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Loans Receivable and Allowance for Loan Losses (Narrative) (Details) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) property loan item | Dec. 31, 2020 USD ($) | Jul. 07, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans acquired with credit deterioration | $ 15,410,000 |  |
Real Estate Acquired Through Foreclosure | 1,876,000 | $ 965,000 |
Impaired Financing Receivable, Related Allowance | 275,000 |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down |  | 20,000 |
Loans and Leases Receivable, Gross | 1,372,774,000 | 1,412,289,000 |
Outstanding Balance | $ 13,332,000 | 15,570,000 |
Single Property [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number Of Properties Under Foreclosure Proceedings | item | 1 |  |
Mortgage Loans in Process of Foreclosure, Amount | $ 1,032,000 |  |
Multiple Properties [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Real Estate Acquired Through Foreclosure | $ 121,000 |  |
Number Of Properties Disposed By Sale | property | 1 |  |
Residential Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number Of Properties Under Foreclosure Proceedings | property | 4 |  |
Mortgage Loans in Process of Foreclosure, Amount | $ 492,000 |  |
Loans and Leases Receivable, Gross | 265,778,000 | 263,127,000 |
Residential Real Estate Loans [Member] | Hospitality Lodging Industry [Member] | Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | $ 116,500,000 |  |
Concentration Risk, Percentage | 8.50% |  |
Commercial Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance | $ 275,000 |  |
Loans and Leases Receivable, Gross | 612,794,000 | 579,104,000 |
Commercial Real Estate Loans [Member] | Commercial Rentals [Member] | Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | $ 133,700,000 |  |
Concentration Risk, Percentage | 9.70% |  |
Troubled Debt Restructured Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring | $ 0 | 75,000 |
Impaired Financing Receivable, Related Allowance | $ 0 | 0 |
New Loans Identified as Troubled Debt Restructurings, Number of Loans | loan | 0 |  |
PPP Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Outstanding Balance | $ 35,800,000 | $ 95,000,000.0 |
Loan forgiven | 116,400,000 |  |
Fee income | 5,200,000 |  |
UpState New York Bancorp, Inc. [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Assets, Fair Value Adjustment | 6,937,000 |  |
Loans acquired with credit deterioration |  |  | $ 15,410,000
Outstanding Balance | 15,410,000 |  |
Minimum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Annual Loan Review threshold, amount | 1,500,000 |  |
COVID [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for Loan and Lease Losses, Period Increase (Decrease) | $ 2,100,000 |  |

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- Definition The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 2: 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=123409700&loc=d3e13503-111538 + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 2: 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=123409700&loc=d3e13503-111538 + Details
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