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Business Combinations - Acquired Impaired Loans (Details) - RBPI
$ in Thousands
Dec. 15, 2017
USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]  
Contractually required principal and interest payments $ 40,741
Contractual cash flows not expected to be collected (nonaccretable difference) (17,637)
Cash flows expected to be collected 23,104
Interest component of expected cash flows (accretable yield) (2,644)
Fair value of loans acquired with deterioration of credit quality $ 20,460