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Shareholders' Equity (Tables)
 6 Months Ended
Jun. 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)
 
33,369

 
—

 
33,369

Reclassification adjustments included in earnings:
 
 
 
 
 

Gain on available for sale securities, net
 
(2,429
)
 
—

 
(2,429
)
Other comprehensive income (loss), before income taxes
 
30,940

 
—

 
30,940

Federal and state income taxes1
 
12,009

 
—

 
12,009

Other comprehensive income (loss), net of income taxes
 
18,931

 
—

 
18,931

Balance, June 30, 2017
 
$
9,844

 
$
(1,880
)
 
$
7,964

 
 
 
 
 
 

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)
 
(130,523
)
 
—

 
(130,523
)
Reclassification adjustments included in earnings:
 
 
 
 
 

Loss on available for sale securities, net
 
1,052

 
—

 
1,052

Other comprehensive income (loss), before income taxes
 
(129,471
)
 
—

 
(129,471
)
Federal and state income taxes2
 
(33,049
)
 
—

 
(33,049
)
Other comprehensive income (loss), net of income taxes
 
(96,422
)
 
—

 
(96,422
)
Balance, June 30, 2018
 
$
(134,516
)

$
(789
)
 
$
(135,305
)

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.