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Borrowings (Repurchase Transaction Liability and Market Value of its Underlying Collateral) (Details) - Securities Sold under Agreements to Repurchase [Member] - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Assets Sold Under Agreements To Repurchase Line Items |  |
Assets Sold Under Agreements To Repurchase Repurchase Liability | $ 282,500 | $ 652,229
Assets Sold Under Agreements To Repurchase Interest Rate | 1.56% | 2.47%
Market value of underlying collateral of a repurchase agreement | $ 301,684 | $ 700,498
FNMA and FHLMC [Member] |  |
Assets Sold Under Agreements To Repurchase Line Items |  |
Market value of underlying collateral of a repurchase agreement | 301,684 | 575,915
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 | 75,629
US Treasury Securities [Member] |  |
Assets Sold Under Agreements To Repurchase Line Items |  |
Market value of underlying collateral of a repurchase agreement | 0 | 48,954
Mturity less than 90 Days Member |  |
Assets Sold Under Agreements To Repurchase Line Items |  |
Assets Sold Under Agreements To Repurchase Repurchase Liability |  | $ 349,729
Assets Sold Under Agreements To Repurchase Interest Rate |  | 3.35%
Market value of underlying collateral of a repurchase agreement |  | $ 372,778
Mturity less than 90 Days Member | FNMA and FHLMC [Member] |  |
Assets Sold Under Agreements To Repurchase Line Items |  |
Assets Sold Under Agreements To Repurchase Repurchase Liability |  | 248,288
Mturity less than 90 Days Member | Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |
Assets Sold Under Agreements To Repurchase Line Items |  |
Assets Sold Under Agreements To Repurchase Repurchase Liability |  | 75,536
Mturity less than 90 Days Member | US Treasury Securities [Member] |  |
Assets Sold Under Agreements To Repurchase Line Items |  |
Assets Sold Under Agreements To Repurchase Repurchase Liability |  | 48,954
Maturity over 90 days |  |
Assets Sold Under Agreements To Repurchase Line Items |  |
Assets Sold Under Agreements To Repurchase Repurchase Liability | $ 282,500 | $ 302,500
Assets Sold Under Agreements To Repurchase Interest Rate | 1.56% | 1.44%
Market value of underlying collateral of a repurchase agreement | $ 301,684 | $ 327,720
Maturity over 90 days | FNMA and FHLMC [Member] |  |
Assets Sold Under Agreements To Repurchase Line Items |  |
Assets Sold Under Agreements To Repurchase Repurchase Liability | 301,684 | 327,627
Maturity over 90 days | Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |
Assets Sold Under Agreements To Repurchase Line Items |  |
Assets Sold Under Agreements To Repurchase Repurchase Liability | 0 | 93
Maturity over 90 days | US Treasury Securities [Member] |  |
Assets Sold Under Agreements To Repurchase Line Items |  |
Assets Sold Under Agreements To Repurchase Repurchase Liability | $ 0 | $ 0

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- 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 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 + Details
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- 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 + Details
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- 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 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 + Details
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