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Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of Components of Comprehensive Income-Gross and Net of Tax
2016
 
 
 
 
 
 
($ in thousands)
 
Gross
 
Tax
 
Net
Net income
 
$
219,955

 
61,460

 
158,495

Components of OCI:
 
 

 
 

 
 

Unrealized losses (gains) on investment securities:
 
 

 
 

 
 

Unrealized holding losses during the year
 
(9,195
)
 
(3,218
)
 
(5,977
)
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income
 
(10
)
 
(4
)
 
(6
)
Amounts reclassified into net income:
 
 
 
 
 


HTM securities
 
(141
)
 
(49
)
 
(92
)
Non-credit OTTI
 
213

 
75

 
138

Realized losses on AFS securities
 
4,713

 
1,649

 
3,064

Net unrealized losses
 
(4,420
)
 
(1,547
)
 
(2,873
)
Defined benefit pension and post-retirement plans:
 
 

 
 

 
 

Net actuarial loss
 
(12,079
)
 
(4,227
)
 
(7,852
)
Amounts reclassified into net income:
 
 

 
 

 
 

Net actuarial loss
 
6,462

 
2,262

 
4,200

Defined benefit pension and post-retirement plans
 
(5,617
)
 
(1,965
)
 
(3,652
)
Other comprehensive loss
 
(10,037
)
 
(3,512
)
 
(6,525
)
Comprehensive income
 
$
209,918

 
57,948

 
151,970

 
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
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, 2014
 
$
(514
)
 
623

 
80,284

 
80,393

 
(60,605
)
 
19,788

OCI before reclassifications
 
—

 
(52
)
 
(26,091
)
 
(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

 
(429
)
 
(35,201
)
 
(35,398
)
 
6,185

 
(29,213
)
Balance, December 31, 2015
 
(282
)
 
194

 
45,083

 
44,995

 
(54,420
)

(9,425
)
OCI before reclassifications
 
(6
)
 
—

 
(5,977
)
 
(5,983
)
 
(7,852
)
 
(13,835
)
Amounts reclassified from AOCI
 
138

 
(92
)
 
3,064

 
3,110

 
4,200

 
7,310

Net current period OCI
 
132

 
(92
)
 
(2,913
)
 
(2,873
)
 
(3,652
)
 
(6,525
)
Balance, December 31, 2016
 
$
(150
)
 
102

 
42,170

 
42,122

 
(58,072
)
 
(15,950
)
 
Schedule of Reclassification out of Accumulated Other Comprehensive Income
($ in thousands)
Year ended December 31, 2016
 
Year ended December 31, 2015
 
Affected Line Item in the Consolidated Statement of Income
HTM related
 
 
 
 
 
Unrealized losses on HTM disposals
$
169

 
308

 
Net realized (losses) gains
Amortization of net unrealized gains on HTM securities
(310
)
 
(888
)
 
Net investment income earned
 
(141
)
 
(580
)
 
Income before federal income tax
 
49

 
203

 
Total federal income tax expense
 
(92
)
 
(377
)
 
Net income
OTTI related
 
 
 
 
 
      Non-credit OTTI on disposed securities
213

 
357

 
Net realized (losses) gains
 
213

 
357

 
Income before federal income tax
 
(75
)
 
(125
)
 
Total federal income tax expense
 
138

 
232

 
Net income
Realized (losses) gains on AFS
 
 
 
 
 
Realized (losses) gains on AFS disposals
4,713

 
(14,016
)
 
Net realized (losses) gains
 
4,713

 
(14,016
)
 
Income before federal income tax
 
(1,649
)
 
4,906

 
Total federal income tax expense
 
3,064

 
(9,110
)
 
Net income
Defined benefit pension and post-retirement life plans
 
 
 
 
 
Net actuarial loss
1,486

 
1,538

 
Losses and loss expenses incurred
 
4,976

 
5,539

 
Policy acquisition costs
Total defined benefit pension and post-retirement life
6,462

 
7,077

 
Income before federal income tax
 
(2,262
)
 
(2,477
)
 
Total federal income tax expense
 
4,200

 
4,600

 
Net income
 
 
 
 
 
 
Total reclassifications for the period
$
7,310

 
(4,655
)
 
Net income