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Commitments and Contingencies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended |  |  |  |  |  |  | 3 Months Ended |  |  |
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Feb. 28, 2011 | Mar. 31, 2012 Commitments to Extend Credit [Member] | Dec. 31, 2011 Commitments to Extend Credit [Member] | Mar. 31, 2011 Commitments to Extend Credit [Member] | Mar. 31, 2012 Standby Letters of Credit [Member] | Dec. 31, 2011 Standby Letters of Credit [Member] | Mar. 31, 2011 Standby Letters of Credit [Member] | Mar. 31, 2012 Recourse Obligation on Mortgage Loans Sold [Member] | Dec. 31, 2011 Recourse Obligation on Mortgage Loans Sold [Member] | Mar. 31, 2011 Recourse Obligation on Mortgage Loans Sold [Member] | Mar. 31, 2012 Obligation to Repurchase Receivables Sold [Member] Recourse Obligation on Mortgage Loans Sold [Member]
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unused commitments |  | $ 5,748,952 | $ 5,636,942 | $ 5,704,757 |  |  |  |  |  |  |
Guarantor obligations amount |  |  |  |  | $ 59,798 | $ 57,446 | $ 71,942 | $ 210,789 | $ 207,963 | $ 191,606 | $ 161,937
General maximum recourse period, days |  |  |  |  |  |  |  | 120 days |  |  |
Number of Directors in Complaint | 5 |  |  |  |  |  |  |  |  |  |

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 13 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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