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Securities Available-For-Sale (Gross Unrealized Losses On Mortgage-Backed Securities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses, less than 12 months | $ 18,138 | $ 157
Estimated Fair value, less than 12 months | 479,747 | 114,466
Unrealized losses, 12 months or more | 1,175 | 37
Estimated Fair value, 12 months or more | 49,530 | 8,237
Unrealized losses, total | 19,313 | 194
Estimated fair value, total | 529,277 | 122,703
Pass-through Certificates [Member] | GSE [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses, less than 12 months | 5,087 | 99
Estimated Fair value, less than 12 months | 150,473 | 14,156
Unrealized losses, 12 months or more | 26 |
Estimated Fair value, 12 months or more | 4,482 |
Unrealized losses, total | 5,113 | 99
Estimated fair value, total | 154,955 | 14,156
Real Estate Mortgage Investments Conduits (REMICs) [Member] | GSE [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses, less than 12 months | 12,923 | 58
Estimated Fair value, less than 12 months | 283,419 | 100,310
Unrealized losses, 12 months or more | 1,124 | 4
Estimated Fair value, 12 months or more | 44,606 | 7,633
Unrealized losses, total | 14,047 | 62
Estimated fair value, total | 328,025 | 107,943
Real Estate Mortgage Investments Conduits (REMICs) [Member] | Non-GSE [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses, less than 12 months | 23 |
Estimated Fair value, less than 12 months | 1,092 |
Unrealized losses, 12 months or more | 25 | 33
Estimated Fair value, 12 months or more | 442 | 604
Unrealized losses, total | 48 | 33
Estimated fair value, total | 1,534 | 604
Other Available For Sale Securities [Member] | Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized losses, less than 12 months | 105 |
Estimated Fair value, less than 12 months | 44,763 |
Unrealized losses, total | 105 |
Estimated fair value, total | $ 44,763 |

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- Definition Amount of the excess of amortized cost basis over fair value of securities in a loss position and categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -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. + Details
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