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

On July 24, 2018, the Company declared a quarterly cash dividend of $0.50 per common share payable on or about August 27, 2018 to shareholders of record as of August 13, 2018.

Dividends declared were $0.45 and $0.90 per share during the three and six months ended June 30, 2018 and $0.44 and $0.88 per share during the three and six months ended June 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)
 
33,369

 
—

 
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.