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Investment Securities (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Held-to-maturity debt securities amortized cost disclosures |  |  |
Due in one year or less, held-to-maturity debt securities amortized cost | $ 1,125 |  |
Due after one year through five years, held-to-maturity debt securities amortized cost | 1,325 |  |
Amortized cost, held-to-maturity debt securities | 2,450 |  |
Held-to-maturity debt securities, Estimated fair value disclosures |  |  |
Due in one year or less, held-to-maturity debt securities, Estimated fair value | 1,125 |  |
Due after one year through five years, held-to-maturity debt securities, Estimated fair value | 1,325 |  |
Estimated fair value, held-to-maturity debt securities | 2,450 |  |
Available-for-sale debt securities amortized cost disclosures |  |  |
Due after one year through five years, available-for-sale debt securities amortized cost | 636 |  |
Due after five years through ten years, available-for-sale debt securities amortized cost | 4,068 |  |
Due after ten years, available-for-sale debt securities amortized cost | 206,819 |  |
Residential mortgage-backed securities, amortized cost | 4,851,747 |  |
Equity securities, amortized cost | 18,825 |  |
Amortized cost, Available for sale securities | 5,082,095 | 5,041,847 |
Available for sale debt securities, Estimated Fair Value Disclosures |  |  |
Due after one year through five years, available-for-sale debt securities, Estimated Fair Value | 641 |  |
Due after five years through ten years, available-for-sale debt securities, Estimated Fair Value | 4,149 |  |
Due after ten years, available-for-sale debt securities, Estimated Fair Value | 219,971 |  |
Residential mortgage-backed securities, Estimated Fair Value | 4,969,263 |  |
Equity securities, Estimated Fair Value | 19,891 |  |
Estimated fair value, Available for sale securities | 5,213,915 | 5,086,457 |
Amortized cost of available for sale investment securities pledged | 2,624,520 |  |
Fair value of available for sale investment securities pledged | 2,717,496 |  |
Proceeds from sales and calls of available for sale securities | 1,102,849 | 1,149,021 | 579,099
Proceeds from sales of mortgage-backed securities | 1,095,815 | 1,133,610 | 544,305
Gross gains realized on sales | 17,318 | 33,223 | 11,980
Gross losses realized on sales | 33 | 14 | 24
Impairment charges on available for sale securities | 977 | 8,416 |
Impairment charges on available-for-sale investment securities, after tax | $ 635 | $ 5,470 |

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- Definition The amortized cost of available-for-sale securities that serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References No definition available. + Details
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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis after taxes. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References No definition available. + Details
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