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Repurchase Agreements (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
REPURCHASE AGREEMENTS [Abstract] |  |
Repurchase Agreements, Maturities | P114D | P67D
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance | $ 3,580,754 | $ 3,564,128
Repurchage agreement, Weighted Average Interest Rate | 0.61% | 0.70%
Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Available-for-sale or Held-for-investment | 3,890,066 | 3,935,504
Deferred Costs | (243) | (659)
Bonds [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance | 20,651 | 28,113
Repurchage agreement, Weighted Average Interest Rate | 1.59% | 1.64%
Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Available-for-sale or Held-for-investment | 19,686 | 31,483
Residential Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance | 2,522,503 | 2,365,982
Repurchage agreement, Weighted Average Interest Rate | 0.42% | 0.48%
Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Available-for-sale or Held-for-investment | 2,598,158 | 2,458,200
Residential Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance | 10,569 | 7,808
Repurchage agreement, Weighted Average Interest Rate | 1.80% | 1.84%
Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Available-for-sale or Held-for-investment | 12,746 | 9,634
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance | 246,849 | 248,771
Repurchage agreement, Weighted Average Interest Rate | 0.39% | 0.47%
Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Available-for-sale or Held-for-investment | 306,318 | 291,445
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance | 303,674 | 382,352
Repurchage agreement, Weighted Average Interest Rate | 1.27% | 1.34%
Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Available-for-sale or Held-for-investment | 367,859 | 465,306
Interest-Only-Strip [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance | 369,948 | 443,540
Repurchage agreement, Weighted Average Interest Rate | 1.16% | 1.22%
Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Available-for-sale or Held-for-investment | 449,072 | 565,494
Interest-Only-Strip [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance | 106,803 | 88,221
Repurchage agreement, Weighted Average Interest Rate | 1.27% | 1.46%
Pledged Financial Instruments, Not Separately Reported, Mortgage-Related Securities Available-for-sale or Held-for-investment | $ 136,227 | $ 113,942

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- Definition The carrying amount as of the date of the latest financial statement presented of mortgage-related securities classified as available for sale or held for investment which are owned but transferred to another party to 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729 + Details
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- Definition This describes the time frame of the terms of the entity's repurchase agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Carrying amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729 + Details
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