Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2015

Regulated Operations [Abstract]

Schedule of Actual Capital Amounts and Ratios

The actual capital amounts and ratios are presented in the table below:

	Actual				For Capital Adequacy Purposes				To Be Well Capitalized  Under Applicable Action Provisions
(in thousands)	Amount		Ratio		Amount		Ratio		Amount		Ratio
As of December 31, 2015:
Total Capital (to Risk Weighted Assets)
Enterprise Financial Services Corp	$	418,367	11.85	%	$	282,442	8.00	%	$	—	—	%
Enterprise Bank & Trust	386,531		10.98		281,632		8.00		352,040		10.00
Tier 1 Capital (to Risk Weighted Assets)
Enterprise Financial Services Corp	374,676		10.61		211,831		6.00		—		—
Enterprise Bank & Trust	342,840		9.74		211,224		6.00		281,632		8.00
Common Equity Tier 1 Capital (to Risk Weighted Assets)1
Enterprise Financial Services Corp	319,553		9.05		158,873		4.50		—		—
Enterprise Bank & Trust	342,816		9.74		158,418		4.50		228,826		6.50
Leverage Ratio (Tier 1 Capital to Average Assets)
Enterprise Financial Services Corp	374,676		10.71		139,893		4.00		—		—
Enterprise Bank & Trust	342,840		9.84		139,311		4.00		174,138		5.00
As of December 31, 2014:
Total Capital (to Risk Weighted Assets)
Enterprise Financial Services Corp	$	369,868	13.40	%	$	220,858	8.00	%	$	—	—	%
Enterprise Bank & Trust	343,334		12.51		219,645		8.00		274,556		10.00
Tier 1 Capital (to Risk Weighted Assets)
Enterprise Financial Services Corp	335,221		12.14		110,429		4.00		—		—
Enterprise Bank & Trust	308,874		11.25		109,823		4.00		164,734		6.00
Leverage Ratio (Tier 1 Capital to Average Assets)
Enterprise Financial Services Corp	335,221		10.48		96,000		3.00		—		—
Enterprise Bank & Trust	308,874		9.71		95,411		3.00		159,018		5.00
1 Not an applicable regulatory ratio until implementation of Basel III in 2015