Fair Value Measurements (Details 4) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
OREO covered under loss-share agreements:
OREO covered under loss-share agreements, Fair value	$ 14,801	$ 5,585
OREO not covered under loss-share agreements:
OREO not covered under loss-share agreements, Fair value	19,155	18,360
Carrying amount prior to remeasurement [Member]
OREO covered under loss-share agreements:
OREO covered under loss-share agreements, Fair value	20,208	7,111
OREO not covered under loss-share agreements:
OREO not covered under loss-share agreements, Fair value	20,538	25,252
Impairment recognized in results of operations [Member]
OREO covered under loss-share agreements:
OREO covered under loss-share agreements, Fair value	(1,081)	(305)
OREO not covered under loss-share agreements:
OREO not covered under loss-share agreements, Fair value	(1,383)	(6,892)
Increase in FDIC loss-share indemnification asset [Member]
OREO covered under loss-share agreements:
OREO covered under loss-share agreements, Fair value	$ (4,326)	$ (1,221)