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Regulatory Matters - Minimum Capital Requirements (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Regulatory matters    
Regulatory capital effects from CECL transitionary period 5 years  
Plains Capital Bank    
Tier 1 capital (to average assets)    
Actual Amount $ 1,404,288 $ 1,469,695
Actual Ratio 0.1029 0.1020
Minimum Capital Requirement Including Conservation Buffer fully phased-in, ratio 0.040  
To Be Well Capitalized Minimum Capital Requirements, Ratio 0.050  
Common equity Tier 1 capital (to risk weighted assets)    
Actual Amount $ 1,404,288 $ 1,469,695
Actual Ratio 0.1468 0.1600
Minimum Capital Requirement Including Conservation Buffer fully phased-in, ratio 0.070  
To Be Well Capitalized Minimum Capital Requirements, Ratio 0.065  
Tier 1 capital (to risk-weighted assets)    
Actual Amount $ 1,404,288 $ 1,469,695
Actual Ratio 0.1468 0.1600
Minimum Capital Requirement Including Conservation Buffer fully phased-in, ratio 0.085  
To Be Well Capitalized Minimum Capital Requirements, Ratio 0.080  
Total capital (to risk-weighted assets)    
Actual Amount $ 1,486,989 $ 1,540,100
Actual Ratio 0.1554 0.1677
Minimum Capital Requirement Including Conservation Buffer fully phased-in ratio 0.105  
To Be Well Capitalized Minimum Capital Requirements, Ratio 0.100  
Hilltop    
Tier 1 capital (to average assets)    
Actual Amount $ 1,881,289 $ 2,262,356
Actual Ratio 0.1141 0.1258
Minimum Capital Requirement Including Conservation Buffer fully phased-in, ratio 0.040  
Common equity Tier 1 capital (to risk weighted assets)    
Actual Amount $ 1,881,289 $ 2,262,356
Actual Ratio 0.1745 0.2122
Minimum Capital Requirement Including Conservation Buffer fully phased-in, ratio 0.070  
Tier 1 capital (to risk-weighted assets)    
Actual Amount $ 1,881,289 $ 2,262,356
Actual Ratio 0.1745 0.2122
Minimum Capital Requirement Including Conservation Buffer fully phased-in, ratio 0.085  
Total capital (to risk-weighted assets)    
Actual Amount $ 2,163,815 $ 2,532,008
Actual Ratio 0.2007 0.2375
Minimum Capital Requirement Including Conservation Buffer fully phased-in ratio 0.105