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Stockholders' Equity and Comprehensive Income (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of components of comprehensive income (loss) including, but not limited to: (a) foreign currency translation adjustments; (b) gains (losses) on foreign currency transactions that are designated as, and are effective as, economic hedges of a net investment in a foreign entity; (c) gains (losses) on intercompany foreign currency transactions that are of a long-term-investment nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; (d) change in the market value of a futures contract that qualifies as a hedge of an asset reported at fair value; (e) unrealized holding gains (losses) on available-for-sale securities and that resulting from transfers of debt securities from the held-to-maturity category to the available-for-sale category; (f) a net loss recognized as an additional pension liability not yet recognized as net periodic pension cost; and (g) the net gain (loss) and net prior service cost or credit for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e526-108580 + Details
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- Definition Tabular disclosure of an entity's treasury stock, including the average cost per share, carrying basis for each class of treasury stock, description of share repurchase program authorized by an entity's board of directors, the number of shares repurchased, the cost of the shares repurchased, the remaining maximum dollar value of shares available for repurchase under the program, the treatment of the purchase price in excess of the current market value, number of shares held for each class of treasury stock, and other information necessary to a fair presentation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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