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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2018
Stockholders' Equity Note [Abstract]  
Accumulated Other Comprehensive Income (Loss) [Table Text Block] A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands):
 
 
Unrealized Gain (Loss) on
 
 
 
 
Available for Sale Securities
 
Employee Benefit Plans
 
Total
Balance, December 31, 2016
 
$
(9,087
)
 
$
(1,880
)
 
$
(10,967
)
Net change in unrealized gain (loss)
 
33,876

 
5

 
33,881

Reclassification adjustments included in earnings:
 
 
 
 
 

Gain on available for sale securities, net
 
(4,916
)
 
—

 
(4,916
)
Other comprehensive income (loss), before income taxes
 
28,960

 
5

 
28,965

Federal and state income taxes1
 
11,239

 
2

 
11,241

Other comprehensive income (loss), net of income taxes
 
17,721

 
3

 
17,724

Balance, September 30, 2017
 
$
8,634

 
$
(1,877
)
 
$
6,757

 
 
 
 
 
 

Balance, December 31, 2017
 
$
(35,385
)
 
$
(789
)
 
$
(36,174
)
Transition adjustment for net unrealized gains on equity securities
 
(2,709
)
 
—

 
(2,709
)
Net change in unrealized gain (loss)
 
(166,464
)
 
—

 
(166,464
)
Reclassification adjustments included in earnings:
 
 
 
 
 

Loss on available for sale securities, net
 
802

 
—

 
802

Other comprehensive income (loss), before income taxes
 
(165,662
)
 
—

 
(165,662
)
Federal and state income taxes2
 
(42,183
)
 
—

 
(42,183
)
Other comprehensive income (loss), net of income taxes
 
(123,479
)
 
—

 
(123,479
)
Balance, September 30, 2018
 
$
(161,573
)

$
(789
)
 
$
(162,362
)

1 
Calculated using a 39 percent blended federal and state statutory tax rate.
2 
Calculated using a 25 percent blended federal and state statutory tax rate.