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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2020
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, 2018
 
$
(70,999
)
 
$
(1,586
)
 
$
(72,585
)
Net change in unrealized gain (loss)
 
92,739

 
—

 
92,739

Reclassification adjustments included in earnings:
 
 
 
 
 

Gain on available for sale securities, net
 
(76
)
 
—

 
(76
)
Other comprehensive income, before income taxes
 
92,663

 
—

 
92,663

Federal and state income taxes1
 
23,609

 
—

 
23,609

Other comprehensive income, net of income taxes
 
69,054

 
—

 
69,054

Balance, March 31, 2019
 
$
(1,945
)
 
$
(1,586
)
 
$
(3,531
)
 
 
 
 
 
 

Balance, December 31, 2019
 
$
104,996

 
$
(73
)
 
$
104,923

Net change in unrealized gain (loss)
 
297,843

 
—

 
297,843

Reclassification adjustments included in earnings:
 
 
 
 
 

Gain on available for sale securities, net
 
(3
)
 
—

 
(3
)
Other comprehensive income, before income taxes
 
297,840

 
—

 
297,840

Federal and state income taxes1
 
71,471

 
—

 
71,471

Other comprehensive income, net of income taxes
 
226,369

 
—

 
226,369

Balance, March 31, 2020
 
$
331,365


$
(73
)
 
$
331,292


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