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Loans and Allowance for Loan Losses - Summary of Impaired Loans (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	$ 5,804	$ 3,525
Unpaid Principal Balance, With no related allowance recorded	6,867	4,622
Average Recorded Investment, With no related allowance recorded	5,818	3,583
Interest Income Recognized, With no related allowance recorded	60	52
Recorded Investment, With an allowance recorded	1,905	3,749
Unpaid Principal Balance, With an allowance recorded	2,835	3,752
Allocated Related Allowance, With an allowance recorded	53	51
Average Recorded Investment, With an allowance recorded	1,913	3,842
Interest Income Recognized, With an allowance recorded	66	170
Total impaired loans, Recorded Investment	7,709	7,274
Total impaired loans, Unpaid Principal Balance	9,702	8,374
Total impaired loans, Allocated Related Allowance	53	51
Total impaired loans, Average Recorded Investment	7,731	7,425
Total impaired loans, Interest Income Recognized	126	222
Commercial (Secured by Real Estate)
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	3,553	1,136
Unpaid Principal Balance, With no related allowance recorded	3,599	2,232
Average Recorded Investment, With no related allowance recorded	3,549	1,138
Interest Income Recognized, With no related allowance recorded	61	42
Recorded Investment, With an allowance recorded		1,448
Unpaid Principal Balance, With an allowance recorded		1,449
Allocated Related Allowance, With an allowance recorded		2
Interest Income Recognized, With an allowance recorded		91
Commercial and Industrial
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	315	395
Unpaid Principal Balance, With no related allowance recorded	315	395
Average Recorded Investment, With no related allowance recorded	315	395
Interest Income Recognized, With no related allowance recorded	0
Recorded Investment, With an allowance recorded	618	690
Unpaid Principal Balance, With an allowance recorded	618	690
Allocated Related Allowance, With an allowance recorded	45	35
Average Recorded Investment, With an allowance recorded	618	1,481
Interest Income Recognized, With an allowance recorded		6
Construction, Land and Acquisition & Development
Financing Receivable Impaired [Line Items]
Average Recorded Investment, With an allowance recorded		727
Residential Mortgage
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	1,934	1,986
Unpaid Principal Balance, With no related allowance recorded	2,951	1,987
Average Recorded Investment, With no related allowance recorded	1,952	2,041
Interest Income Recognized, With no related allowance recorded	0	9
Recorded Investment, With an allowance recorded	1,287	1,611
Unpaid Principal Balance, With an allowance recorded	2,217	1,613
Allocated Related Allowance, With an allowance recorded	8	14
Average Recorded Investment, With an allowance recorded	1,295
Interest Income Recognized, With an allowance recorded	66	73
Consumer Installment
Financing Receivable Impaired [Line Items]
Recorded Investment, With no related allowance recorded	2	8
Unpaid Principal Balance, With no related allowance recorded	2	8
Average Recorded Investment, With no related allowance recorded	$ 2	9
Interest Income Recognized, With no related allowance recorded		1
Average Recorded Investment, With an allowance recorded		$ 1,634

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