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Business Combination - Information about ACI Loans Acquired in Merger as of Acquisition Date (Details) - State Bank Financial Corporation - ACI Loans
$ in Thousands
Jan. 01, 2019
USD ($)
Business Acquisition [Line Items]  
Contractually required principal and interest at acquisition $ 162,003
Contractual cash flows not expected to be collected (nonaccretable difference) 23,467
Expected cash flows at acquisition 138,536
Accretable difference 42,626
Basis in acquired loans at acquisition - estimated fair value $ 95,910