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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017
 
 
 
 
 
 
 
 
 
 
 
Leverage Ratio
 
 
 
 
 
 
 
 
 
 
 
S&T
$
628,876

 
9.17
%
 
$
274,254

 
4.00
%
 
$
342,818

 
5.00
%
S&T Bank
582,929

 
8.52
%
 
273,538

 
4.00
%
 
341,922

 
5.00
%
Common Equity Tier 1 (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
 
 
 
S&T
608,876

 
10.71
%
 
255,778

 
4.50
%
 
369,457

 
6.50
%
S&T Bank
582,929

 
10.29
%
 
255,024

 
4.50
%
 
368,368

 
6.50
%
Tier 1 Capital (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
 
 
 
S&T
628,876

 
11.06
%
 
341,037

 
6.00
%
 
454,717

 
8.00
%
S&T Bank
582,929

 
10.29
%
 
340,032

 
6.00
%
 
453,375

 
8.00
%
Total Capital (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
 
 
 
S&T
713,056

 
12.55
%
 
454,717

 
8.00
%
 
568,396

 
10.00
%
S&T Bank
666,560

 
11.76
%
 
453,375

 
8.00
%
 
566,719

 
10.00
%
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
%