Acquired and Covered Loans (Details) - Changes in FDIC Indemnification Asset - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
FDIC Indemnification Asset [Roll Forward]
Beginning balance	$ 8,540	$ 15,537	$ 8,452	$ 16,585
Amortization	(395)	(818)	(853)	(2,134)
Change in expected reimbursements from the FDIC for changes in expected credit losses	786	(629)	1,720	532
Payments received from the FDIC	(1,596)	(3,814)	(1,984)	(4,707)
Ending balance	$ 7,335	$ 10,276	$ 7,335	$ 10,276