The number of derivative instruments of a particular group held by the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959

Name:	us-gaap_DerivativeNumberOfInstrumentsHeld
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Derivatives - narrative items (Details)	3 Months Ended
Derivatives - narrative items (Details)	Sep. 30, 2014	Dec. 31, 2014
Minimum [Member]
Derivatives Fair Value [Line Items]
Credit derivative term	0 years
Maximum [Member]
Derivatives Fair Value [Line Items]
Credit derivative term	5 years
Designated as Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Derivative number of instruments held		0