Commitments and Contingencies (Details) (USD $)		0 Months Ended				3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2013 item	Sep. 13, 2013 Bank FNB item	Sep. 13, 2013 Bank FNB Covered loans Commercial	Sep. 13, 2013 Bank FNB Covered loans Single family residential loans	Sep. 13, 2013 Bank FNB Maximum	Sep. 30, 2013 Representation and Warranty Specific Claims Activity -Origination Loan Balance	Sep. 30, 2013 Representation and Warranty Specific Claims Activity -Origination Loan Balance	Sep. 30, 2013 Reserve for Indemnification liability established by mortgage origination segment	Sep. 30, 2013 Reserve for Indemnification liability established by mortgage origination segment
Commitments and Contingencies
Number of Legal actions expected to have a material adverse effect on the entity	0
Indemnification liability reserve						$ 48,382,000	$ 48,382,000	$ 21,027,000	$ 21,027,000
Provision for indemnification losses								900,000	2,800,000
Number of loss-sharing agreements		2
Roll-forward of claims activity for loans put-back to the mortgage origination segment
Balance, beginning of period						46,090,000	39,693,000	20,397,000	18,964,000
Claims made						6,769,000	25,844,000
Additions for new sales								878,000	2,834,000
Claims resolved with no payment						(2,338,000)	(10,751,000)
Repurchases						(1,597,000)	(3,917,000)	(120,000)	(129,000)
Early payment defaults								(165,000)	(397,000)
Indemnification payments						(542,000)	(2,487,000)	(177,000)	(701,000)
Change in estimate								214,000	456,000
Balance, end of period						48,382,000	48,382,000	21,027,000	21,027,000
Reserve for Indemnification Liability:
Specific claims								12,336,000	12,336,000
Incurred but not reported claims								8,691,000	8,691,000
Total						48,382,000	48,382,000	21,027,000	21,027,000
Loans and OREO acquired		1,200,000,000
Percentage of losses to be absorbed by FDIC on the first $240.4 million of losses incurred as per the loss sharing agreement		80.00%
Threshold amount of losses incurred for 80% of losses to be absorbed by FDIC as per the loss sharing agreement, first layer		240,400,000
Percentage of losses to be absorbed by FDIC in excess of $240.4 million up to and including $365.7 million of losses incurred as per the loss sharing agreement		0.00%
Threshold amount of losses incurred for 0% of losses to be absorbed by FDIC as per the loss sharing agreement, second layer					$ 365,700,000
Percentage of losses to be absorbed by FDIC in excess of $365.7 million of losses incurred as per the loss sharing agreement		80.00%
Period of loss-sharing agreements in effect			5 years	10 years
Period of loss recovery provisions in effect			8 years	10 years
Period for which payment is required to be made to the FDIC of true-up amount		10 years