Regulatory Matters

12 Months Ended

Dec. 31, 2017

Regulated Operations [Abstract]

Regulatory Matters

REGULATORY MATTERS

Quantitative measures established by regulation to ensure capital adequacy require the Bank to maintain minimum amounts and ratios (set forth in the following table) of total, tier 1, and common equity tier 1 capital to risk-weighted assets, and of tier 1 capital to average assets. Management believes, as of December 31, 2017 and 2016, that the Company met all capital adequacy requirements to which it is subject.

As of December 31, 2017 and 2016, the Bank was categorized as “well capitalized” under the regulatory framework for prompt corrective action. To be categorized as “well capitalized” the Bank must maintain minimum total risk-based capital, tier 1 risk-based capital, common equity tier 1 risk-based capital, and tier 1 leverage ratios as set forth in the table.

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, 2017:
Total Capital (to Risk Weighted Assets)
Enterprise Financial Services Corp	$	589,047	12.21	%	$	385,816	8.00	%	$	—	—	%
Enterprise Bank & Trust	546,314		11.36		384,791		8.00		480,989		10.00
Tier 1 Capital (to Risk Weighted Assets)
Enterprise Financial Services Corp	496,045		10.29		289,362		6.00		—		—
Enterprise Bank & Trust	503,312		10.46		288,593		6.00		384,791		8.00
Common Equity Tier 1 Capital (to Risk Weighted Assets)
Enterprise Financial Services Corp	428,397		8.88		217,021		4.50		—		—
Enterprise Bank & Trust	503,264		10.46		216,445		4.50		312,643		6.50
Leverage Ratio (Tier 1 Capital to Average Assets)
Enterprise Financial Services Corp	496,045		9.72		204,087		4.00		—		—
Enterprise Bank & Trust	503,312		9.68		207,885		4.00		259,856		5.00
As of December 31, 2016:
Total Capital (to Risk Weighted Assets)
Enterprise Financial Services Corp	$	506,349	13.48	%	$	300,573	8.00	%	$	—	—	%
Enterprise Bank & Trust	430,981		11.53		298,982		8.00		373,728		10.00
Tier 1 Capital (to Risk Weighted Assets)
Enterprise Financial Services Corp	412,865		10.99		225,430		6.00		—		—
Enterprise Bank & Trust	387,497		10.37		224,237		6.00		298,982		8.00
Common Equity Tier 1 Capital (to Risk Weighted Assets)
Enterprise Financial Services Corp	357,729		9.52		169,072		4.50		—		—
Enterprise Bank & Trust	387,461		10.37		168,178		4.50		242,923		6.50
Leverage Ratio (Tier 1 Capital to Average Assets)
Enterprise Financial Services Corp	412,865		10.42		158,480		4.00		—		—
Enterprise Bank & Trust	387,497		9.81		157,933		4.00		197,417		5.00