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Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2013
Equity [Abstract] |
Components of accumulated other comprehensive income |
(Dollars in thousands) | March 31, 2013 |  | December 31, 2012
Unrealized gains on available-for-sale securities | $ | 96,036 |  |  | 95,328 |
Tax effect | (37,358 | ) |  | (37,083 | )
Net of tax amount | 58,678 |  |  | 58,245 |
Unrealized losses on derivatives used for cash flow hedges | (14,080 | ) |  | (16,832 | )
Tax effect | 5,477 |  |  | 6,549 |
Net of tax amount | (8,603 | ) |  | (10,283 | )
Total accumulated other comprehensive income | $ | 50,075 |  |  | 47,962 |

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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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