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Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of Components of Comprehensive Income-Gross and Net of Tax
2018
 
 
 
 
 
 
($ in thousands)
 
Gross
 
Tax
 
Net
Net income
 
$
211,721

 
32,782

 
178,939

Components of OCI:
 
 

 
 

 
 

Unrealized (losses) gains on investment securities:
 
 

 
 

 
 

Unrealized holding losses during the year
 
(123,145
)
 
(25,861
)
 
(97,284
)
Amounts reclassified into net income:
 
 
 
 
 


HTM securities
 
110

 
23

 
87

Realized losses on AFS securities
 
39,641

 
8,325

 
31,316

Net unrealized losses
 
(83,394
)
 
(17,513
)
 
(65,881
)
Defined benefit pension and post-retirement plans:
 
 

 
 

 
 

Net actuarial loss
 
(11,273
)
 
(2,367
)
 
(8,906
)
Amounts reclassified into net income:
 
 

 
 

 
 

Net actuarial loss
 
2,127

 
447

 
1,680

Defined benefit pension and post-retirement plans
 
(9,146
)
 
(1,920
)
 
(7,226
)
Other comprehensive loss
 
(92,540
)
 
(19,433
)
 
(73,107
)
Comprehensive income
 
$
119,181

 
13,349

 
105,832

 
2017
 
 
 
 
 
 
($ in thousands)
 
Gross
 
Tax
 
Net
Net income
 
$
261,968

 
93,142

 
168,826

Components of OCI:
 
 

 
 

 
 

Unrealized gains (losses) on investment securities:
 
 

 
 

 
 

Unrealized holding gains during the year
 
66,894

 
23,879

 
43,015

Non-credit portion of OTTI recognized in OCI
 
36

 
13

 
23

Amounts reclassified into net income:
 
 
 
 
 


HTM securities
 
(179
)
 
(63
)
 
(116
)
Non-credit OTTI
 
104

 
36

 
68

Realized gains on AFS securities
 
(6,979
)
 
(2,442
)
 
(4,537
)
Net unrealized gains
 
59,876

 
21,423

 
38,453

Defined benefit pension and post-retirement plans:
 
 

 
 

 
 

Net actuarial loss
 
(4,684
)
 
(984
)
 
(3,700
)
Amounts reclassified into net income:
 
 

 
 

 
 

Net actuarial loss
 
2,102

 
735

 
1,367

Defined benefit pension and post-retirement plans
 
(2,582
)
 
(249
)
 
(2,333
)
Other comprehensive income
 
57,294

 
21,174


36,120

Comprehensive income
 
$
319,262

 
114,316

 
204,946

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 OTTI recognized in OCI
 
(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
Schedule of Components of Accumulated Other Comprehensive Income
 
 
Net Unrealized (Loss) Gain on Investment Securities
 
Defined Benefit Pension and Post-retirement Plans
 
 
($ in thousands)
 
OTTI Related
 
HTM Related
 
All Other
 
Investments Subtotal
 
 
Total AOCI
Balance, December 31, 2016
 
$
(150
)
 
102

 
42,170

 
42,122

 
(58,072
)
 
(15,950
)
OCI before reclassifications
 
23

 
—

 
43,015

 
43,038

 
(3,700
)
 
39,338

Amounts reclassified from AOCI
 
68

 
(116
)
 
(4,537
)
 
(4,585
)
 
1,367

 
(3,218
)
Net current period OCI
 
91

 
(116
)
 
38,478

 
38,453

 
(2,333
)
 
36,120

Balance, December 31, 2017
 
(59
)
 
(14
)
 
80,648

 
80,575

 
(60,405
)

20,170

Cumulative effect adjustments1

 
(12
)
 
(2
)
 
(12,792
)
 
(12,806
)
 
(12,213
)
 
(25,019
)
Balance: December 31, 2017 as adjusted

 
$
(71
)
 
(16
)
 
67,856

 
67,769

 
(72,618
)
 
(4,849
)
OCI before reclassifications
 
—

 
—

 
(97,284
)
 
(97,284
)
 
(8,906
)
 
(106,190
)
Amounts reclassified from AOCI
 
—

 
87

 
31,316

 
31,403

 
1,680

 
33,083

Net current period OCI
 
—

 
87

 
(65,968
)
 
(65,881
)
 
(7,226
)
 
(73,107
)
Balance, December 31, 2018
 
$
(71
)
 
71

 
1,888

 
1,888

 
(79,844
)
 
(77,956
)
 
1 Upon adoption of ASU 2016-01 and ASU 2018-02 in the first quarter of 2018, we recognized a $25.0 million cumulative-effect adjustment to the opening balance of AOCI, which represents the after-tax net unrealized gain on our equity portfolio as of December 31, 2017 and the one-time reclassification from AOCI to retained earnings for the stranded tax assets that were created in AOCI from the enactment of Tax Reform. See Note 3. "Adoption of Accounting Pronouncements" above for additional information.
Schedule of Reclassification out of Accumulated Other Comprehensive Income
($ in thousands)
 
Year ended December 31, 2018
 
Year ended December 31, 2017
 
Affected Line Item in the Consolidated Statements of Income
OTTI related
 
 
 
 
 
 
      Non-credit OTTI on disposed securities
 
$
—

 
104

 
Net realized and unrealized (losses) gains
 
 
—

 
104

 
Income before federal income tax
 
 
—

 
(36
)
 
Total federal income tax expense
 
 
—

 
68

 
Net income
HTM related
 
 
 
 
 
 
Unrealized losses on HTM disposals
 
137

 
32

 
Net realized and unrealized (losses) gains

Amortization of net unrealized gains on HTM securities
 
(27
)
 
(211
)
 
Net investment income earned
 
 
110

 
(179
)
 
Income before federal income tax
 
 
(23
)
 
63

 
Total federal income tax expense
 
 
87

 
(116
)
 
Net income
Realized losses (gains) on AFS
 
 
 
 
 
 
Realized losses (gains) on AFS disposals
 
39,641

 
(6,979
)
 
Net realized and unrealized (losses) gains

 
 
39,641

 
(6,979
)
 
Income before federal income tax
 
 
(8,325
)
 
2,442

 
Total federal income tax expense
 
 
31,316

 
(4,537
)
 
Net income
Defined benefit pension and post-retirement life plans
 
 
 
 
 
 
Net actuarial loss
 
450

 
450

 
Loss and loss expense incurred
 
 
1,677

 
1,652

 
Other insurance expenses
Total defined benefit pension and post-retirement life
 
2,127

 
2,102

 
Income before federal income tax
 
 
(447
)
 
(735
)
 
Total federal income tax expense
 
 
1,680

 
1,367

 
Net income
 
 
 
 
 
 
 
Total reclassifications for the period
 
$
33,083

 
(3,218
)
 
Net income