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Shareholders' Equity
 3 Months Ended
Mar. 31, 2018
Stockholders' Equity Note [Abstract]  
Shareholders' Equity [Text Block]
Shareholders' Equity

On April 24, 2018, the Company declared a quarterly cash dividend of $0.45 per common share payable on or about May 25, 2018 to shareholders of record as of May 11, 2018.

Dividends declared were $0.45 per share during the three months ended March 31, 2018 and $0.44 per share during the three months ended March 31, 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)
 
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.
2 
Calculated using a 25 percent effective tax rate.