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Accumulated Other Comprehensive (Loss) Income (Tables)
 6 Months Ended
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated Other Comprehensive (Loss) Income (in thousands)
 
Net unrealized gains (losses) on available-for-sale securities
 
Pension and postretirement benefits
 
Total accumulated other comprehensive (loss) income
BALANCE, MARCH 31, 2016
$
225

 
$
(12,886
)
 
$
(12,661
)
Other comprehensive income before reclassification:
 
 
 
 
 
Net unrealized losses
(158
)
 
—

 
(158
)
Reclassifications from other comprehensive income to net income:
 
 
 
 
 
Amortization - pension and postretirement benefits
—

 
709

 
709

Net current period other comprehensive (loss) income
(158
)
 
709

 
551

BALANCE, JUNE 30, 2016
$
67

 
$
(12,177
)
 
$
(12,110
)
 
 
 
 
 
 
 
 
 
 
 
 
BALANCE, MARCH 31, 2017
$
(3
)
 
$
(12,937
)
 
$
(12,940
)
Other comprehensive income before reclassification:
 
 
 
 
 
Net unrealized gains
7

 
—

 
7

Reclassifications from other comprehensive income to net income:
 
 
 
 
 
Amortization - pension and postretirement benefits
—

 
511

 
511

Net current period other comprehensive income
7

 
511

 
518

BALANCE, JUNE 30, 2017
$
4

 
$
(12,426
)
 
$
(12,422
)
 
Net unrealized gains (losses) on available-for-sale securities
 
Pension and postretirement benefits
 
Total accumulated other comprehensive (loss) income
BALANCE, DECEMBER 31, 2015
$
81

 
$
(13,358
)
 
$
(13,277
)
Other comprehensive income before reclassification:
 
 
 
 
 
Net unrealized losses
(14
)
 
—

 
(14
)
Reclassifications from other comprehensive income to net income:
 
 
 
 
 
Amortization - pension and postretirement benefits
—

 
1,181

 
1,181

Net current period other comprehensive (loss) income
(14
)
 
1,181

 
1,167

BALANCE, JUNE 30, 2016
$
67

 
$
(12,177
)
 
$
(12,110
)
 
 
 
 
 
 
 
 
 
 
 
 
BALANCE, DECEMBER 31, 2016
$
23

 
$
(13,279
)
 
$
(13,256
)
Other comprehensive income before reclassification:
 
 
 
 
 
Net unrealized losses
(19
)
 
—

 
(19
)
Reclassifications from other comprehensive income to net income:
 
 
 
 
 
Amortization - pension and postretirement benefits
—

 
853

 
853

Net current period other comprehensive (loss) income
(19
)
 
853

 
834

BALANCE, JUNE 30, 2017
$
4

 
$
(12,426
)
 
$
(12,422
)