Acquired and Covered Loans (Details) - Changes in Accretable Yield - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Changes in Accretable Yield [Roll Forward]
Beginning balances		$ 25,082	$ 20,658	$ 24,912	$ 28,244
Additions		0	0	3,981	0
Accretion		(2,763)	(2,366)	(6,612)	(9,364)
Other	[1]	(1,012)	336	(974)	(252)
Ending balance		$ 21,307	$ 18,628	$ 21,307	$ 18,628

[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.