DEPOSITS AND RETAIL REPURCHASE AGREEMENTS DEPOSITS AND RETAIL REPURCHASE AGREEMENTS (Certificates of Deposit by Balance) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Time Deposits [Abstract]
Certificates of deposit less than or equal to the FDIC insured limit of $250,000	$ 602,025	$ 633,345
Certificates of deposit greater than the FDIC insured limit of $250,000	128,636	137,171
Total certificate accounts	$ 730,661	$ 770,516

Amount of interest-bearing domestic certificate of deposit liabilities.

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 210.9-03.12)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant