Acquired and Covered Loans (Details) - Changes in Accretable Yield - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Changes in Accretable Yield [Roll Forward]
Beginning balances		$ 27,258	$ 26,420	$ 24,912	$ 28,244
Additions		0	0	3,981	0
Accretion		(2,303)	(4,335)	(3,849)	(6,998)
Other	[1]	127	(1,427)	38	(588)
Ending balance		$ 25,082	$ 20,658	$ 25,082	$ 20,658

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