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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018, 2017, and 2016 respectively, including changes during the years then ended as well as any reclassifications out of accumulated other comprehensive income (loss):
 
Investments
Securities
Available
For Sale
Defined Benefit
Pension and
Postretirement
Obligations
Accumulated
Other
Comprehensive
Income (Loss)
 
($ in Thousands)
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 losses (gains), net
(9,316
)
—

(9,316
)
Personnel expense
—

(73
)
(73
)
Other expense
—

3,874

3,874

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
—

(148
)
(148
)
Other expense
—

2,282

2,282

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
)
Other comprehensive income (loss) before reclassifications
(39,891
)
(28,612
)
(68,503
)
Amounts reclassified from accumulated other comprehensive income (loss)
 
 
 
Investment securities losses (gains), net
1,985

—

1,985

Personnel expense
—

(148
)
(148
)
Other expense
—

2,203

2,203

Adjustment for adoption of ASU 2016-01
(84
)
—

(84
)
Adjustment for adoption of ASU 2018-02
(8,419
)
(5,235
)
(13,654
)
Interest income (amortization of net unrealized losses (gains) on available for sale securities transferred to held to maturity securities)
(572
)
—

(572
)
Income tax (expense) benefit
9,791

6,767

16,558

Net other comprehensive income (loss) during period
(37,189
)
(25,025
)
(62,214
)
Balance, December 31, 2018
$
(75,643
)
$
(49,330
)
$
(124,972
)