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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2014
Banking and Thrift [Abstract]  
Summary of Risk-Based Capital Amounts and Ratios for S&T and S&T Bank
The following table summarizes risk-based capital amounts and ratios for S&T and S&T Bank.
 
Actual
 
Minimum
Regulatory Capital
Requirements
 
To be
Well Capitalized
Under Prompt
Corrective Action
Provisions
(dollars in thousands)
Amount

Ratio

 
Amount

Ratio

 
Amount

Ratio

As of December 31, 2014
 
 
 
 
 
 
 
 
Total Capital (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
S&T
$
537,935

14.27
%
 
$
301,548

8.00
%
 
$
376,936

10.00
%
S&T Bank
475,538

12.68
%
 
300,095

8.00
%
 
375,119

10.00
%
Tier 1 Capital (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
S&T
465,114

12.34
%
 
150,774

4.00
%
 
226,161

6.00
%
S&T Bank
403,593

10.76
%
 
150,048

4.00
%
 
225,071

6.00
%
Leverage Ratio(1)
 
 
 
 
 
 
 
 
S&T
465,114

9.80
%
 
189,895

4.00
%
 
237,369

5.00
%
S&T Bank
403,593

8.53
%
 
189,182

4.00
%
 
236,477

5.00
%
As of December 31, 2013
 
 
 
 
 
 
 
 
Total Capital (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
S&T
$
494,986

14.36
%
 
$
275,684

8.00
%
 
$
344,606

10.00
%
S&T Bank
457,540

13.35
%
 
274,257

8.00
%
 
342,821

10.00
%
Tier 1 Capital (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
S&T
426,234

12.37
%
 
137,842

4.00
%
 
206,763

6.00
%
S&T Bank
389,584

11.36
%
 
137,128

4.00
%
 
205,693

6.00
%
Leverage Ratio(1)
 
 
 
 
 
 
 
 
S&T
426,234

9.75
%
 
174,824

4.00
%
 
218,530

5.00
%
S&T Bank
389,584

8.95
%
 
174,081

4.00
%
 
217,601

5.00
%
(1)
Minimum requirement is 3.00 percent for the most highly rated financial institutions.