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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Summary of activity in accumulated other comprehensive income (loss)
The following table summarizes the components of accumulated other comprehensive income (loss) at December 31, 2015, 2014, and 2013, changes during the years then ended, and reclassifications out of accumulated other comprehensive income (loss) during the years ended December 31, 2015, 2014, and 2013, respectively.
 
Investments
Securities
Available
For Sale
 
Defined Benefit
Pension and
Post Retirement
Obligations
 
Accumulated
Other
Comprehensive
Income (Loss)
Balance December 31, 2012
$
86,109

 
$
(37,506
)
 
$
48,603

Other comprehensive income (loss) before reclassifications
(158,207
)
 
35,804

 
(122,403
)
Amounts reclassified from accumulated other comprehensive income (loss):


 


 


Investment securities gain, net
(564
)
 
—

 
(564
)
Personnel expense
—

 
4,416

 
4,416

Income tax (expense) benefit
61,266

 
(15,562
)
 
45,704

Net other comprehensive income (loss) during period
(97,505
)
 
24,658

 
(72,847
)
Balance December 31, 2013
$
(11,396
)
 
$
(12,848
)
 
$
(24,244
)
Other comprehensive income (loss) before reclassifications
49,038

 
(18,428
)
 
30,610

Amounts reclassified from accumulated other comprehensive income (loss):


 


 


Investment securities gain, net
(494
)
 
—

 
(494
)
Personnel expense
—

 
1,407

 
1,407

Income tax (expense) benefit
(18,636
)
 
6,507

 
(12,129
)
Net other comprehensive income (loss) during period
29,908

 
(10,514
)
 
19,394

Balance December 31, 2014
$
18,512

 
$
(23,362
)
 
$
(4,850
)
Other comprehensive loss before reclassifications
(20,439
)
 
(17,892
)
 
(38,331
)
Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
Investment securities gain, net
(8,133
)
 
—

 
(8,133
)
Personnel expense
—

 
2,306

 
2,306

Interest income
(555
)
 
—

 
(555
)
Income tax benefit
11,074

 
5,873

 
16,947

Net other comprehensive loss during period
(18,053
)
 
(9,713
)
 
(27,766
)
Balance December 31, 2015
$
459

 
$
(33,075
)
 
$
(32,616
)