Stock-Based Compensation (Details) (USD $)	6 Months Ended
Stock-Based Compensation (Details) (USD $)	Jun. 30, 2012
Unvested Restricted Stock [Member]
Schedule of information regarding unvested restricted stock and restricted stock units
Outstanding, January 1	528,532
Weighted Average Grant Date Fair Value, Outstanding, January 1	$ 11.45
Granted	7,497
Weighted Average Grant Date Fair Value, Granted	$ 15.18
Vested	(84,753)
Weighted Average Grant Date Fair Value, Vested	$ 11.33
Cancellations and Expirations
Weighted Average Grant Date Fair Value, Cancellations and expirations	$ 0.00
Outstanding, June 30	451,276
Weighted Average Grant Date Fair Value, Outstanding, June 30	$ 11.53
Restricted Stock Units [Member]
Schedule of information regarding unvested restricted stock and restricted stock units
Outstanding, January 1	590,149
Weighted Average Grant Date Fair Value, Outstanding, January 1	$ 11.91
Granted	344,811
Weighted Average Grant Date Fair Value, Granted	$ 14.00
Vested
Weighted Average Grant Date Fair Value, Vested	$ 0.00
Cancellations and Expirations	(3,500)
Weighted Average Grant Date Fair Value, Cancellations and expirations	$ 12.07
Outstanding, June 30	931,460
Weighted Average Grant Date Fair Value, Outstanding, June 30	$ 12.68

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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PLAINSCAPITAL CORP 10-Q