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Borrowings and Related Interest (Schedule of Repurchase Agreements) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Assets sold under agreements to repurchase	$ 430,957	$ 454,723
Maturity Less Than 90 Days [Member]
Debt Instrument [Line Items]
Assets sold under agreements to repurchase	190,957	214,723
Maturity Over 90 days [Member]
Debt Instrument [Line Items]
Assets sold under agreements to repurchase	$ 240,000	$ 240,000
Minimum [Member] | Maturity Less Than 90 Days [Member]
Debt Instrument [Line Items]
Assets sold under agreements to repurchase, interest rate	2.45%	2.45%
Minimum [Member] | Maturity Over 90 days [Member]
Debt Instrument [Line Items]
Assets sold under agreements to repurchase, interest rate	1.72%	1.42%
Maximum [Member] | Maturity Less Than 90 Days [Member]
Debt Instrument [Line Items]
Assets sold under agreements to repurchase, interest rate	2.95%	2.95%
Maximum [Member] | Maturity Over 90 days [Member]
Debt Instrument [Line Items]
Assets sold under agreements to repurchase, interest rate	2.86%	2.86%

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://fasb.org/us-gaap/role/ref/legacyRef
-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

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://fasb.org/us-gaap/role/ref/legacyRef
-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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