Covered Assets and FDIC Loss-sharing Asset (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2011
Percentage of loss assumed by FDIC on sale of covered OREO	80.00%
Percentage of loss assumed by FDIC on sale of covered OREO if minimum loss share is met	95.00%
Percentage of loss recovery agreement	95.00%
Percentage of Clawback	50.00%
Percentage of stated threshold	20.00%
Percentage of assets premium	25.00%
Amount of estimated clawback liability	$ 2,100,000
Provision expense on covered loans	1,900,000
Impairment expenses	2,300,000
Negative provision to adjust allowance for loss	462,000
Noninterest income	1,500,000
Federal deposit insurance corporation loss-sharing indemnified assets	199,300,000
Federal deposit insurance corporation loss-sharing indemnified assets receivable	$ 6,900,000
Maximum [Member]
Loss sharing agreement effective years	10
Loss recovery provision effective years	10
Percentage of cumulative loss-sharing	25.00%
Minimum [Member]
Loss sharing agreement effective years	5
Loss recovery provision effective years	8
Percentage of cumulative loss-sharing	20.00%