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Accumulated Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
The following table summarizes the components of accumulated other comprehensive income (loss) at December 31, 2016, 2015, and 2014, changes during the years then ended, and reclassifications out of accumulated other comprehensive income (loss) during the years ended December 31, 2016, 2015, and 2014, respectively.
 
Investments
Securities
Available
For Sale
Defined Benefit
Pension and
Postretirement
Obligations
Accumulated
Other
Comprehensive
Income (Loss)
 
($ in Thousands)
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
)
Other comprehensive loss before reclassifications
(17,900
)
(6,141
)
(24,041
)
Amounts reclassified from accumulated other comprehensive loss:
 
 
 
Investment securities gain, net
(9,316
)
—

(9,316
)
Personnel expense
—

3,801

3,801

Interest income
(5,887
)
—

(5,887
)
Income tax benefit
12,565

815

13,380

Net other comprehensive loss during period
(20,538
)
(1,525
)
(22,063
)
Balance December 31, 2016
$
(20,079
)
$
(34,600
)
$
(54,679
)