Acquired and Covered Loans (Details) - Changes in Accretable Yield - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Changes in Accretable Yield [Roll Forward]
Beginning balances		$ 26,420	$ 32,010	$ 28,244	$ 36,792
Accretion		(4,335)	(3,421)	(6,998)	(6,931)
Other	[1]	(1,427)	6,563	(588)	5,291
Ending balance		$ 20,658	$ 35,152	$ 20,658	$ 35,152

[1] Decreases result from the resolution of certain loans occurring earlier than anticipated while increases represent a rise in the expected future cash flows to be collected over the remaining estimated life of the underlying portfolio.