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Supplemental Comprehensive Income Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2012
Related Tax Effects Allocated to Each Component of Other Comprehensive Income | The following table identifies the related tax effects allocated to each component of other comprehensive income in the Consolidated Statements of Changes in Shareholders’ Equity for the years ended December 31:
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | Pretax Amount |  |  | Tax (Expense) Benefit |  |  | Net of Tax Amount |  |  | Pretax Amount |  |  | Tax (Expense) Benefit |  |  | Net of Tax Amount |  |  | Pretax Amount |  |  | Tax (Expense) Benefit |  |  | Net of Tax Amount |
|  | (dollars in thousands) |
Unrealized gains (losses) on securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized holding (losses) gains on securities arising during the period |  | $ | (2,854 | ) |  | $ | 1,006 |  |  | $ | (1,848 | ) |  | $ | 9,727 |  |  | $ | (3,404 | ) |  | $ | 6,323 |  |  | $ | (8,377 | ) |  | $ | 2,931 |  |  | $ | (5,446 | )
Noncredit related gains (losses) on securities not expected to be sold |  |  | 2,193 |  |  |  | (768 | ) |  |  | 1,425 |  |  |  | (425 | ) |  |  | 149 |  |  |  | (276 | ) |  |  | 6,633 |  |  |  | (2,321 | ) |  |  | 4,312 |
Less: reclassification adjustment for (gains) losses on securities included in net income |  |  | (192 | ) |  |  | 67 |  |  |  | (125 | ) |  |  | (2,185 | ) |  |  | 765 |  |  |  | (1,420 | ) |  |  | 6,822 |  |  |  | (2,388 | ) |  |  | 4,434 |
Unrealized gains (losses) for postretirement obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transition obligation |  |  | 2 |  |  |  | (1 | ) |  |  | 1 |  |  |  | 2 |  |  |  | (1 | ) |  |  | 1 |  |  |  | 2 |  |  |  | (1 | ) |  |  | 1 |
Net (loss) gain |  |  | (300 | ) |  |  | 105 |  |  |  | (195 | ) |  |  | (260 | ) |  |  | 91 |  |  |  | (169 | ) |  |  | 440 |  |  |  | (154 | ) |  |  | 286 |
Total other comprehensive (loss) income |  | $ | (1,151 | ) |  | $ | 409 |  |  | $ | (742 | ) |  | $ | 6,859 |  |  | $ | (2,400 | ) |  | $ | 4,459 |  |  | $ | 5,520 |  |  | $ | (1,933 | ) |  | $ | 3,587 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 + Details
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Namespace Prefix: | us-gaap_
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