Noncovered Other Real Estate Owned (Summary of Noncovered Other Real Estate Owned) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Real Estate Owned [Line Items]
Balance, beginning of period	$ 51,019
Proceeds from sale of OREO property	(15,689)	(12,278)	(4,800)
Net realized gain on sale of other real estate owned	11,634	9,310	5,253
Balance, end of period	26,987	51,019
Noncovered Loans [Member]
Other Real Estate Owned [Line Items]
Balance, beginning of period	22,893	30,991
Transfers in, net of write-downs ($205 and $315, respectively)	7,461	8,834
Writedowns Previously Recorded On Transfer In Of Real Estate Acquired Through Foreclosure	205	315
OREO improvements	11	730
Additional OREO write-downs	(4,816)	(5,641)
Proceeds from sale of OREO property	(15,689)	(12,278)
Net realized gain on sale of other real estate owned	816	257
Balance, end of period	$ 10,676	$ 22,893