Subsequent Events (Details) (USD $)					0 Months Ended		0 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Oct. 17, 2014 SP Bancorp Inc And Its Wholly Owned Subsidiary Share Plus Bank [Member]	Sep. 30, 2014 SP Bancorp Inc And Its Wholly Owned Subsidiary Share Plus Bank [Member]	Oct. 17, 2014 Subsequent Event [Member] SP Bancorp Inc And Its Wholly Owned Subsidiary Share Plus Bank [Member] item	Oct. 17, 2014 Subsequent Event [Member] SP Bancorp Inc And Its Wholly Owned Subsidiary Share Plus Bank [Member] Plano Texas item	Oct. 17, 2014 Subsequent Event [Member] SP Bancorp Inc And Its Wholly Owned Subsidiary Share Plus Bank [Member] Dallas Texas [Member] item	Oct. 17, 2014 Subsequent Event [Member] SP Bancorp Inc And Its Wholly Owned Subsidiary Share Plus Bank [Member] KENTUCKY [Member] item	Sep. 30, 2014 SP Bancorp Inc And Its Wholly Owned Subsidiary Share Plus Bank [Member]
Number of branches							4	2	1	1
Assets	$ 1,876,742,000	$ 1,703,127,000									$ 348,700,000
Loans	1,489,736,000	1,343,054,000									248,200,000
Deposits	1,577,691,000	1,447,372,000									280,500,000
Stockholders' equity	285,964,000	199,218,000	196,373,000	188,211,000							33,700,000
Cash for common stock					46,200,000
Pre-tax merger related expense						$ 885,000