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Loans Receivable and Allowance for Loan Losses (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment | $ 0 |  |
Loans acquired with credit deterioration | 15,410,000 |  |
Real Estate Acquired Through Foreclosure | 965,000 | $ 1,556,000 |
Impaired Financing Receivable, Related Allowance |  | 417,000 |
Annual Loan Review threshold, amount | 1,500,000 |  |
Loans and Leases Receivable, Gross | 1,412,289,000 | 924,676,000 |
Allowance for Loan and Lease Losses, Adjustments, Other | 2,300,000 | 417,000 |
Allowance for Loan and Lease Losses, Period Increase (Decrease) | 4,641,000 | 57,000 |
Allowance for Loan and Lease Losses, Adjustment Related To Economic Conditions |  | 447,000 |
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans | 727,000 | 101,000 |
Allowance for Loan and Lease Losses, Real Estate | 13,150,000 | $ 8,509,000 | $ 8,452,000
Historical loss factor |  | 0.15% | 0.26%
Servicing Asset at Amortized Cost | 72,500,000 | $ 28,500,000 |
Outstanding Balance | 15,570,000 | 793,000 |
Mortgage loans originated for sale | 12,312,000 | 4,715,000 |
Commercial Rentals [Member] | Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | $ 125,300,000 |  |
Concentration Risk, Percentage | 86.40% |  |
Hospitality Lodging Industry [Member] | Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | $ 117,800,000 |  |
Concentration Risk, Percentage | 81.20% |  |
Residential Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number Of Properties Under Foreclosure Proceedings | loan | 4 |  |
Mortgage Loans in Process of Foreclosure, Amount | $ 454,000 |  |
Loans and Leases Receivable, Gross | 263,127,000 | 229,781,000 |
Proceeds from Sale of Mortgage Loans Held-for-sale | 12,839,000 | 4,838,000 |
Gross Realized Gains on Loans | 527,000 | 169,000 |
Gross Realized Losses on Loans | 0 | 0 |
Commercial Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance |  | 417,000 |
Loans and Leases Receivable, Gross | 579,104,000 | 391,327,000 |
Troubled Debt Restructured Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | 75,000 | 99,000 | $ 977,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 20,000 | $ 977,000 |
PPP Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | 95,043,000 |  |
Fee income | 2,500,000 |  |
UpState New York Bancorp, Inc. [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Assets, Fair Value Adjustment | 6,937,000 |  |
Outstanding Balance | 15,410,000 |  |
COVID [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for Loan and Lease Losses, Period Increase (Decrease) | $ 2,200,000 |  |

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- Definition Amount of other addition (reduction) in allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 + Details
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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=121585399&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=121585399&loc=d3e13503-111538 + Details
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- Definition For loans and debt securities, 1) for which at acquisition it was probable that the investor would be unable to collect all contractually required payments receivable, and 2) for which it is further probable that the investor will not be able to collect all cash flows expected at acquisition (plus any additional cash flows expected due to changes in estimate after acquisition), the allowance for credit losses recorded to reflect the impairment since acquisition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5275-111524 + Details
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