Subsequent Events (Details) - Patriot Bancshares Inc [Member] $ in Thousands, shares in Millions		3 Months Ended	9 Months Ended
	Oct. 01, 2015 USD ($) location shares	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill, deductible for tax purposes	$ 0
Expenses related to the merger		$ 808	$ 2,700
Subsequent Event [Member]
Business Acquisition [Line Items]
Total assets	1,400,000
Total loans	1,100,000
Total deposits	1,100,000
Total shareholders equity	$ 125,200,000
Shares issued | shares	10.4
Preferred stock value	$ 27,300
Subsequent Event [Member] | Fannin County Texas [Member]
Business Acquisition [Line Items]
Number of locations in acquired entity | location	1
Subsequent Event [Member] | Dallas [Member]
Business Acquisition [Line Items]
Number of locations in acquired entity | location	2
Subsequent Event [Member] | Houston [Member]
Business Acquisition [Line Items]
Number of locations in acquired entity | location	6