Changes in Noncovered Other Real Estate Owned (Summary of Noncovered Other Real Estate Owned) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended		15 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012
Other Real Estate Owned [Line Items]
Balance, beginning of period		$ 51,019
Proceeds from sale of OREO property		(15,069)	(10,234)
Gain (loss) on sale of OREO		8,604	7,069
Total OREO, end of period	27,386	27,386		27,386
Noncovered Loans [Member]
Other Real Estate Owned [Line Items]
Balance, beginning of period	13,925	22,893	30,991	22,739
Transfers in, net of write-downs ($24, $0, $24, and $108)	139	6,527	8,434	5,287
Transfers in, write-downs	24			0
OREO improvements	0	11	726	257
Additional OREO write-down	(458)	(4,232)	(5,090)	(644)
Proceeds from sale of OREO property	(3,170)	(15,069)	(10,234)	(2,359)
Gain (loss) on sale of OREO	439	745	229	(224)
Total OREO, end of period	$ 10,875	$ 10,875	$ 25,056	$ 10,875