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Loans - Collateral Dependent Loans (Details) - USD ($) | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020
Loans |  |  |  |
Loans individually evaluated for impairment |  |  | $ 1,000,000.0 | $ 500,000
Increase in overall collateral dependent loans | $ 11,600,000 |  |  |
Number of months generally required to return to accruing status | 6 months |  |  |
Commercial non-owner occupied |  |  |  |
Loans |  |  |  |
Collateral dependent loans | $ 18,539,000 | $ 6,935,000 |  |
Collateral Coverage | 24,570,000 | 8,050,000 |  |
Commercial non-owner occupied | Hotel |  |  |  |
Loans |  |  |  |
Collateral dependent loans | 2,296,000 |  |  |
Collateral Coverage | $ 3,690,000 |  |  |
Collateral Coverage (as a percent) | 161.00% |  |  |
Commercial non-owner occupied | Other |  |  |  |
Loans |  |  |  |
Collateral dependent loans | $ 7,037,000 |  |  |
Collateral Coverage | $ 9,630,000 |  |  |
Collateral Coverage (as a percent) | 137.00% |  |  |
Commercial owner occupied real estate loan | Office |  |  |  |
Loans |  |  |  |
Collateral dependent loans |  | 1,076,000 |  |
Collateral Coverage |  | $ 1,485,000 |  |
Collateral Coverage (as a percent) |  | 138.00% |  |
Commercial owner occupied real estate loan | Other |  |  |  |
Loans |  |  |  |
Collateral dependent loans | $ 4,716,000 | $ 1,010,000 |  |
Collateral Coverage | $ 5,490,000 | $ 1,075,000 |  |
Collateral Coverage (as a percent) | 116.00% | 106.00% |  |
Commercial owner occupied real estate loan | Retail |  |  |  |
Loans |  |  |  |
Collateral dependent loans | $ 4,490,000 | $ 4,849,000 |  |
Collateral Coverage | $ 5,760,000 | $ 5,490,000 |  |
Collateral Coverage (as a percent) | 128.00% | 113.00% |  |

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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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