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Acquisition (Summary of Fair Value Adjustments of Loans Acquired) (Details) - MNB Corporation [Member] - USD ($)
$ in Thousands
May 01, 2020
Apr. 30, 2020
Business Acquisition [Line Items]    
Gross amortized cost basis at April 30, 2020   $ 250,347
Interest rate fair value adjustment on pools of homogeneous loans   3,335
Credit fair value adjustment on pools of homogeneous loans   (6,863)
Credit fair value adjustment on purchased credit impaired loans   (1,536)
Fair value of acquired loans at April 30, 2020 $ 245,300 $ 245,283