Retained Earnings and Regulatory Capital Requirements - Additional Information (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Distributions	$ 0
HNAI [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Contributions	$ 0

The cash inflow from parent as a source of financing that is recorded as additional paid in capital.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Name:	us-gaap_ProceedsFromContributionsFromParent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration