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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2015
Banking and Thrift [Abstract]  
Summary of Risk-Based Capital Amounts and Ratios
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, 2015
 
 
 
 
 
 
 
 
Leverage Ratio
 
 
 
 
 
 
 
 
S&T
$
535,234

8.96
%
 
$
238,841

4.00
%
 
$
298,551

5.00
%
S&T Bank
502,114

8.43
%
 
238,121

4.00
%
 
297,651

5.00
%
Common Equity Tier 1 (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
S&T
515,234

9.77
%
 
237,315

4.50
%
 
342,788

6.50
%
S&T Bank
502,114

9.55
%
 
236,482

4.50
%
 
341,584

6.50
%
Tier 1 Capital (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
S&T
535,234

10.15
%
 
316,419

6.00
%
 
421,892

8.00
%
S&T Bank
502,114

9.55
%
 
315,309

6.00
%
 
420,412

8.00
%
Total Capital (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
S&T
611,859

11.60
%
 
421,892

8.00
%
 
527,366

10.00
%
S&T Bank
577,824

11.00
%
 
420,412

8.00
%
 
525,515

10.00
%
As of December 31, 2014
 
 
 
 
 
 
 
 
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
%
Common Equity Tier 1 (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
S&T
445,114

11.81
%
 
169,621

4.50
%
 
245,008

6.50
%
S&T Bank
403,593

10.76
%
 
168,804

4.50
%
 
243,827

6.50
%
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
%
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
%