Fair Value Measurements - (Details 4) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
OREO covered under loss-share agreements:
OREO covered under loss-share agreements	$ 1,190	$ 1,813
OREO not covered under loss-share agreements:
OREO not covered under loss-share agreements	10,627	2,647
Carrying amount prior to remeasurement
OREO covered under loss-share agreements:
OREO covered under loss-share agreements	1,380	3,162
OREO not covered under loss-share agreements:
OREO not covered under loss-share agreements	12,284	3,513
Impairment recognized in results of operations
OREO covered under loss-share agreements:
OREO covered under loss-share agreements	(38)	(185)
OREO not covered under loss-share agreements:
OREO not covered under loss-share agreements	(1,657)	(866)
Increase in FDIC loss-share indemnification asset
OREO covered under loss-share agreements:
OREO covered under loss-share agreements	(152)	(742)
Receivable from other guarantor
OREO covered under loss-share agreements:
OREO covered under loss-share agreements	$ 0	$ (422)