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Schedule of the Remaining Contractual Maturity by Collateral Type of Securities Sold Under Agreements To Repurchase (Details) - USD ($) | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
--- | --- | --- | ---
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |  |
Securities sold under agreements to repurchase | $ 332,329,000 | $ 562,214,000 | $ 479,384,000
U.S. treasuries |  |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |  |
Securities sold under agreements to repurchase | 23,812,000 |  |
Government agency issued CMO |  |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |  |
Securities sold under agreements to repurchase | 308,517,000 |  |
Overnight and Continuous |  |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |  |
Securities sold under agreements to repurchase | 321,390,000 |  |
Overnight and Continuous | U.S. treasuries |  |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |  |
Securities sold under agreements to repurchase | 23,812,000 |  |
Overnight and Continuous | Government agency issued CMO |  |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |  |
Securities sold under agreements to repurchase | 297,578,000 |  |
Up to 30 Days |  |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |  |
Securities sold under agreements to repurchase | 10,939,000 |  |
Up to 30 Days | U.S. treasuries |  |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |  |
Securities sold under agreements to repurchase | 0 |  |
Up to 30 Days | Government agency issued CMO |  |  |
Transfer Of Certain Financial Assets Accounted For As Secured Borrowings [Line Items] |  |  |
Securities sold under agreements to repurchase | $ 10,939,000 |  |

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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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