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Acquired and Covered Loans - Changes in Accretable Yield (Details) - Receivables acquired with deteriorated credit quality - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Changes in Accretable Yield [Roll Forward]      
Beginning balance $ 19,386 $ 24,912 $ 28,244
Additions 27,316 3,981 1,168
Accretion (15,529) (8,063) (11,311)
Other [1] 1,784 (1,444) 6,811
Ending balance $ 32,957 $ 19,386 $ 24,912
[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.