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Regulatory Matters - Minimum Capital Requirements (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
PlainsCapital    
Tier 1 capital (to average assets)    
Actual Amount $ 1,150,229 $ 1,108,484
Actual Ratio (as a percent) 12.18% 12.35%
Minimum Capital Requirement Including Conservation Buffer in effect at end of period, ratio (as a percent) 4.00% 4.00%
Minimum Capital Requirement Including Conservation Buffer fully phased-in, ratio (as a percent) 4.00% 4.00%
To Be Well Capitalized Minimum Capital Requirements, Ratio (as a percent) 5.00% 5.00%
Common equity Tier 1 capital (to risk weighted assets)    
Actual Amount $ 1,150,229 $ 1,108,484
Actual Ratio (as a percent) 14.44% 14.64%
Minimum Capital Requirement Including Conservation Buffer in effect at end of period, ratio (as a percent) 5.75% 5.125%
Minimum Capital Requirement Including Conservation Buffer fully phased-in, ratio (as a percent) 7.00% 7.00%
To Be Well Capitalized Minimum Capital Requirements, Ratio (as a percent) 6.50% 6.50%
Tier 1 capital (to risk-weighted assets)    
Actual Amount $ 1,150,229 $ 1,108,484
Actual Ratio (as a percent) 14.44% 14.64%
Minimum Capital Requirement Including Conservation Buffer in effect at end of period, ratio (as a percent) 7.25% 6.625%
Minimum Capital Requirement Including Conservation Buffer fully phased-in, ratio (as a percent) 8.50% 8.50%
To Be Well Capitalized Minimum Capital Requirements, Ratio (as a percent) 8.00% 8.00%
Total capital (to risk-weighted assets)    
Actual Amount $ 1,213,069 $ 1,164,767
Actual Ratio (as a percent) 15.23% 15.38%
Minimum Capital Requirement Including Conservation Buffer in effect at end of period, ratio (as a percent) 9.25% 8.625%
Minimum Capital Requirement Including Conservation Buffer fully phased-in, ratio (as a percent) 10.50% 10.50%
To Be Well Capitalized Minimum Capital Requirements, Ratio (as a percent) 10.00% 10.00%
Hilltop    
Tier 1 capital (to average assets)    
Actual Amount $ 1,682,910 $ 1,652,101
Actual Ratio (as a percent) 12.87% 13.51%
Minimum Capital Requirement Including Conservation Buffer in effect at end of period, ratio (as a percent) 4.00% 4.00%
Minimum Capital Requirement Including Conservation Buffer fully phased-in, ratio (as a percent) 4.00% 4.00%
Common equity Tier 1 capital (to risk weighted assets)    
Actual Amount $ 1,633,561 $ 1,602,400
Actual Ratio (as a percent) 17.66% 18.30%
Minimum Capital Requirement Including Conservation Buffer in effect at end of period, ratio (as a percent) 5.75% 5.125%
Minimum Capital Requirement Including Conservation Buffer fully phased-in, ratio (as a percent) 7.00% 7.00%
Tier 1 capital (to risk-weighted assets)    
Actual Amount $ 1,682,910 $ 1,652,101
Actual Ratio (as a percent) 18.20% 18.87%
Minimum Capital Requirement Including Conservation Buffer in effect at end of period, ratio (as a percent) 7.25% 6.625%
Minimum Capital Requirement Including Conservation Buffer fully phased-in, ratio (as a percent) 8.50% 8.50%
Total capital (to risk-weighted assets)    
Actual Amount $ 1,730,164 $ 1,693,240
Actual Ratio (as a percent) 18.71% 19.34%
Minimum Capital Requirement Including Conservation Buffer in effect at end of period, ratio (as a percent) 9.25% 8.625%
Minimum Capital Requirement Including Conservation Buffer fully phased-in, ratio (as a percent) 10.50% 10.50%