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Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following is changes in accumulated other comprehensive income (loss) by component, net of tax, for the three and nine months ending September 30, 2019 and 2018.
 
 
For the Three Months Ended September 30, 2019
Dollars in thousands
 
Gains and Losses on Pension Plan
 
Gains and Losses on Other Post-Retirement Benefits
 
Gains and Losses on Cash Flow Hedges
 
Unrealized Gains (Losses) on Available-for-Sale Securities
 
Total
Beginning balance
 
$
(328
)
 
$
139

 
$
(737
)
 
$
3,147

 
$
2,221

Other comprehensive income (loss) before reclassification
 
—

 
—

 
53

 
1,916

 
1,969

Amounts reclassified from accumulated other comprehensive income
 
—

 
—

 
—

 
(344
)
 
(344
)
Net current period other comprehensive income (loss)
 
—

 
—

 
53

 
1,572

 
1,625

Ending balance
 
$
(328
)
 
$
139

 
$
(684
)
 
$
4,719

 
$
3,846


 
 
For the Three Months Ended September 30, 2018
Dollars in thousands
 
Gains and Losses on Other Post-Retirement Benefits
 
Gains and Losses on Cash Flow Hedges
 
Unrealized Gains (Losses) on Available-for-Sale Securities
 
Total
Beginning balance
 
$
398

 
$
(472
)
 
$
(912
)
 
$
(986
)
Other comprehensive (loss) income before reclassification
 
—

 
255

 
(2,168
)
 
(1,913
)
Amounts reclassified from accumulated other comprehensive income
 
—

 
—

 
(6
)
 
(6
)
Net current period other comprehensive (loss) income
 
—

 
255

 
(2,174
)
 
(1,919
)
Ending balance
 
$
398

 
$
(217
)
 
$
(3,086
)
 
$
(2,905
)

 
 
For the Nine Months Ended September 30, 2019
Dollars in thousands
 
Gains and Losses on Pension Plan
 
Gains and Losses on Other Post-Retirement Benefits
 
Gains and Losses on Cash Flow Hedges
 
Unrealized Gains (Losses) on Available-for-Sale Securities
 
Total
Beginning balance
 
$
—

 
$
139

 
$
(314
)
 
$
(841
)
 
$
(1,016
)
Other comprehensive income (loss) before reclassification
 
(328
)
 
—

 
(370
)
 
6,727

 
6,029

Amounts reclassified from accumulated other comprehensive income
 
—

 
—

 
—

 
(1,167
)
 
(1,167
)
Net current period other comprehensive income (loss)
 
(328
)
 
—

 
(370
)
 
5,560

 
4,862

Ending balance
 
$
(328
)
 
$
139

 
$
(684
)
 
$
4,719

 
$
3,846

 
 
For the Nine Months Ended September 30, 2018
Dollars in thousands
 
Gains and Losses on Other Post-Retirement Benefits
 
Gains and Losses on Cash Flow Hedges
 
Unrealized Gains (Losses) on Available-for-Sale Securities
 
Total
Beginning balance
 
$
398

 
$
(1,564
)
 
$
2,898

 
$
1,732

Other comprehensive (loss) income before reclassification
 
—

 
1,347

 
(5,355
)
 
(4,008
)
Amounts reclassified from accumulated other comprehensive income
 
—

 
—

 
(629
)
 
(629
)
Net current period other comprehensive (loss) income
 
—

 
1,347

 
(5,984
)
 
(4,637
)
Ending balance
 
$
398

 
$
(217
)
 
$
(3,086
)
 
$
(2,905
)