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Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2020
Accounting Policies [Abstract]  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles
The following table illustrates the impact on the allowance for credit losses from the adoption of ASU 2016-13:
(Dollars in thousands)As Reported Under ASC 326 January 1, 2020Pre-ASC 326 Adoption December 31, 2019Impact of ASC 326 Adoption
Assets:



Loans, at amortized cost$2,876,147 $2,873,525 $2,622 
Allowance for credit losses on loans:
  Construction651 1,188 (537)
  Commercial real estate, other8,549 6,560 1,989 
  Commercial and industrial5,820 8,568 (2,748)
  Residential real estate4,360 1,296 3,064 
  Home equity lines of credit1,572 612 960 
  Consumer, indirect5,389 2,942 2,447 
  Consumer, direct890 296 594 
  Deposit account overdrafts94 94 — 
Allowance for credit losses on loans27,325 21,556 5,769 
Liabilities:



Allowance for credit losses for unfunded commitments$1,495 $— $1,495