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Acquisition (Summary of Credit Adjustment on Acquired Impaired Loans) (Details) - MNB Corporation [Member]
$ in Thousands
May 01, 2020
USD ($)
Business Acquisition [Line Items]  
Contractual principal and interest at acquisition $ 3,778
Nonaccretable difference (2,214)
Expected cash flows at acquisition 1,564
Accretable yield (248)
Fair value of purchased impaired loans $ 1,316