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Mergers and acquisitions Mergers and acquisitions - Loans and Debt Securities Acquired with Deteriorated Credit Quality (Details) - Atlantic Capital Bank
$ in Thousands
Apr. 05, 2019
USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]  
Contractually-required principal and interest $ 11,374
Nonaccretable difference 1,615
Best estimate of contractual cash flows expected to be collected 9,759
Accretable yield 1,167
Fair value $ 8,592