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Acquired Credit Impaired Loans (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Schedule of Outstanding Principal Balance and Carrying Amounts for Acquired Credit-Impaired Loans
The following is the outstanding principal balance and carrying amounts for all acquired credit impaired loans for which the company applies ASC 310-30 as of December 31, 2018 and 2017:
 
(Dollars in thousands)
December 31, 2018
 
December 31, 2017
Outstanding principal balance
$
18,642

 
$
27,034

Carrying amount
14,718

 
21,295

Allowance for loan losses
227

 
358
Summary of Changes in Accretable Yield on Acquired Credit Impaired Loans
The following table presents the changes in accretable yield on all acquired credit impaired loans for the years indicated:
 
(Dollars in thousands)
Accretable Yield
Balance at December 31, 2016
$
5,150

Accretion
(2,636
)
Reclassification from nonaccretable difference
2,015

Additions/adjustments
(1,149
)
Disposals
(345
)
Balance at December 31, 2017
$
3,035

Accretion
(1,704
)
Reclassification from nonaccretable difference
1,527

Additions/adjustments
(395
)
Disposals
—

Balance at December 31, 2018
$
2,463