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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018
 
 
 
 
 
 
 
 
 
 
 
Leverage Ratio
 
 
 
 
 
 
 
 
 
 
 
S&T
$
689,778

 
10.05
%
 
$
274,497

 
4.00
%
 
$
343,121

 
5.00
%
S&T Bank
659,304

 
9.63
%
 
273,820

 
4.00
%
 
342,275

 
5.00
%
Common Equity Tier 1 (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
 
 
 
S&T
669,778

 
11.38
%
 
264,933

 
4.50
%
 
382,681

 
6.50
%
S&T Bank
659,304

 
11.23
%
 
264,127

 
4.50
%
 
381,517

 
6.50
%
Tier 1 Capital (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
 
 
 
S&T
689,778

 
11.72
%
 
353,244

 
6.00
%
 
470,992

 
8.00
%
S&T Bank
659,304

 
11.23
%
 
352,170

 
6.00
%
 
469,560

 
8.00
%
Total Capital (to Risk-Weighted Assets)
 
 
 
 
 
 
 
 
 
 
 
S&T
777,913

 
13.21
%
 
470,992

 
8.00
%
 
588,741

 
10.00
%
S&T Bank
747,438

 
12.73
%
 
469,560

 
8.00
%
 
586,950

 
10.00
%
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
%