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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 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 December 31, 2017, 2016, and 2015, changes during the years then ended, and reclassifications out of accumulated other comprehensive income (loss) during the years ended December 31, 2017, 2016, and 2015, respectively.
 
Investments
Securities
Available
For Sale
Defined Benefit
Pension and
Postretirement
Obligations
Accumulated
Other
Comprehensive
Income (Loss)
 
($ in Thousands)
Balance, December 31, 2014
$
18,512

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

(8,133
)
—

(8,133
)
Personnel expense
—

2,306

2,306

Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)
(555
)
—

(555
)
Income tax (expense) benefit
11,074

5,873

16,947

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

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

(17,900
)
(6,141
)
(24,041
)
Amounts reclassified from accumulated other comprehensive income (loss)
 
 
 
Investment securities gain (loss), net
(9,316
)
—

(9,316
)
Personnel expense
—

3,801

3,801

Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)

(5,887
)
—

(5,887
)
Income tax (expense) benefit

12,565

815

13,380

Net other comprehensive income (loss) during period

(20,538
)
(1,525
)
(22,063
)
Balance, December 31, 2016
$
(20,079
)
$
(34,600
)
$
(54,679
)
Other comprehensive income (loss) before reclassifications

(27,040
)
14,273

(12,767
)
Amounts reclassified from accumulated other comprehensive income (loss)

 
 
 
Personnel expense
—

2,134

2,134

Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)

(2,665
)
—

(2,665
)
Income tax (expense) benefit

11,331

(6,112
)
5,219

Net other comprehensive income (loss) during period

(18,374
)
10,295

(8,079
)
Balance, December 31, 2017
$
(38,453
)
$
(24,305
)
$
(62,758
)