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Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of Components of Comprehensive Income-Gross and Net of Tax
Third Quarter 2018
 
 
 
 
 
 
($ in thousands)
 
Gross
 
Tax
 
Net
Net income
 
$
67,130

 
11,695

 
55,435

Components of other comprehensive loss:
 
 

 
 

 
 

Unrealized losses on investment securities:
 
 

 
 

 
 

Unrealized holding losses during period
 
(21,565
)
 
(4,529
)
 
(17,036
)
Amounts reclassified into net income:
 
 
 
 
 
 
HTM securities
 
(8
)
 
(2
)
 
(6
)
Realized losses on disposals of AFS securities
 
10,839

 
2,276

 
8,563

    Total unrealized losses on investment securities
 
(10,734
)
 
(2,255
)
 
(8,479
)
Defined benefit pension and post-retirement plans:
 
 

 
 

 
 

Amounts reclassified into net income:
 
 

 
 

 
 

Net actuarial loss
 
532

 
112

 
420

    Total defined benefit pension and post-retirement plans
 
532

 
112

 
420

Other comprehensive loss
 
(10,202
)
 
(2,143
)
 
(8,059
)
Comprehensive income
 
$
56,928

 
9,552

 
47,376

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Third Quarter 2017
 
 
 
 
 
 
($ in thousands)
 
Gross
 
Tax
 
Net
Net income
 
$
67,315

 
20,597

 
46,718

Components of OCI:
 
 

 
 

 
 

Unrealized gains on investment securities:
 
 

 
 

 
 

Unrealized holding gains during period
 
16,729

 
5,855

 
10,874

Non-credit portion of OTTI recognized in OCI
 
30

 
11

 
19

Amounts reclassified into net income:
 
 
 
 
 
 
HTM securities
 
(54
)
 
(19
)
 
(35
)
Non-credit OTTI
 
38

 
13

 
25

Realized gains on disposals of AFS securities
 
(6,760
)
 
(2,366
)
 
(4,394
)
    Total unrealized gains on investment securities
 
9,983

 
3,494

 
6,489

Defined benefit pension and post-retirement plans:
 
 

 
 

 
 

Amounts reclassified into net income:
 
 

 
 

 
 

Net actuarial loss
 
507

 
178

 
329

    Total defined benefit pension and post-retirement plans
 
507

 
178

 
329

Other comprehensive income
 
10,490

 
3,672

 
6,818

Comprehensive income
 
$
77,805

 
24,269

 
53,536


Nine Months 2018
 
 
 
 
 
 
($ in thousands)
 
Gross
 
Tax
 
Net
Net income
 
$
159,586

 
26,407

 
133,179

Components of other comprehensive loss:
 
 

 
 

 
 

Unrealized losses on investment securities:
 
 

 
 

 
 

Unrealized holding losses during period
 
(130,873
)
 
(27,484
)
 
(103,389
)
Amounts reclassified into net income:
 
 
 
 
 
 
HTM securities
 
(28
)
 
(6
)
 
(22
)
Realized losses on disposals of AFS securities
 
18,258

 
3,834

 
14,424

    Total unrealized losses on investment securities
 
(112,643
)
 
(23,656
)
 
(88,987
)
Defined benefit pension and post-retirement plans:
 
 

 
 

 
 

Amounts reclassified into net income:
 
 

 
 
 
 
Net actuarial loss
 
1,595

 
335

 
1,260

    Total defined benefit pension and post-retirement plans
 
1,595

 
335

 
1,260

Other comprehensive loss
 
(111,048
)
 
(23,321
)
 
(87,727
)
Comprehensive income
 
$
48,538

 
3,086

 
45,452

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months 2017
 
 
 
 
 
 
($ in thousands)
 
Gross
 
Tax
 
Net
Net income
 
$
193,818

 
55,234

 
138,584

Components of OCI:
 
 

 
 
 
 
Unrealized gains on investment securities:
 
 

 
 
 
 
Unrealized holding gains during period
 
78,401

 
27,440

 
50,961

Non-credit portion of OTTI recognized in OCI
 
36

 
13

 
23

Amounts reclassified into net income:
 
 
 
 
 
 
HTM securities
 
(146
)
 
