as of July 1, 2018, is preliminary and may increase because the plan's participants were permitted to make contributions for the plan year ended June 30, 2018, through March 15, 2019. Contributions made on or before March 15, 2019, and designated for the plan year ended June 30, 2018, will be included in the final valuation as of July 1, 2018. The final funded status as of July 1, 2018, will not be available until the Form 5500 for the plan year July 1, 2018, through June 30, 2019 is filed. This Form 5500 is due to be filed no later than April 2020.

Change in Benefit Obligation [Table Text Block]
Table 18.2 - Pension and Postretirement Benefit Obligation, Fair Value of Plan Assets, and Funded Status
(dollars in thousands)

 
Nonqualified Supplemental Defined Benefit Retirement Plan
 
Postretirement Benefits 
 
December 31, 2019
 
December 31, 2018
 
December 31, 2019
 
December 31, 2018
Change in benefit obligation (1)
 

 
 

 
 

 
 

Benefit obligation at beginning of year
$
22,321

 
$
19,366

 
$
955

 
$
1,056

Service cost
1,235

 
1,490

 
38

 
45

Interest cost
699

 
654

 
42

 
37

Actuarial loss
1,874

 
831

 
321

 
(161
)
Benefits paid
(6
)
 
(5
)
 
(17
)
 
(22
)
Settlements

 
(15
)
 

 

Benefit obligation at end of year
26,123

 
22,321

 
1,339

 
955

 
 
 
 
 
 
 
 
Change in plan assets
 

 
 

 
 

 
 

Fair value of plan assets at beginning of year

 

 

 

Employer contribution
6

 
20

 
17

 
22

Benefits paid
(6
)
 
(5
)
 
(17
)
 
(22
)
Settlements

 
(15
)
 

 

Fair value of plan assets at end of year

 

 

 

Funded status at end of year
$
(26,123
)
 
$
(22,321
)
 
$
(1,339
)
 
$
(955
)
______________________
(1)
Represents the projected benefit obligation for the nonqualified supplemental defined benefit retirement plan and the accumulated postretirement benefit obligation for postretirement benefits.
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]
Table 18.3 - Pension and Postretirement Benefits Recognized in Accumulated Other Comprehensive Loss
(dollars in thousands)

 
 
Nonqualified Supplemental Defined Benefit Retirement Plan
 
Postretirement
Benefits
 
 
December 31, 2019
 
December 31, 2018
 
December 31, 2019
 
December 31, 2018
Net actuarial loss
 
$
6,223

 
$
4,920

 
$
437

 
$
123

Prior service cost
 
148

 
234

 

 

Total
 
$
6,371

 
$
5,154

 
$
437

 
$
123


Net Periodic Benefit Cost [Table Text Block]
Table 18.4 - Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income
(dollars in thousands)

 
 
Nonqualified Supplemental Defined Benefit Retirement Plan
 
Postretirement Benefits
 
 
2019
 
2018
 
2017
 
2019
 
2018
 
2017
Net Periodic Benefit Cost
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
1,235

 
$
1,490

 
$
1,179

 
$
38

 
$
45

 
$
38

Interest cost
 
699

 
654

 
600

 
42

 
37

 
36

Amortization of prior service cost
 
86

 
86

 
86

 

 

 

Amortization of net actuarial loss
 
571

 
1,248

 
676

 
7

 
15

 
8

Net periodic benefit cost
 
2,591

 
3,478

 
2,541

 
87

 
97

 
82

 
 
 
 
 
 
 
 
 
 
 
 
 
Other Changes in Benefit Obligations Recognized in Accumulated Other Comprehensive Loss
 
 
 
 
 
 
 
 
 
 
 
 
Amortization of prior service cost
 
(86
)
 
(86
)
 
(86
)
 

 

 

Amortization of net actuarial loss
 
(571
)
 
(1,248
)
 
(676
)
 
(7
)
 
(15
)
 
(8
)
Net actuarial loss (gain)
 
1,874

 
831

 
459

 
321

 
(161
)
 
127

Total amount recognized in other comprehensive income
 
1,217

 
(503
)
 
(303
)
 
314

 
(176
)
 
119

Total amount recognized in net periodic benefit cost and other comprehensive income
 
$
3,808

 
$
2,975

 
$
2,238

 
$
401

 
$
(79
)
 
$
201


Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Table 18.4 - Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income
(dollars in thousands)

 
 
Nonqualified Supplemental Defined Benefit Retirement Plan
 
Postretirement Benefits
 
 
2019
 
2018
 
2017
 
2019
 
2018
 
2017
Net Periodic Benefit Cost
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
1,235

 
$
1,490

 
$
1,179

 
$
38

 
$
45

 
$
38

Interest cost
 
699

 
654

 
600

 
42

 
37

 
36

Amortization of prior service cost
 
86

 
86

 
86

 

 

 

Amortization of net actuarial loss
 
571

 
1,248

 
676

 
7

 
15

 
8

Net periodic benefit cost
 
2,591

 
3,478

 
2,541

 
87

 
97

 
82

 
 
 
 
 
 
 
 
 
 
 
 
 
Other Changes in Benefit Obligations Recognized in Accumulated Other Comprehensive Loss
 
 
 
 
 
 
 
 
 
 
 
 
Amortization of prior service cost
 
(86
)
 
(86
)
 
(86
)
 

 

 

Amortization of net actuarial loss
 
(571
)
 
(1,248
)
 
(676
)
 
(7
)
 
(15
)
 
(8
)
Net actuarial loss (gain)
 
1,874

 
831

 
459

 
321

 
(161
)
 
127

Total amount recognized in other comprehensive income
 
1,217

 
(503
)
 
(303
)
 
314

 
(176
)
 
119

Total amount recognized in net periodic benefit cost and other comprehensive income
 
$
3,808

 
$
2,975

 
$
2,238

 
$
401

 
$
(79
)
 
$
201


Defined Benefit Plan, Assumptions [Table Text Block]
Table 18.5 - Pension and Postretirement Benefit Plan Key Assumptions

 
 
Nonqualified Supplemental Defined Benefit Retirement Plan
 
Postretirement
Benefits
 
 
2019
 
2018
 
2019
 
2018
Benefit obligation
 
 
 
 
 
 
 
 
Discount rate
 
2.68
%
 
3.81
%
 
3.25
%
 
4.25
%
Salary increases
 
5.50
%
 
5.50
%
 

 

 
 
 
 
 
 
 
 
 
Net periodic benefit cost
 
 
 
 
 
 
 
 
Discount rate
 
3.81
%
 
3.09
%
 
4.25
%
 
3.64
%
Salary increases
 
5.50
%
 
5.50
%
 

 


Schedule of Expected Benefit Payments [Table Text Block]
Table 18.6 - Estimated Future Benefit Payments
(dollars in thousands)

 
 
Estimated Future Payments
 
 
Nonqualified Supplemental Defined Benefit
Retirement Plan
 
Postretirement
Benefits
2020
 
$
6,066

 
$
18

2021
 
2,459

 
19

2022
 
1,900

 
21

2023
 
2,464

 
23

2024
 
4,083

 
26

2025-2029
 
9,268

 
168