Covered Assets and Indemnification Asset (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	9 Months Ended
	Sep. 13, 2013	Sep. 30, 2013
Covered loans
Covered assets and indemnification asset
Total covered loans		$ 1,096,590
Covered loans | Commercial and Industrial
Covered assets and indemnification asset
Total covered loans		74,581
Covered loans | Real estate
Covered assets and indemnification asset
Total covered loans		833,493
Covered loans | Construction and Land Development
Covered assets and indemnification asset
Total covered loans		188,505
Covered loans | Consumer
Covered assets and indemnification asset
Total covered loans		11
Covered loans | Acquired loans
Covered assets and indemnification asset
Fair value of loans acquired	1,100,000
Carryover of the allowance for loan losses recorded	0
Bank | FNB
Covered assets and indemnification asset
Period for which payment is required to be made to the FDIC of true-up amount		10 years
Fair value of loans acquired	1,151,336
Carryover of the allowance for loan losses recorded	0
Bank | FNB | Commercial and Industrial
Covered assets and indemnification asset
Fair value of loans acquired	94,912
Bank | FNB | Real estate
Covered assets and indemnification asset
Fair value of loans acquired	841,478
Bank | FNB | Construction and Land Development
Covered assets and indemnification asset
Fair value of loans acquired	189,938
Bank | FNB | Consumer
Covered assets and indemnification asset
Fair value of loans acquired	$ 25,008