REGULATORY CAPITAL AND OTHER REGULATORY MATTERS (Tables)

6 Months Ended

Jun. 30, 2015

Banking and Thrift [Abstract]

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

At June 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
	June 30, 2015					December 31, 2014
(dollars in thousands)	Amount			Ratio		Amount		Ratio
Total capital (to risk-weighted assets):
First Banks, Inc.	$	597,006		14.80	%	$	475,312	12.25	%	8.0	%	N/A		8.0	%	N/A
First Bank	681,126			16.79		691,350		17.81		8.0		10.0	%	8.0		10.0	%
Tier 1 capital (to risk-weighted assets):
First Banks, Inc.	296,436			7.35		284,396		7.33		6.0		N/A		4.0		N/A
First Bank	628,796			15.50		642,593		16.55		6.0		8.0		4.0		6.0
Common equity Tier 1 capital (to risk-weighted assets):
First Banks, Inc.	(34,251		)	(0.85	)	N/A		N/A		4.5		N/A		N/A		N/A
First Bank	628,796			15.50		N/A		N/A		4.5		6.5		N/A		N/A
Tier 1 capital (to average assets):
First Banks, Inc.	296,436			5.15		284,396		5.01		4.0		N/A		4.0		N/A
First Bank	628,796			10.87		642,593		11.35		4.0		5.0		4.0		5.0