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Loans Receivable and Allowance for Loan Losses (Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($) | Dec. 31, 2020 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 |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | 0 |  |
Financing Receivable, Troubled Debt Restructuring | 0 |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 0 |  |
Loans acquired with credit deterioration | 15,410,000 |  |
Real Estate Acquired Through Foreclosure | $ 346,000 | $ 1,742,000 |
Number Of Properties Under Foreclosure Proceedings | loan | 4 |  |
Annual Loan Review threshold, amount | $ 1,500,000 |  |
Loans and Leases Receivable, Gross | 1,474,424,000 | 1,356,040,000 |
Proceeds from Sale of Mortgage Loans Held-for-sale | 845,000 | 8,616,000 |
Allowance for Loan and Lease Losses, Adjustments, Other | 2,400,000 | 1,500,000 |
Allowance for Loan and Lease Losses, Period Increase (Decrease) | 557,000 | 3,292,000 |
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans | 182,000 | 35,000 |
Allowance for Loan and Lease Losses, Real Estate | 16,999,000 | 16,442,000 | $ 13,150,000
Servicing Asset at Amortized Cost | 60,000,000.0 | 65,400,000 |
Outstanding Balance | 8,368,000 | 12,862,000 |
Hospitality Lodging Industry [Member] | Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | 0 | 0 |
Residential Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage Loans in Process of Foreclosure, Amount | 223,000 |  |
Loans and Leases Receivable, Gross | 298,813,000 | 273,040,000 |
Proceeds from Sale of Mortgage Loans Held-for-sale | 848,000 | 8,793,000 |
Gross Realized Gains on Loans | 3,000 | 177,000 |
Gross Realized Losses on Loans | 0 | 0 |
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 | $ 113,000,000.0 |  |
Concentration Risk, Percentage | 7.70% |  |
Commercial Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number Of Properties Under Foreclosure Proceedings | loan | 1 |  |
Loans and Leases Receivable, Gross | $ 651,544,000 | 628,724,000 |
Commercial Real Estate Loans [Member] | Commercial Rentals [Member] | Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | $ 141,900,000 |  |
Concentration Risk, Percentage | 9.60% |  |
PPP Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | $ 121,000 | 15,209,000 |
Fee income | 0 | 2,900,000 |
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) | 445,000 | $ 1,400,000 |
Economic Conditions [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for Loan and Lease Losses, Period Increase (Decrease) | $ 2,300,000 |  |

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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 https://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 https://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 https://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 https://asc.fasb.org/extlink&oid=123409700&loc=d3e13503-111538 + Details
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