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Shareholders Equity and Regulatory Matters - Schedule of comparison of the actual capital amounts and ratios (Details)
$ in Thousands
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk weighted assets), Actual, Amount $ 495,926  
Total capital (to risk weighted assets), Actual, Ratio 0.1231  
Total capital (to risk weighted assets), For Capital Adequacy Purposes, Amount $ 422,855  
Total capital (to risk weighted assets), For Capital Adequacy Purposes, Ratio 0.105  
Tier I capital (to risk weighted assets), Actual, Amount $ 378,232  
Tier I capital (to risk weighted assets), Actual, Ratio 0.0939  
Tier I capital (to risk weighted assets), For Capital Adequacy Purposes, Amount $ 342,312  
Tier I capital (to risk weighted assets), For Capital Adequacy Purposes, Ratio 0.085  
Tier I capital (to average assets), Actual, Amount $ 378,232  
Tier I capital (to average assets), Actual, Ratio 0.1017  
Tier I capital (to average assets), For Capital Adequacy Purposes, Amount $ 148,807  
Tier I capital (to average assets), For Capital Adequacy Purposes, Ratio 0.04  
Common equity tier 1 (to risk weighted assets), Actual, Amount $ 312,007  
Common equity tier 1 (to risk weighted assets), Actual, Ratio 0.0775  
Common equity tier 1 (to risk weighted assets), For Capital Adequacy Purposes, Amount $ 281,904  
Common equity tier 1 (to risk weighted assets), For Capital Adequacy Purposes, Ratio 0.07  
THIRD COAST BANK, SSB    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk weighted assets), Actual, Amount $ 522,418 $ 496,222
Total capital (to risk weighted assets), Actual, Ratio 0.1299 0.1379
Total capital (to risk weighted assets), For Capital Adequacy Purposes, Amount $ 422,302 $ 377,782
Total capital (to risk weighted assets), For Capital Adequacy Purposes, Ratio 0.105 0.105
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 402,192 $ 359,793
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 0.10 0.10
Tier I capital (to risk weighted assets), Actual, Amount $ 485,175 $ 465,871
Tier I capital (to risk weighted assets), Actual, Ratio 0.1206 0.1295
Tier I capital (to risk weighted assets), For Capital Adequacy Purposes, Amount $ 341,864 $ 305,824
Tier I capital (to risk weighted assets), For Capital Adequacy Purposes, Ratio 0.085 0.085
Tier I capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 321,754 $ 287,834
Tier I capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 0.08 0.08
Tier I capital (to average assets), Actual, Amount $ 485,175 $ 465,871
Tier I capital (to average assets), Actual, Ratio 0.1306 0.1311
Tier I capital (to average assets), For Capital Adequacy Purposes, Amount $ 148,624 $ 142,188
Tier I capital (to average assets), For Capital Adequacy Purposes, Ratio 0.04 0.04
Tier I capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 185,780 $ 177,734
Tier I capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 0.05 0.05
Common equity tier 1 (to risk weighted assets), Actual, Amount $ 485,175 $ 465,871
Common equity tier 1 (to risk weighted assets), Actual, Ratio 0.1206 0.1295
Common equity tier 1 (to risk weighted assets), For Capital Adequacy Purposes, Amount $ 281,535 $ 251,855
Common equity tier 1 (to risk weighted assets), For Capital Adequacy Purposes, Ratio 0.07 0.07
Common equity tier 1 (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 261,425 $ 233,865
Common equity tier 1 (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 0.065 0.065