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Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2018
Other Comprehensive Income (Loss) [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Other comprehensive income (loss) components, net of income tax, are shown in the following table for the years ended December 31, 2018, 2017 and 2016.

Year ended December 31,
(in thousands)
 
Changes in Pension Plan assets and benefit obligations
 
Unrealized gains and losses on AFS debt securities
 
Total
Beginning balance at January 1, 2018, as previously presented
 
$
(23,526
)
 
$
(2,928
)
 
$
(26,454
)
 
Cumulative effect of change in accounting principle for marketable equity securities, net of tax
 
—

 
(995
)
 
(995
)
Beginning balance at January 1, 2018, as adjusted
 
(23,526
)
 
(3,923
)
 
(27,449
)
 
Reclassification of disproportionate income tax effects
 
(3,175
)
 
(631
)
 
(3,806
)
Net current period activity
 
 
 
 
 
 
 
Other comprehensive loss before reclassifications
 
(4,046
)
 
(17,586
)
 
(21,632
)
 
Amounts reclassified from accumulated other comprehensive loss
 
1,075

 
2,024

 
3,099

Net current period other comprehensive loss
 
(2,971
)
 
(15,562
)
 
(18,533
)
Ending balance at December 31, 2018
 
$
(29,672
)
 
$
(20,116
)
 
$
(49,788
)
 
 
 
 
 
 
 
Beginning balance at January 1, 2017
 
$
(14,740
)
 
$
(3,005
)
 
$
(17,745
)
 
Other comprehensive (loss) gain before reclassifications
 
(9,241
)
 
1,261

 
(7,980
)
 
Amounts reclassified from accumulated other comprehensive loss
 
455

 
(1,184
)
 
(729
)
Net current period other comprehensive (loss) income
 
(8,786
)
 
77

 
(8,709
)
Ending balance at December 31, 2017
 
$
(23,526
)
 
$
(2,928
)
 
$
(26,454
)
 
 
 
 
 
 
 
 
Beginning balance at January 1, 2016
 
$
(15,351
)
 
$
(292
)
 
$
(15,643
)
 
Other comprehensive gain (loss) before reclassifications
 
109

 
(2,713
)
 
(2,604
)
 
Amounts reclassified from accumulated other comprehensive loss
 
502

 
—

 
502

Net current period other comprehensive income (loss)
 
611


(2,713
)
 
(2,102
)
Ending balance at December 31, 2016
 
$
(14,740
)
 
$
(3,005
)
 
$
(17,745
)
Schedule of components of other comprehensive income (loss)
The following table provides information concerning amounts reclassified out of accumulated other comprehensive loss for the years ended December 31, 2018, 2017 and 2016:


 
Amount Reclassified from Accumulated Other Comprehensive Loss
 
Affected Line Item in the Consolidated Statements of Income
(In thousands)
 
2018
2017
2016
 
 
Amortization of defined benefit pension items
 
 
 
 
 
 
 
Amortization of net loss
 
1,361

576

773

 
Employee benefits
   Income before income taxes
 
1,361

576

773

 
Income before income taxes
 
Income taxes
 
286

121

271

 
Income taxes
 
   Net of income tax
 
$
1,075

$
455

$
502

 
Net income
 
 
 
 
 
 
 
 
Unrealized gains & losses on available for sale securities
 
 
 
 
 
 
 
Loss (gain) on the sale of investment securities
 
$
2,562

$
(1,821
)
$
—

 
Net (loss) gain on the sale of investment securities
   Income before income taxes
 
2,562

(1,821
)
—

 
Income before income taxes
 
Income taxes
 
538

(637
)
—

 
Income taxes
 
  Net of income tax
 
$
2,024

$
(1,184
)
$
—

 
Net income