Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2014

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, 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
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
As of December 31, 2013:
Total Capital (to Risk Weighted Assets)
Enterprise Financial Services Corp	$	339,433	13.78	%	$	197,088	8.00	%	$	—	—	%
Enterprise Bank & Trust	318,149		13.00		195,802		8.00		244,752		10.00
Tier 1 Capital (to Risk Weighted Assets)
Enterprise Financial Services Corp	308,490		12.52		98,544		4.00		—		—
Enterprise Bank & Trust	287,405		11.74		97,901		4.00		146,851		6.00
Tier 1 Capital (to Average Assets)
Enterprise Financial Services Corp	308,490		9.94		93,121		3.00		—		—
Enterprise Bank & Trust	287,405		9.31		92,587		3.00		154,312		5.00