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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016
 
 
 
 
 
 
 
 
Leverage Ratio
 
 
 
 
 
 
 
 
S&T
$
582,155

8.98
%
 
$
259,170

4.00
%
 
$
323,963

5.00
%
S&T Bank
542,048

8.39
%
 
258,460

4.00
%
 
323,075

5.00
%
Common Equity Tier 1 (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
S&T
562,155

10.04
%
 
252,079

4.50
%
 
364,114

6.50
%
S&T Bank
542,048

9.71
%
 
251,213

4.50
%
 
362,864

6.50
%
Tier 1 Capital (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
S&T
582,155

10.39
%
 
336,105

6.00
%
 
448,140

8.00
%
S&T Bank
542,048

9.71
%
 
334,951

6.00
%
 
446,601

8.00
%
Total Capital (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
S&T
664,184

11.86
%
 
448,140

8.00
%
 
560,175

10.00
%
S&T Bank
622,469

11.15
%
 
446,602

8.00
%
 
558,252

10.00
%
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
%