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Basis of Presentation - Summary of Impact of CECL (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Assets            
Allowance for credit losses $ 12,890 $ 11,592 $ 15,637 $ 15,211 $ 14,393 $ 14,176
Liabilities            
ACL - off balance sheet credit exposure 1,240   143      
Total ACL 14,130   15,780      
Adoption Impact            
Assets            
Allowance for credit losses     (3,789)      
Liabilities            
ACL - off balance sheet credit exposure     1,703      
Total ACL     (2,086)      
As Reported            
Liabilities            
ACL - off balance sheet credit exposure     1,846      
Total ACL     13,694      
Commercial, financial, and agricultural            
Assets            
Allowance for credit losses 3,913 3,019 1,914 2,069 2,108 1,946
Commercial, financial, and agricultural | Adoption Impact            
Assets            
Allowance for credit losses     2,656      
Commercial, financial, and agricultural | As Reported            
Assets            
Allowance for credit losses     4,570      
Consumer automobile loans            
Assets            
Allowance for credit losses 2,584 2,446 1,617 1,585 1,307 1,411
Consumer automobile loans | Adoption Impact            
Assets            
Allowance for credit losses     240      
Consumer automobile loans | As Reported            
Assets            
Allowance for credit losses     1,857      
Other consumer installment loans            
Assets            
Allowance for credit losses 704 680 109 118 110 111
Other consumer installment loans | Adoption Impact            
Assets            
Allowance for credit losses     602      
Other consumer installment loans | As Reported            
Assets            
Allowance for credit losses     711      
Unallocated            
Assets            
Allowance for credit losses 0 0 638 498 456 492
Unallocated | Adoption Impact            
Assets            
Allowance for credit losses     (638)      
Unallocated | As Reported            
Assets            
Allowance for credit losses     0      
Residential | Real Estate Mortgages            
Assets            
Allowance for credit losses 1,168 1,078 5,061 5,195 4,818 4,701
Residential | Real Estate Mortgages | Adoption Impact            
Assets            
Allowance for credit losses     (3,893)      
Residential | Real Estate Mortgages | As Reported            
Assets            
Allowance for credit losses     1,168      
Commercial | Real Estate Mortgages            
Assets            
Allowance for credit losses 4,323 4,191 6,110 5,536 5,395 5,336
Commercial | Real Estate Mortgages | Adoption Impact            
Assets            
Allowance for credit losses     (2,660)      
Commercial | Real Estate Mortgages | As Reported            
Assets            
Allowance for credit losses     3,450      
Construction | Real Estate Mortgages            
Assets            
Allowance for credit losses $ 198 $ 178 188 $ 210 $ 199 $ 179
Construction | Real Estate Mortgages | Adoption Impact            
Assets            
Allowance for credit losses     (96)      
Construction | Real Estate Mortgages | As Reported            
Assets            
Allowance for credit losses     $ 92