Changes in Noncovered Other Real Estate Owned (Summary of Noncovered Other Real Estate Owned) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other Real Estate Owned [Line Items]
Balance, beginning of period	$ 26,987
Proceeds from sale of OREO property	(2,019)	(7,829)
Gain (loss) on sale of OREO	2,787	2,954
Total OREO, end of period	25,727
Noncovered Loans [Member]
Other Real Estate Owned [Line Items]
Balance, beginning of period	10,676	22,893
Transfers in, net of write-downs ($32 and $118)	2,709	3,803
Transfers in, write-downs	32	118
OREO improvements	0	11
Additional OREO write-down	(93)	(1,722)
Proceeds from sale of OREO property	(1,565)	(7,829)
Gain (loss) on sale of OREO	189	(412)
Total OREO, end of period	$ 11,916	$ 16,744