SUBORDINATED DEBENTURES (Textual) (Details) (USD $)	12 Months Ended								12 Months Ended			1 Months Ended	3 Months Ended
	Dec. 31, 2013 installment trust	Dec. 31, 2012	Dec. 31, 2011	Aug. 10, 2009	Dec. 31, 2013 Regularly Scheduled Deferred Interest Payments Accrued	Dec. 31, 2012 Regularly Scheduled Deferred Interest Payments Accrued	Dec. 31, 2013 Additional Deferred Interest Payments Accrued	Dec. 31, 2012 Additional Deferred Interest Payments Accrued	Dec. 31, 2013 Parent Company [Member]	Dec. 31, 2012 Parent Company [Member]	Dec. 31, 2011 Parent Company [Member]	Feb. 10, 2014 Subsequent Event [Member] Parent Company [Member]	Mar. 14, 2014 Junior Subordinated Debt [Member] Subsequent Event [Member]
Subordinated Borrowings [Abstract]
Number of trusts created for issuing trust preferred securities	13
Percent of principal amount callable at call date	100.00%
Distributions accrued on junior subordinated debentures	$ 15,000,000	$ 14,800,000	$ 13,500,000
Trust preferred securities value				345,000,000
Number of quarterly periods for deferral of cash interest payments on junior subordinated debt	18
Statement [Line Items]
Interest payable					56,000,000	43,800,000	6,700,000	3,900,000	62,855,000	47,878,000
Cash Dividends Paid to First Banks, Inc. by First Bank												70,000,000
Deferred interest paid by First Banks, Inc. on the junior subordinated debentures to the respective trustees for further distribution to the trust preferred securities holders on the interest payment dates in March and April 2014	$ 9,540,000	$ 17,493,000	$ 35,723,000						$ 0	$ 0	$ 0		$ 66,400,000