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Borrowings (Repurchase Transaction Liability and Market Value of its Underlying Collateral) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets Sold Under Agreements To Repurchase Line Items
Assets Sold Under Agreements To Repurchase Repurchase Liability	$ 1,010,000	$ 1,265,000
Assets Sold Under Agreements To Repurchase Interest Rate	2.89%
Market value of underlying collateral of a repurchase agreement	1,133,922	1,342,505
FNMA and FHLMC [Member]
Assets Sold Under Agreements To Repurchase Line Items
Market value of underlying collateral of a repurchase agreement	1,061,519	1,234,833
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Assets Sold Under Agreements To Repurchase Line Items
Market value of underlying collateral of a repurchase agreement	2,403	3,000
Collateralized Mortgage Obligations [Member]
Assets Sold Under Agreements To Repurchase Line Items
Market value of underlying collateral of a repurchase agreement	0	94,023
US Government-sponsored Enterprises Debt Securities [Member]
Assets Sold Under Agreements To Repurchase Line Items
Market value of underlying collateral of a repurchase agreement	70,000	10,649
Securities Sold under Agreements to Repurchase [Member]
Assets Sold Under Agreements To Repurchase Line Items
Assets Sold Under Agreements To Repurchase Interest Rate		2.41%
Securities Sold under Agreements to Repurchase [Member] | Maturity up to 30 days
Assets Sold Under Agreements To Repurchase Line Items
Assets Sold Under Agreements To Repurchase Repurchase Liability		255,000
Assets Sold Under Agreements To Repurchase Interest Rate		0.50%
Market value of underlying collateral of a repurchase agreement		272,053
Securities Sold under Agreements to Repurchase [Member] | Maturity up to 30 days | FNMA and FHLMC [Member]
Assets Sold Under Agreements To Repurchase Line Items
Market value of underlying collateral of a repurchase agreement		216,201
Securities Sold under Agreements to Repurchase [Member] | Maturity up to 30 days | Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Assets Sold Under Agreements To Repurchase Line Items
Market value of underlying collateral of a repurchase agreement		0
Securities Sold under Agreements to Repurchase [Member] | Maturity up to 30 days | Collateralized Mortgage Obligations [Member]
Assets Sold Under Agreements To Repurchase Line Items
Market value of underlying collateral of a repurchase agreement		48,923
Securities Sold under Agreements to Repurchase [Member] | Maturity up to 30 days | US Government-sponsored Enterprises Debt Securities [Member]
Assets Sold Under Agreements To Repurchase Line Items
Market value of underlying collateral of a repurchase agreement		6,929
Securities Sold under Agreements to Repurchase [Member] | Maturity over 90 days
Assets Sold Under Agreements To Repurchase Line Items
Assets Sold Under Agreements To Repurchase Repurchase Liability	1,010,000	1,010,000
Assets Sold Under Agreements To Repurchase Interest Rate	2.89%	2.89%
Market value of underlying collateral of a repurchase agreement	1,133,922	1,070,452
Securities Sold under Agreements to Repurchase [Member] | Maturity over 90 days | FNMA and FHLMC [Member]
Assets Sold Under Agreements To Repurchase Line Items
Market value of underlying collateral of a repurchase agreement	1,061,519	1,018,632
Securities Sold under Agreements to Repurchase [Member] | Maturity over 90 days | Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Assets Sold Under Agreements To Repurchase Line Items
Market value of underlying collateral of a repurchase agreement	2,403	3,000
Securities Sold under Agreements to Repurchase [Member] | Maturity over 90 days | Collateralized Mortgage Obligations [Member]
Assets Sold Under Agreements To Repurchase Line Items
Market value of underlying collateral of a repurchase agreement	0	45,100
Securities Sold under Agreements to Repurchase [Member] | Maturity over 90 days | US Government-sponsored Enterprises Debt Securities [Member]
Assets Sold Under Agreements To Repurchase Line Items
Market value of underlying collateral of a repurchase agreement	$ 70,000	$ 3,720

X

- Definition

Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph m

-Subparagraph 1

-Article 4



Reference 2: 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)(ii))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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X

- Definition

Market value of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets.

+ 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)(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph m

-Subparagraph 1

-Article 4

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph m

-Subparagraph 1

-Article 4



Reference 2: 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)(ii))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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