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Purchased Credit Impaired Loans - Accretable Yield or Income Expected to be Collected (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]          
Accretable yield beginning balance $ 1,914 $ 2,423 $ 2,143 $ 2,890  
Additions 576 0 576 0  
Accretion (420) (1,004) (1,638) (2,441)  
Reclassification from nonaccretable 374 798 1,363 1,768  
Disposals (165) (16) (165) (16)  
Accretable yield ending balance 2,279 $ 2,201 2,279 $ 2,201  
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 18,500   18,500   $ 17,300
Loans acquired and accounted for under ASC 310-30, allowance amount $ 453   $ 453