Allowance for Credit Losses and Credit Quality of Loans (Policies)	12 Months Ended
	Dec. 31, 2022
Allowance for Credit Losses and Credit Quality of Loans [Abstract]
Allowance for Credit Losses	The January 1, 2020 (“Day 1”) increase in the allowance for credit loss on loans relating to the adoption of ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments was $3.0 million, which decreased retained earnings by $2.3 million and increased the deferred tax asset by $0.7 million. The allowance for credit losses calculation incorporated a 6-quarter forecast period to account for forecast economic conditions under each scenario utilized in the measurement. For periods beyond the 6-quarter forecast, the model reverts to long-term economic conditions over a 4-quarter reversion period on a straight-line basis. The Company considers a baseline, upside and downside economic forecast in measuring the allowance. The quantitative model as of December 31, 2022 incorporates a baseline economic outlook along with an alternative downside scenario sourced from a reputable third-party to accommodate other potential economic conditions in the model. The baseline outlook reflected an unemployment rate environment initially around pre-COVID-19 levels at 3.9% that increases slightly during the forecast period to 4.0%. Northeast GDP’s annualized growth (on a quarterly basis) is expected to start the first quarter of 2023 at approximately 3.9% and hovering around 4.6% by the end of the forecast period. Other utilized economic variables have generally deteriorated in their respective forecasts, with retail sales and housing starts forecasts declining from the prior year. Key assumptions in the baseline economic outlook included a full employment economy being realized in the near future, continued tapering of the Federal Reserve balance sheet, an increasing yield on ten-year treasury securities, and a gradual decline in global oil prices. The alternative downside scenario assumed deteriorated economic and pandemic related conditions from the baseline outlook. Under this scenario, northeast unemployment rises from 3.9% in the fourth quarter of 2022 to a peak of 6.9% in the first quarter of 2024. These scenarios and their respective weightings are evaluated at each measurement date and reflect management’s expectations as of December 31, 2022. Additional adjustments were made for factors not incorporated in the forecasts or the model, such as loss rate expectations for certain loan pools, considerations for inflation, and recent trends in asset value indices. Additional monitoring for industry concentrations, loan growth, and policy exceptions was also conducted. All these factors were considered through separate quantitative processes and incorporated when applicable into the estimate of current expected credit losses at December 31, 2022. The quantitative model as of December 31, 2021 incorporates a baseline economic outlook along with alternative upside and downside scenarios sourced from a reputable third-party to accommodate other potential economic conditions in the model. The baseline outlook reflected an unemployment rate environment initially above pre-COVID-19 levels at 4.8% but falling below pre-COVID-19 levels by the end of the forecast period to 3.5%. Northeast GDP’s annualized growth (on a quarterly basis) was expected to start the first quarter of 2022 at approximately 9% and hover around 5% by the middle and end of the forecast period. The alternative downside scenario assumed deteriorated economic and pandemic related conditions from the baseline outlook. Under this scenario, northeast unemployment rose from 5.7% in the fourth quarter of 2021 to a peak of 8% in the first quarter of 2023, remaining around or above 7% for the entire forecast period. The alternative upside scenario incorporated a more optimistic outlook than the baseline scenario, with a swift return to full employment by the second quarter of 2022 and with northeast unemployment moving down to 3.1% by the end of the forecast period. These scenarios and their respective weightings are evaluated at each measurement date and reflect management’s expectations as of December 31, 2021. At December 31, 2021, the weightings were 60%, 10% and 30% for the baseline, upside and downside economic forecasts, respectively. Additional adjustments were made for COVID-19 related factors not incorporated in the forecasts, such as the mitigating impact of unprecedented stimulus in the second and third quarters of 2020, including direct payments to individuals, increased unemployment benefits, the Company’s loan deferral and modification initiatives and various government sponsored loan programs. The Company also continued to monitor the level of criticized and classified loans in the fourth quarter of 2021 compared to the level contemplated by the model during similar, historical economic conditions, and an adjustment was made to estimate potential additional losses above modeled losses. Additionally, qualitative adjustments were made for Moody’s baseline economic forecast to include impacts of the Build Back Better Act not passing by December 31, 2021 and to address potential economic deterioration due to Omicron, as well as isolated model limitations related to modeled outputs given abnormally high retail sales and business output growth rates in historical periods. These factors were considered through separate quantitative processes and incorporated into the estimate of current expected credit losses at December 31, 2021. The quantitative model as of December 31, 2020 incorporated a baseline economic outlook, along with alternative upside and downside scenarios sourced from a reputable third-party to accommodate other potential economic conditions in the model. The baseline outlook reflected an