Changes in Noncovered Other Real Estate Owned (Summary of Noncovered Other Real Estate Owned) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Other Real Estate Owned [Line Items]
Balance, beginning of period			$ 51,019
Proceeds from sale of OREO property			(11,899)	(7,874)
Gain (loss) on sale of OREO			6,277	5,455
Total OREO, end of period	33,004		33,004
Noncovered Loans [Member]
Other Real Estate Owned [Line Items]
Balance, beginning of period	16,744	26,081	22,893	30,991
Transfers in, net of write-downs ($0, $18, $118, and $108)	2,585	1,106	6,388	3,148
Transfers in, write-downs	0	18
OREO improvements	0	217	11	468
Additional OREO write-down	(2,052)	(2,536)	(3,774)	(4,446)
Proceeds from sale of OREO property	(4,069)	(2,502)	(11,899)	(7,874)
Gain (loss) on sale of OREO	717	373	306	452
Total OREO, end of period	$ 13,925	$ 22,739	$ 13,925	$ 22,739