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Purchased Loans - Changes in Accretable Yield of Loans Purchased with Deteriorated Credit Quality (Details) - Purchased loans
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Changes in accretable yield of loans acquired with deteriorated credit quality  
Balance at January 1, 2019 $ (34,265)
Measurement period adjustment on recently acquired loans (3,712)
Reclassification from nonaccretable difference (6,056)
Accretion 16,442
Charge-offs 1,537
Balance at September 30, 2019 $ (26,054)