unemployment rate environment above pre-COVID-19 levels for the entire forecast period, though steadily improving, before returning to low single digits by the end of 2023. Northeast GDP’s annual growth (on a quarterly basis) was expected to start 2021 in the low to mid-single digits, with a peak growth rate of 8% in the fourth quarter of 2021 and steadily falling back down to normalized levels through 2023 and 2024. Other utilized economic variables show improvement in their respective forecasts, namely business output. Key assumptions in the baseline economic outlook included an additional stimulus package passed at the same timing and a comparable level to that of the actual $900 billion COVID-19 relief package passed in December 2020 along with no significant secondary surge in COVID-19 cases or pandemic-related business closures. The alternative downside scenario assumed deteriorated economic and pandemic related conditions from the baseline outlook. In the same way, the alternative upside scenario assumed a faster economic recovery and more effective management of the COVID-19 virus from the baseline outlook. These scenarios and their respective weightings are evaluated at each measurement date and reflect management’s expectations as of December 31, 2020. Additional adjustments were made for COVID-19 related factors not incorporated in the forecasts, such as the mitigating impact of unprecedented stimulus in 2020, including direct payments to individuals, increased unemployment benefits, the Company’s loan deferral and modification initiatives and various government-sponsored loan programs. The commercial & industrial and consumer segment models were based upon percent change in unemployment with modeled values as of December 31, 2020 well outside the observed historical experience. Therefore, adjustments were required to produce outputs more aligned with default expectations given the forecast economic environment. Additionally, the Company identified a slightly higher level of criticized and classified loans during 2020 than those contemplated by the model during similar economic conditions in the past for which an adjustment was made for estimated expected additional losses above modeled output. These factors were considered through a separate quantitative process and incorporated into the estimate for allowance for credit losses at December 31, 2020. There were no loans purchased with credit deterioration during the years ended December 31, 2022 and 2021. During 2022, the Company purchased $11.5 million of residential loans at a 1.53% premium and $50.1 million in consumer loans at par. The allowance for credit losses recorded for these loans on the purchase date was $3.2 million. During 2021, the Company purchased $58.9 million of residential loans at premiums ranging from 2% to 5% and $92.5 million of consumer loans at a par. The allowance for credit losses recorded for these loans on the purchase date was $6.8 million. The Company made a policy election to report AIR in the other assets line item on the balance sheet. AIR on loans totaled $25.0 million at December 31, 2022 and $19.5 million at December 31, 2021 and there was no estimated allowance for credit losses related to AIR at December 31, 2022 and 2021.
Troubled Debt Restructuring	Troubled Debt Restructuring When the Company modifies a loan in a troubled debt restructuring (“TDR”), such modifications generally include one or a combination of the following: an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; temporary reduction in the interest rate; or change in scheduled payment amount. Residential and Consumer TDRs occurring during 2022 and 2021 were due to reductions in the interest rate and/or extension of the term. On August 3, 2020, the Federal Financial Institutions Examination Council issued a joint statement on additional loan accommodations related to COVID-19. The joint statement clarifies that for loan modifications in which Section 4013 of the CARES Act (“Section 4013”) is being applied, subsequent modifications could also be eligible under Section 4013. Accordingly, the Company offered modifications made in response to COVID-19 to borrowers who were current and otherwise not past due in accordance with the criteria stated in Section 4013. These include short-term, 180 days or less, modifications in the form of payment deferrals, fee waivers, extensions of repayment terms, or other delays in payment. The Company evaluated the modification programs provided to its borrowers and has concluded the modifications were generally made in accordance with the CARES Act guidance to borrowers who were in good standing prior to the COVID-19 pandemic and are not required to be designated as TDRs.

Describes an entity's accounting policy and methodology for estimating its allowance for loan and lease losses, and its accounting policy for nonperforming loans. The description identifies the factors that influenced management of the entity in establishing the level of the allowance (for example, historical losses and existing economic conditions) and also may include discussion of the risk elements relevant to particular categories of receivables. The disclosure also may describe any liability the entity has recorded for off-balance sheet credit losses and may include the basis for determining each element of the allowance for loan and lease losses. The disclosure also could discuss the entity's policy for (1) placing loans on nonaccrual status (or discontinuing accrual of interest) and recording payments received on nonaccrual loans, and the policy for resuming accrual of interest, (2) charging-off uncollectible loans, and (3) determining past due or delinquency status (that is, whether past due status is based on how recently payments have been received or contractual terms).