Regulatory Matters (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of minimum required capital amounts and ratios
Tier 1 capital (to risk-weighted assets), Required Ratio	4.00%
Total capital (to risk-weighted assets), Required Ratio	8.00%
PlainsCapital Bank [Member]
Schedule of minimum required capital amounts and ratios
Tier 1 capital (to average assets), Required Amount	$ 227,098	$ 219,660
Tier 1 capital (to average assets), Required Ratio	4.00%	4.00%
Tier 1 capital (to average assets), Actual Amount	570,720	536,274
Tier 1 capital (to average assets), Actual Ratio	10.05%	9.77%
Tier 1 capital (to risk-weighted assets), Required Amount	179,296	169,281
Tier 1 capital (to risk-weighted assets), Required Ratio	4.00%	4.00%
Tier 1 capital (to risk-weighted assets), Actual Amount	570,720	536,274
Tier 1 capital (to risk-weighted assets), Actual Ratio	12.73%	12.67%
Total capital (to risk-weighted assets), Required Amount	358,592	338,561
Total capital (to risk-weighted assets), Required Ratio	8.00%	8.00%
Total capital (to risk-weighted assets), Actual Amount	626,809	589,365
Total capital (to risk-weighted assets), Actual Ratio	13.98%	13.93%
PlainsCapital Corporation [Member]
Schedule of minimum required capital amounts and ratios
Tier 1 capital (to average assets), Required Amount	227,554	220,103
Tier 1 capital (to average assets), Required Ratio	4.00%	4.00%
Tier 1 capital (to average assets), Actual Amount	578,380	532,025
Tier 1 capital (to average assets), Actual Ratio	10.17%	9.67%
Tier 1 capital (to risk-weighted assets), Required Amount	179,756	169,740
Tier 1 capital (to risk-weighted assets), Required Ratio	4.00%	4.00%
Tier 1 capital (to risk-weighted assets), Actual Amount	578,380	532,025
Tier 1 capital (to risk-weighted assets), Actual Ratio	12.87%	12.54%
Total capital (to risk-weighted assets), Required Amount	359,511	339,480
Total capital (to risk-weighted assets), Required Ratio	8.00%	8.00%
Total capital (to risk-weighted assets), Actual Amount	$ 644,211	$ 596,057
Total capital (to risk-weighted assets), Actual Ratio	14.34%	14.05%

PLAINSCAPITAL CORP 10-Q