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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2016
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 September 30, 2016 and 2015, changes during the three and nine month periods then ended, and reclassifications out of accumulated other comprehensive income (loss) during the three and nine month periods ended September 30, 2016 and 2015, respectively.
($ in Thousands)
Investments
Securities
Available
For Sale
 
Defined Benefit
Pension and
Post Retirement
Obligations
 
Accumulated
Other
Comprehensive
Income (Loss)
Balance January 1, 2016
$
459

 
$
(33,075
)
 
$
(32,616
)
Other comprehensive income before reclassifications
59,849

 
—

 
59,849

Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
Investment securities gain, net
(6,201
)
 
—

 
(6,201
)
Personnel expense
—

 
1,531

 
1,531

Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)
(4,465
)
 
—

 
(4,465
)
Income tax expense
(18,768
)
 
(584
)
 
(19,352
)
Net other comprehensive income during period
30,415

 
947

 
31,362

Balance September 30, 2016
$
30,874

 
$
(32,128
)
 
$
(1,254
)
Balance January 1, 2015
$
18,512

 
$
(23,362
)
 
$
(4,850
)
Other comprehensive income before reclassifications
35,101

 
—

 
35,101

Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
Investment securities gain, net
(4,038
)
 
—

 
(4,038
)
Personnel expense
—

 
1,729

 
1,729

Income tax expense
(11,907
)
 
(659
)
 
(12,566
)
Net other comprehensive income during period
19,156

 
1,070

 
20,226

Balance September 30, 2015
$
37,668

 
$
(22,292
)
 
$
15,376

 
 
 
 
 
 
($ in Thousands)
Investments
Securities
Available
For Sale
 
Defined Benefit
Pension and
Post Retirement
Obligations
 
Accumulated
Other
Comprehensive
Income (Loss)
Balance July 1, 2016
$
45,916

 
$
(32,463
)
 
$
13,453

Other comprehensive loss before reclassifications
(22,894
)
 
—

 
(22,894
)
Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
Investment securities loss, net
13

 
—

 
13

Personnel expense
—

 
541

 
541

Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)
(1,441
)
 
—

 
(1,441
)
Income tax (expense) benefit
9,280

 
(206
)
 
9,074

Net other comprehensive income (loss) during period
(15,042
)
 
335

 
(14,707
)
Balance September 30, 2016
$
30,874

 
$
(32,128
)
 
$
(1,254
)
Balance July 1, 2015
$
25,282

 
$
(22,688
)
 
$
2,594

Other comprehensive income before reclassifications
22,907

 
—

 
22,907

Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
Investment securities gain, net
(2,796
)
 
—

 
(2,796
)
Personnel expense
—

 
639

 
639

Income tax expense
(7,725
)
 
(243
)
 
(7,968
)
Net other comprehensive income during period
12,386

 
396

 
12,782

Balance September 30, 2015
$
37,668

 
$
(22,292
)
 
$
15,376