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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, 2018	Dec. 31, 2017
Financial Instruments Owned And Pledged As Collateral Type [Domain]
Assets Sold Under Agreements To Repurchase Line Items
Assets Sold Under Agreements To Repurchase Repurchase Liability	$ 377,808	$ 192,500
Assets Sold Under Agreements To Repurchase Interest Rate	2.31%	1.63%
Market value of underlying collateral of a repurchase agreement	$ 402,225	$ 205,483
FNMA and FHLMC [Member]
Assets Sold Under Agreements To Repurchase Line Items
Market value of underlying collateral of a repurchase agreement	402,225	205,483
Mturity less than 90 Days Member | Financial Instruments Owned And Pledged As Collateral Type [Domain]
Assets Sold Under Agreements To Repurchase Line Items
Assets Sold Under Agreements To Repurchase Repurchase Liability	$ 137,808	$ 0
Assets Sold Under Agreements To Repurchase Interest Rate	2.34%	0.00%
Market value of underlying collateral of a repurchase agreement	$ 145,429	$ 0
Mturity less than 90 Days Member | FNMA and FHLMC [Member]
Assets Sold Under Agreements To Repurchase Line Items
Market value of underlying collateral of a repurchase agreement	145,429	0
Maturity over 90 days | Financial Instruments Owned And Pledged As Collateral Type [Domain]
Assets Sold Under Agreements To Repurchase Line Items
Assets Sold Under Agreements To Repurchase Repurchase Liability	$ 240,000	$ 192,500
Assets Sold Under Agreements To Repurchase Interest Rate	2.30%	1.63%
Market value of underlying collateral of a repurchase agreement	$ 256,796	$ 205,483
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	$ 256,796	$ 205,483

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 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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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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 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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