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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2017
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 March 31, 2017 and 2016, changes during the three month periods then ended, and reclassifications out of accumulated other comprehensive income (loss) during the three month periods ended March 31, 2017 and 2016, respectively.
($ in Thousands)
Investments
Securities
Available
For Sale
 
Defined Benefit
Pension and
Post Retirement
Obligations
 
Accumulated
Other
Comprehensive
Income (Loss)
Balance January 1, 2017
$
(20,079
)
 
$
(34,600
)
 
$
(54,679
)
Other comprehensive loss before reclassifications
(2,112
)
 
—

 
(2,112
)
Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
Personnel expense
—

 
450

 
450

Interest income (Amortization of net unrealized gains (losses) on available for sale securities transferred to held to maturity securities)
(1,027
)
 
—

 
(1,027
)
Income tax (expense) benefit
1,195

 
(171
)
 
1,024

Net other comprehensive income during period
(1,944
)
 
279

 
(1,665
)
Balance March 31, 2017
$
(22,023
)
 
$
(34,321
)
 
$
(56,344
)
Balance January 1, 2016
$
459

 
$
(33,075
)
 
$
(32,616
)
Other comprehensive income before reclassifications
60,422

 
—

 
60,422

Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
Investment securities gain, net
(3,098
)
 
—

 
(3,098
)
Personnel expense
—

 
495

 
495

Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)
(1,572
)
 
—

 
(1,572
)
Income tax expense
(21,275
)
 
(189
)
 
(21,464
)
Net other comprehensive income during period
34,477

 
306

 
34,783

Balance March 31, 2016
$
34,936

 
$
(32,769
)
 
$
2,167