Non-covered Other Real Estate Owned (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Other real estate, non covered [Roll Forward]
Balance, beginning of year	$ 1,976	$ 4,122
Additions to OREO	4,612	3,245
Dispositions of OREO, net	(2,721)	(5,119)
Valuation adjustments	(844)	(272)
Balance, end of period	$ 3,023	$ 1,976