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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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