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Loans - Accretable Yield on Acquired Impaired Loans (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Changes in the accretable discount on acquired loans [Abstract]    
Beginning balance $ 4,633 $ 4,890
Additions from merger with HomeTown 4,410 0
Accretion (2,436) (2,362)
Reclassification from nonaccretable difference 389 956
Other changes, net 506 1,149
Ending balance $ 7,502 $ 4,633