Borrowings - Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total	$ 490,876	$ 597,847
Amounts related to securities sold under agreements to repurchase not included in offsetting disclosure in Footnote 10	9,000
Securities sold under agreements to repurchase
Debt Instrument [Line Items]
Overnight and continuous	0
Up to 30 Days	0
30-90 Days	0
Greater than 90 Days	9,000
Total	$ 9,000

Long-Term Debt, Maturities, Repayments Of Principal Between Thirty And Ninety Days

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Long-Term Debt, Maturities, Repayments Of Principal Greater Than Ninety Days

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Long-Term Debt, Maturities, Repayments Of Principal Overnight And Continuous

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Long-Term Debt, Maturities, Repayments Of Principal Up To Thirty Days

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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.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

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Amount 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, not subject to a master netting arrangement.

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Reference 1: 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

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