CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Total	First Banks, Inc. Stockholders’ Equity, Preferred Stock [Member]	First Banks, Inc. Stockholders’ Equity, Common Stock [Member]	First Banks, Inc. Stockholders’ Equity, Additional Paid-In Capital [Member]	First Banks, Inc. Stockholders’ Equity, Retained Earnings (Deficit) [Member]	First Banks, Inc. Stockholders’ Equity, Accumulated Other Comprehensive Income [Member]	Noncontrolling Interest [Member]
Balance, beginning of period at Dec. 31, 2012	$ 299,959	$ 322,163	$ 5,915	$ 12,480	$ (179,513)	$ 45,259	$ 93,655
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	16,324				16,173		151
Other comprehensive income (loss)	(35,656)					(35,656)
Accretion of discount on preferred stock		1,806			(1,806)
Preferred stock dividends declared	(9,828)				(9,828)
Balance, end of period at Jun. 30, 2013	270,799	323,969	5,915	12,480	(174,974)	9,603	93,806
Balance, beginning of period at Dec. 31, 2013	488,256	325,806	5,915	12,480	42,719	7,502	93,834
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,582				10,636		(54)
Other comprehensive income (loss)	7,390					7,390
Balance, end of period at Jun. 30, 2014	$ 506,228	$ 325,806	$ 5,915	$ 12,480	$ 53,355	$ 14,892	$ 93,780