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Portfolio Loans - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) loan | Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) loan | Dec. 31, 2020 USD ($)
Distributions of portfolio loans |  |  |  |  |
Net deferred loan origination (fees) costs | $ 4,900 |  | $ 4,900 |  | $ 2,400
Net accretable purchase accounting adjustments |  |  | 10,100 |  | 10,900
Acquired two non-accrual loans from GSB | 4,400 |  | 4,400 |  |
Gross interest income that would have been recorded if impaired loans had been current | 300 | $ 500 | 1,200 | $ 1,400 |
Amount of interest collected and recognized on a cash basis | $ 400 |  | $ 400 |  |
TDRs subsequently classified as non-performing and had payment defaults | loan | 0 | 0 | 0 | 0 |
Loans in the process of foreclosure | $ 200 |  | $ 200 |  |
Retail Real Estate |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |
Loans purchased | 0 | $ 0 | 32,200 | $ 43,900 |
Retail Real Estate | Non-performing TDRs |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |
Loans classified as a TDR |  |  | $ 100 |  |
TDRs subsequently classified as non-performing and had payment defaults | loan |  |  | 1 |  |
Maximum | Commercial Real Estate Loans |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |
Limit where loans are processed through an expedited underwriting process |  |  | $ 1,000 |  |
Watch | Commercial Loans |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |
Limit above which loans are annually reviewed |  |  | 1,000 |  |
Special Mention | Commercial Loans |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |
Limit above which loans are annually reviewed |  |  | 350 |  |
PPP Loans |  |  |  |  |
Distributions of portfolio loans |  |  |  |  |
Amortized cost of the loans outstanding | $ 178,231 |  | $ 178,231 |  | $ 446,400

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- Definition Amount of increase (decrease) of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121585399&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 + Details
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