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Loans and Allowance for Credit Losses - Purchased credit-impaired loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased credit impaired loans $ 3,734 $ 5,909
Contractually required payments receivable on PCI loans at acquisition: 4,305 6,482
Cash flows expected to be collected at acquisition $ 1,504 $ 1,392