Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

Name:	us-gaap_StockRepurchasedDuringPeriodShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

SHAREHOLDERS' EQUITY (Details) - USD ($)	3 Months Ended		12 Months Ended
SHAREHOLDERS' EQUITY (Details) - USD ($)	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Apr. 28, 2015	Dec. 17, 2013	Feb. 27, 2013
Participation in the TARP Capital Purchase Program
Number of shares authorized to be repurchased	$ 77,000						$ 600,000	$ 600,000
Number of additional shares authorized to be repurchased						$ 750,000,000
Shares of Common Stock
Participation in the TARP Capital Purchase Program
Number of shares repurchased	9,000	22,500	102,455	13,700	55,594