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Stockholders' Equity and Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2012
Stockholders' Equity Note [Abstract]  
Schedule of Parent's Common Stock
($ in thousands)
 
 
 
 
 
Period
 
Shares Purchased in Connection with Restricted Stock Vestings and Stock Option Exercises
 
Cost of Shares Purchased in Connection with Restricted Stock Vestings and Stock Option
Exercises
2012
 
194,575

 
$
3,495

2011
 
149,997

 
2,741

2010
 
107,425

 
1,686
Components of Comprehensive Income-Gross and Net of Tax
2012
 
 
 
 
 
 
($ in thousands)
 
Gross
 
Tax
 
Net
Net income
 
$
37,635

 
(328
)
 
37,963

Components of OCI:
 
 

 
 

 
 

Unrealized gains on securities:
 
 

 
 

 
 

Unrealized holding gains during the period
 
47,594

 
16,657

 
30,937

Portion of OTTI recognized in OCI
 
2,834

 
992

 
1,842

Amortization of net unrealized gains on HTM securities
 
(1,303
)
 
(456
)
 
(847
)
Reclassification adjustment for gains included in net income
 
(10,541
)
 
(3,689
)
 
(6,852
)
Net unrealized gains
 
38,584

 
13,504

 
25,080

Defined benefit pension and post-retirement plans:
 
 

 
 

 
 

Net actuarial loss
 
(26,566
)
 
(9,298
)
 
(17,268
)
Reversal of amortization items:
 
 

 
 

 
 

Net actuarial loss
 
5,903

 
2,066

 
3,837

Prior service cost
 
150

 
53

 
97

Defined benefit pension and post-retirement plans
 
(20,513
)
 
(7,179
)
 
(13,334
)
Comprehensive income
 
$
55,706

 
5,997

 
49,709

 

2011
 
 
 
 
 
 
($ in thousands)
 
Gross
 
Tax
 
Net
Net income
 
$
10,400

 
(11,633
)
 
22,033

Components of OCI:
 
 

 
 

 
 

Unrealized gains on securities:
 
 

 
 

 
 

Unrealized holding gains during the period
 
70,140

 
24,548

 
45,592

Portion of OTTI recognized in OCI
 
1,682

 
589

 
1,093

Amortization of net unrealized gains on HTM securities
 
(3,097
)
 
(1,084
)
 
(2,013
)
Reclassification adjustment for gains included in net income
 
(1,987
)
 
(695
)
 
(1,292
)
Net unrealized gains
 
66,738

 
23,358

 
43,380

Defined benefit pension and post-retirement plans:
 
 

 
 

 
 

Net actuarial loss
 
(16,799
)
 
(5,880
)
 
(10,919
)
Reversal of amortization items:
 
 

 
 

 
 

Net actuarial loss
 
4,172

 
1,460

 
2,712

Prior service cost
 
150

 
53

 
97

Defined benefit pension and post-retirement plans
 
(12,477
)
 
(4,367
)
 
(8,110
)
Comprehensive income
 
$
64,661

 
7,358

 
57,303

2010
 
 
 
 
 
 
($ in thousands)
 
Gross
 
Tax
 
Net
Net income
 
$
78,334

 
11,368

 
66,966

Components of OCI:
 
 

 
 

 
 

Unrealized gains on securities:
 
 

 
 

 
 

Unrealized holding gains during the period
 
44,643

 
15,625

 
29,018

Portion of OTTI recognized in OCI
 
5,256

 
1,840

 
3,416

Amortization of net unrealized gains on HTM securities
 
(11,708
)
 
(4,098
)
 
(7,610
)
Reclassification adjustment for gains included in net income
 
(454
)
 
(159
)
 
(295
)
Net unrealized gains
 
37,737

 
13,208

 
24,529

Defined benefit pension and post-retirement plans:
 
 

 
 

 
 

Net actuarial loss
 
(12,045
)
 
(4,216
)
 
(7,829
)
Reversal of amortization items:
 
 

 
 

 
 

Net actuarial loss
 
4,134

 
1,447

 
2,687

Prior service cost
 
150

 
53

 
97

Defined benefit pension and post-retirement plans
 
(7,761
)
 
(2,716
)
 
(5,045
)
Comprehensive income
 
$
108,310

 
21,860

 
86,450
Components of Accumulated Other Comprehensive Income
 
 
Net Unrealized (Loss) Gain
 

 
 
($ in thousands)
 
OTTI Related
 
HTM Related
 
All Other
 
Defined Benefit Pension and Post- retirement Plans
 
Total AOCI
Balance, December 31, 2010
 
$
(4,593
)
 
11,144

 
47,316

 
(46,843
)
 
7,024

Changes in component during period
 
1,093

 
(6,522
)
 
48,809

 
(8,110
)
 
35,270

Balance, December 31, 2011
 
(3,500
)
 
4,622

 
96,125

 
(54,953
)
 
42,294

Changes in component during period
 
1,842

 
(2,028
)
 
25,266

 
(13,334
)
 
11,746

Balance, December 31, 2012
 
$
(1,658
)
 
2,594

 
121,391

 
(68,287
)
 
54,040