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Acquired and Covered Loans - Changes in Accretable Yield (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Changes in Accretable Yield [Roll Forward]        
Beginning balances $ 39,535 $ 36,543 $ 43,725 $ 32,957
Additions 16,037 0 16,037 0
Accretion (3,670) (2,922) (7,871) (6,540)
Other [1] (1,017) 5,387 (1,006) 12,591
Ending balance $ 50,885 $ 39,008 $ 50,885 $ 39,008
[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.