REGULATORY CAPITAL AND OTHER REGULATORY MATTERS (Tables)

9 Months Ended

Sep. 30, 2015

Banking and Thrift [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

At September 30, 2015 and December 31, 2014, the Company’s and First Bank’s required and actual capital ratios were as follows:

										Final Capital Rules (Effective January 1, 2015)				General Risk-Based Capital Rules (Prior to January 1, 2015)
												To be Well Capitalized Under Prompt Corrective Action Provisions				To be Well Capitalized Under Prompt Corrective Action Provisions
	Actual									For Capital Adequacy Purposes				For Capital Adequacy Purposes
	September 30, 2015					December 31, 2014
(dollars in thousands)	Amount			Ratio		Amount		Ratio
Total capital (to risk-weighted assets):
First Banks, Inc.	$	608,834		15.27	%	$	475,312	12.25	%	8.0	%	N/A		8.0	%	N/A
First Bank	682,301			17.01		691,350		17.81		8.0		10.0	%	8.0		10.0	%
Tier 1 capital (to risk-weighted assets):
First Banks, Inc.	311,829			7.82		284,396		7.33		6.0		N/A		4.0		N/A
First Bank	630,575			15.72		642,593		16.55		6.0		8.0		4.0		6.0
Common equity Tier 1 capital (to risk-weighted assets):
First Banks, Inc.	(25,346		)	(0.64	)	N/A		N/A		4.5		N/A		N/A		N/A
First Bank	630,575			15.72		N/A		N/A		4.5		6.5		N/A		N/A
Tier 1 capital (to average assets):
First Banks, Inc.	311,829			5.31		284,396		5.01		4.0		N/A		4.0		N/A
First Bank	630,575			10.69		642,593		11.35		4.0		5.0		4.0		5.0