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Shareholders' Equity
 9 Months Ended
Sep. 30, 2018
Stockholders' Equity Note [Abstract]  
Shareholders' Equity [Text Block] Shareholders' Equity

On October 30, 2018, the Company declared a quarterly cash dividend of $0.50 per common share payable on or about November 26, 2018 to shareholders of record as of November 12, 2018.

Dividends declared were $0.50 and $1.40 per share during the three and nine months ended September 30, 2018 and $0.44 and $1.32 per share during the three and nine months ended September 30, 2017.

Accumulated Other Comprehensive Income (Loss)

AOCI includes unrealized gains and losses on available for sale ("AFS") securities and non-credit related unrealized losses on AFS securities for which an other-than-temporary impairment has been recorded in earnings. Unrealized losses on employee benefit plans will be reclassified into income as pension plan costs are recognized over the remaining service period of plan participants. Gains and losses in AOCI are net of deferred income taxes.

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.