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Loans and Allowance for Loan and Lease Losses - Schedule of Changes in Accretable Yield for the PCI Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]      
Accretable yield, beginning balance $ 2,793 $ 4,261 $ 2,594
Additions 2,997 371 4,124
Accretion (1,430) (3,442) (3,092)
Reclassification from nonaccretable to accretable yield 1,351 2,108 646
Disposals   (505) (11)
Accretable yield, ending balance $ 5,711 $ 2,793 $ 4,261