(51
)
 
(95
)
Non-credit OTTI
 
38

 
13

 
25

Realized gains on disposals of AFS securities
 
(7,135
)
 
(2,497
)
 
(4,638
)
    Total unrealized gains on investment securities
 
71,194

 
24,918

 
46,276

Defined benefit pension and post-retirement plans:
 
 

 
 

 
 

Amounts reclassified into net income:
 
 

 
 
 
 
Net actuarial loss
 
1,522

 
533

 
989

    Total defined benefit pension and post-retirement plans
 
1,522

 
533

 
989

Other comprehensive income
 
72,716

 
25,451

 
47,265

Comprehensive income
 
$
266,534

 
80,685

 
185,849
Schedule of Components of Accumulated Other Comprehensive Income Net of Tax
September 30, 2018
 
 
 
Defined Benefit
Pension and Post-Retirement Plans
 
 
 
 
Net Unrealized Gains (Losses) on Investment Securities
 
 
Total AOCI
($ in thousands)
 
OTTI
Related
 
HTM
Related
 
All
Other
 
Investments
Subtotal
 
 
Balance, December 31, 2017
 
$
(59
)
 
(14
)
 
80,648

 
80,575

 
(60,405
)
 
20,170

Cumulative effect adjustments
 
(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
 
—

 
—

 
(103,389
)
 
(103,389
)
 
—

 
(103,389
)
Amounts reclassified from AOCI
 
—

 
(22
)
 
14,424

 
14,402

 
1,260

 
15,662

Net current period OCI
 
—

 
(22
)
 
(88,965
)
 
(88,987
)
 
1,260

 
(87,727
)
Balance, September 30, 2018
 
$
(71
)
 
(38
)
 
(21,109
)
 
(21,218
)
 
(71,358
)
 
(92,576
)
Schedule of Reclassifications Out Of Accumulated Other Comprehensive Income
 
Quarter ended September 30,
 
Nine Months ended September 30,
Affected Line Item in the Unaudited Consolidated Statements of Income
($ in thousands)
2018
 
2017
 
2018
 
2017
OTTI related
 
 
 
 
 
 
 
 
Non-credit OTTI on disposed securities
$
—

 
38

 
—

 
38

Net realized and unrealized (losses) gains
 
—

 
38

 
—

 
38

Income before federal income tax
 
—

 
(13
)
 
—

 
(13
)
Total federal income tax expense
 
—

 
25

 
—

 
25

Net income
HTM related
 
 
 
 
 
 
 
 
Unrealized losses on HTM disposals
$
11

 
11

 
5

 
41

Net realized and unrealized (losses) gains
Amortization of net unrealized gains on HTM securities
(19
)
 
(65
)
 
(33
)
 
(187
)
Net investment income earned
 
(8
)
 
(54
)
 
(28
)
 
(146
)
Income before federal income tax
 
2

 
19

 
6

 
51

Total federal income tax expense
 
(6
)
 
(35
)
 
(22
)
 
(95
)
Net income
Realized losses (gains) on AFS and OTTI
 
 
 
 
 
 
 
 
Realized losses (gains) on AFS disposals and OTTI
10,839

 
(6,760
)
 
18,258

 
(7,135
)
Net realized and unrealized (losses) gains
 
10,839

 
(6,760
)
 
18,258

 
(7,135
)
Income before federal income tax
 
(2,276
)
 
2,366

 
(3,834
)
 
2,497

Total federal income tax expense
 
8,563

 
(4,394
)
 
14,424

 
(4,638
)
Net income
Defined benefit pension and post-retirement life plans
 
 
 
 
 
 
 
 
Net actuarial loss
112

 
110

 
337

 
331

Loss and loss expense incurred
 
420

 
397

 
1,258

 
1,191

Other insurance expenses
Total defined benefit pension and post-retirement life
532

 
507

 
1,595

 
1,522

Income before federal income tax
 
(112
)
 
(178
)
 
(335
)
 
(533
)
Total federal income tax expense
 
420

 
329

 
1,260

 
989

Net income
 
 
 
 
 
 
 
 
 
Total reclassifications for the period
$
8,977

 
(4,075
)
 
15,662

 
(3,719
)
Net income