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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 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)
 
11,411

 
—

 
11,411

Reclassification adjustments included in earnings:
 
 
 
 
 

Gain on available for sale securities, net
 
(2,049
)
 
—

 
(2,049
)
Other comprehensive income (loss), before income taxes
 
9,362

 
—

 
9,362

Federal and state income taxes1
 
3,616

 
—

 
3,616

Other comprehensive income (loss), net of income taxes
 
5,746

 
—

 
5,746

Balance, March 31, 2017
 
$
(3,341
)
 
$
(1,880
)
 
$
(5,221
)
 
 
 
 
 
 

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)
 
(97,406
)
 
—

 
(97,406
)
Reclassification adjustments included in earnings:
 
 
 
 
 

Loss on available for sale securities, net
 
290

 
—

 
290

Other comprehensive income (loss), before income taxes
 
(97,116
)
 
—

 
(97,116
)
Federal and state income taxes2
 
(24,808
)
 
—

 
(24,808
)
Other comprehensive income (loss), net of income taxes
 
(72,308
)
 
—

 
(72,308
)
Balance, March 31, 2018
 
$
(110,402
)

$
(789
)
 
$
(111,191
)

1 
Calculated using a 39 percent effective tax rate.