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Repurchase Agreements (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase, Fair Value of Collateral | $ 869,000 | $ 418,300
Securities Sold under Agreements to Repurchase | 740,674 | 324,425
Securities Sold under Agreements to Repurchase, Gross | 740,674 | 324,425
Government Agency |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 6,908 | 6,914
U. S. Treasury |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 733,766 | 186,010
Mortgage Backed Securities, Other [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase |  | 131,501
Overnight and continuous |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 710,674 | 294,425
Overnight and continuous | Government Agency |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 0 | 0
Overnight and continuous | U. S. Treasury |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 710,674 | 162,924
Overnight and continuous | Mortgage Backed Securities, Other [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase |  | 131,501
Up to 30 days |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 0 | 0
Up to 30 days | Government Agency |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 0 | 0
Up to 30 days | U. S. Treasury |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 0 | 0
Up to 30 days | Mortgage Backed Securities, Other [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase |  | 0
30 - 90 days |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 0 | 0
30 - 90 days | Government Agency |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 0 | 0
30 - 90 days | U. S. Treasury |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 0 | 0
30 - 90 days | Mortgage Backed Securities, Other [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase |  | 0
Greater than 90 days |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 30,000 | 30,000
Greater than 90 days | Government Agency |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | 6,908 | 6,914
Greater than 90 days | U. S. Treasury |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase | $ 23,092 | 23,086
Greater than 90 days | Mortgage Backed Securities, Other [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Sold under Agreements to Repurchase |  | $ 0

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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 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)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Repurchase Agreement Accounted for as a Collateralized Borrowing -URI http://asc.fasb.org/extlink&oid=49203159 + Details
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- Definition Fair value of securities pledged as collateral against securities sold under agreement to repurchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226013-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Repurchase Agreement Accounted for as a Collateralized Borrowing -URI http://asc.fasb.org/extlink&oid=49203159 + Details
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- Definition Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Repurchase Agreement Accounted for as a Collateralized Borrowing -URI http://asc.fasb.org/extlink&oid=49203159 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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