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Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of Components of Comprehensive Income-Gross and Net of Tax
2015
 
 
 
 
 
 
($ in thousands)
 
Gross
 
Tax
 
Net
Net income
 
$
232,692

 
66,831

 
165,861

Components of OCI:
 
 

 
 

 
 

Unrealized gains on investment securities:
 
 

 
 

 
 

Unrealized holding losses during the year
 
(40,221
)
 
(14,078
)
 
(26,143
)
Amounts reclassified into net income:
 
 
 
 
 


HTM securities
 
(580
)
 
(203
)
 
(377
)
Non-credit OTTI
 
357

 
125

 
232

Realized gains on AFS securities
 
(14,016
)
 
(4,906
)
 
(9,110
)
Net unrealized losses
 
(54,460
)
 
(19,062
)
 
(35,398
)
Defined benefit pension and post-retirement plans:
 
 

 
 

 
 

Net actuarial gain
 
2,438

 
853

 
1,585

Amounts reclassified into net income:
 
 

 
 

 
 

Net actuarial loss
 
7,077

 
2,477

 
4,600

Defined benefit pension and post-retirement plans
 
9,515

 
3,330

 
6,185

Other comprehensive loss
 
(44,945
)
 
(15,732
)
 
(29,213
)
Comprehensive income
 
$
187,747

 
51,099

 
136,648

 

2014
 
 
 
 
 
 
($ in thousands)
 
Gross
 
Tax
 
Net
Net income
 
$
197,131

 
55,304

 
141,827

Components of OCI:
 
 

 
 

 
 

Unrealized gains on investment securities:
 
 

 
 

 
 

Unrealized holding gains during the year
 
72,940

 
25,529

 
47,411

Amounts reclassified into net income:
 
 
 
 
 


HTM securities
 
(1,299
)
 
(455
)
 
(844
)
Non-credit OTTI
 
1,669

 
584

 
1,085

Realized gains on AFS securities
 
(28,864
)
 
(10,102
)
 
(18,762
)
Net unrealized gains
 
44,446

 
15,556

 
28,890

Defined benefit pension and post-retirement plans:
 
 

 
 

 
 

Net actuarial loss
 
(54,136
)
 
(18,947
)
 
(35,189
)
Amounts reclassified into net income:
 
 

 
 

 
 

Net actuarial loss
 
1,902

 
666

 
1,236

Defined benefit pension and post-retirement plans
 
(52,234
)
 
(18,281
)
 
(33,953
)
Other comprehensive loss
 
(7,788
)
 
(2,725
)

(5,063
)
Comprehensive income
 
$
189,343

 
52,579

 
136,764


2013
 
 
 
 
 
 
($ in thousands)
 
Gross
 
Tax
 
Net
Net income
 
$
142,267

 
35,849

 
106,418

Components of OCI:
 
 

 
 

 
 

Unrealized losses on investment securities:
 
 

 
 

 
 

Unrealized holding losses during the period
 
(83,934
)
 
(29,377
)
 
(54,557
)
Non-credit OTTI recognized in OCI
 
77

 
27

 
50

Amounts reclassified into net income:
 
 
 
 
 


HTM securities
 
(1,577
)
 
(552
)
 
(1,025
)
Non-credit OTTI
 
14

 
5

 
9

Realized gains on AFS securities
 
(23,540
)
 
(8,239
)
 
(15,301
)
Net unrealized losses
 
(108,960
)
 
(38,136
)
 
(70,824
)
Defined benefit pension and post-retirement plans:
 
 

 
 

 
 

Net actuarial gain
 
59,654

 
20,879

 
38,775

Amounts reclassified into net income:
 
 

 
 

 
 

Net actuarial loss
 
4,374

 
1,531

 
2,843

Prior service cost
 
10

 
4

 
6

Curtailment expense
 
16

 
5

 
11

Defined benefit pension and post-retirement plans
 
64,054

 
22,419

 
41,635

Other comprehensive loss
 
(44,906
)
 
(15,717
)
 
(29,189
)
Comprehensive income
 
$
97,361

 
20,132

 
77,229
Schedule of Components of Accumulated Other Comprehensive Income
 
 
Net Unrealized (Loss) Gain on Investment Securities
 
 
 
 
 
 
($ in thousands)
 
OTTI Related
 
HTM Related
 
All Other
 
Investments Subtotal
 
Defined Benefit Pension and Post- retirement Plans
 
Total AOCI
Balance, December 31, 2013
 
$
(1,599
)
 
1,467

 
51,635

 
51,503

 
(26,652
)
 
24,851

OCI before reclassifications
 
—

 
—

 
47,411

 
47,411

 
(35,189
)
 
12,222

Amounts reclassified from AOCI
 
1,085

 
(844
)
 
(18,762
)
 
(18,521
)
 
1,236

 
(17,285
)
Net current period OCI
 
1,085

 
(844
)
 
28,649

 
28,890

 
(33,953
)
 
(5,063
)
Balance, December 31, 2014
 
(514
)
 
623

 
80,284

 
80,393

 
(60,605
)

19,788

OCI before reclassifications
 
—

 
—

 
(26,143
)
 
(26,143
)
 
1,585

 
(24,558
)
Amounts reclassified from AOCI
 
232

 
(377
)
 
(9,110
)
 
(9,255
)
 
4,600

 
(4,655
)
Net current period OCI
 
232

 
(377
)
 
(35,253
)
 
(35,398
)
 
6,185

 
(29,213
)
Balance, December 31, 2015
 
$
(282
)
 
246

 
45,031

 
44,995

 
(54,420
)
 
(9,425
)
 
Schedule of Reclassification out of Accumulated Other Comprehensive Income
 
 
 
Affected Line Item in the Consolidated Statement of Income
($ in thousands)
Year ended December 31, 2015
 
Year ended December 31, 2014
 
OTTI related
 
 
 
 
 
      Non-credit OTTI on disposed securities
$
357

 
1,669

 
Net realized gains
 
357

 
1,669

 
Income from continuing operations, before federal income tax
 
(125
)
 
(584
)
 
Total federal income tax expense
 
232

 
1,085

 
Net income
HTM related
 
 
 
 
 
Unrealized gains and losses on HTM disposals
308

 
157

 
Net realized investment gains
Amortization of net unrealized gains on HTM securities
(888
)
 
(1,456
)
 
Net investment income earned
 
(580
)
 
(1,299
)
 
Income from continuing operations, before federal income tax
 
203

 
455

 
Total federal income tax expense
 
(377
)
 
(844
)
 
Net income
Realized gains and losses on AFS
 
 
 
 
 
Realized gains and losses on AFS disposals
(14,016
)
 
(28,864
)
 
Net realized investment gains
 
(14,016
)
 
(28,864
)
 
Income from continuing operations, before federal income tax
 
4,906

 
10,102

 
Total federal income tax expense
 
(9,110
)
 
(18,762
)
 
Net income
Defined benefit pension and post-retirement life plans
 
 
 
 
 
Net actuarial loss
1,538

 
331

 
Losses and loss expenses incurred
 
5,539

 
1,571

 
Policy acquisition costs
 
7,077

 
1,902

 
Income from continuing operations, before federal income tax
 
 
 
 
 
 
Total defined benefit pension and post-retirement life
7,077

 
1,902

 
Income from continuing operations, before federal income tax
 
(2,477
)
 
(666
)
 
Total federal income tax expense
 
4,600

 
1,236

 
Net income
 
 
 
 
 
 
Total reclassifications for the period
$
(4,655
)
 
(17,285
)
 
Net income