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Purchased Credit Impaired Loans - Accretable Yield or Income Expected to be Collected (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]      
Accretable yield beginning balance $ 2,132 $ 2,143  
Additions 0 0  
Accretion (385) (580)  
Reclassification from nonaccretable 186 501  
Disposals (7) 0  
Accretable yield ending balance 1,926 $ 2,064  
Loans acquired with deteriorated credit quality      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans acquired and accounted for under ASC 310-30, carrying amount 13,300   $ 16,100
Loans acquired and accounted for under ASC 310-30, allowance amount $ 124   $ 124