Covered Assets and FDIC Loss-sharing Asset (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Amount of Estimated Clawback Liability	$ 3,800,000		$ 3,800,000
Payment Of Clawback If Losses Less Than Stated Levels, Period After Acquisition			10 years 45 days
Provision for loan and lease losses			3,581,000	34,506,000
Federal deposit insurance corporation loss-sharing indemnified assets	48,400,000		48,400,000
Federal deposit insurance corporation loss-sharing indemnified assets receivable	5,200,000		5,200,000
FDIC Loss-sharing Asset, Period Increase (Decrease)	1,300,000
Covered Loans [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Percentage of loss shared by FDIC	80.00%		80.00%
FDIC Percentage Of Loss Recoveries	80.00%		80.00%
Percentage of loss shared by FDIC When Loss Share Thresholds Met	95.00%		95.00%
Percentage Of Loss Recoveries Shared By FDIC When Loss Share Thresholds Met	95.00%		95.00%
Provision for loan and lease losses	(947,000)	(3,992,000)	(1,679,000)	23,381,000
Impairment expenses			929,000
Negative provision to adjust allowance for loss			$ 750,000
Covered Loans [Member] | Maximum [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Loss Sharing Agreement Effective Years			10 years
Loss Recovery Provision Effective Years			10 years
Covered Loans [Member] | Minimum [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Loss Sharing Agreement Effective Years			5 years
Loss Recovery Provision Effective Years			8 years