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Acquired and Covered Loans - Changes in Accretable Yield (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Changes in Accretable Yield [Roll Forward]        
Beginning balances $ 36,543 $ 41,249 $ 32,957 $ 19,385
Additions 0 0 0 27,316
Accretion (2,922) (3,888) (6,540) (7,843)
Other [1] 5,387 2,509 12,591 1,012
Ending balance $ 39,008 $ 39,870 $ 39,008 $ 39,870
[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.