Fair Value Measurements (Details 4) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
OREO covered under loss-share agreements:
OREO covered under loss-share agreements, Fair value	$ 25,457	$ 14,710
OREO not covered under loss-share agreements:
OREO not covered under loss-share agreements, Fair value	3,405	19,051
Carrying amount prior to remeasurement [Member]
OREO covered under loss-share agreements:
OREO covered under loss-share agreements, Fair value	30,365	19,254
OREO not covered under loss-share agreements:
OREO not covered under loss-share agreements, Fair value	4,215	22,277
Impairment recognized in results of operations [Member]
OREO covered under loss-share agreements:
OREO covered under loss-share agreements, Fair value	(982)	(901)
OREO not covered under loss-share agreements:
OREO not covered under loss-share agreements, Fair value	(810)	(3,226)
Increase in FDIC loss-share indemnification asset [Member]
OREO covered under loss-share agreements:
OREO covered under loss-share agreements, Fair value	(3,926)	(3,602)
Receivable from other guarantor [Member]
OREO covered under loss-share agreements:
OREO covered under loss-share agreements, Fair value	$ 0	$ (41)