Acquisitions (Details 2) (SWS, USD $)	0 Months Ended
	Jan. 01, 2015	Jan. 01, 2015
Acquisitions
Carryover of Allowance for Loan and Lease Losses, Loans Acquired	$ 0
Total loans	863,819,000	863,819,000
Commercial and industrial
Acquisitions
Total loans	457,809,000	457,809,000
Real estate
Acquisitions
Total loans	386,695,000	386,695,000
Construction and land development
Acquisitions
Total loans	16,099,000	16,099,000
Consumer
Acquisitions
Total loans	3,216,000	3,216,000
Loans excluding PCI Loans
Acquisitions
Total loans	790,360,000	790,360,000
Loans excluding PCI Loans | Commercial and industrial
Acquisitions
Total loans	447,959,000	447,959,000
Amount of margin loans to customers and correspondents included in the portfolio segment	269,400,000	269,400,000
Loans excluding PCI Loans | Real estate
Acquisitions
Total loans	324,477,000	324,477,000
Loans excluding PCI Loans | Construction and land development
Acquisitions
Total loans	14,708,000	14,708,000
Loans excluding PCI Loans | Consumer
Acquisitions
Total loans	3,216,000	3,216,000
PCI loans
Acquisitions
Total loans	73,459,000	73,459,000
PCI loans | Commercial and industrial
Acquisitions
Total loans	9,850,000	9,850,000
PCI loans | Real estate
Acquisitions
Total loans	62,218,000	62,218,000
PCI loans | Construction and land development
Acquisitions
Total loans	$ 1,391,000	$ 1,391,000