Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2020
Accounting Policies [Abstract]
New Adopted Accounting Standards and Accounting Standards Pending Adoption	Impact of Adoption of ASU 2016-13 Securities For available-for-sale debt securities in an unrealized loss position, the Company evaluates the securities to determine whether the decline in the fair value below the amortized cost basis (impairment) is due to credit-related factors or noncredit-related factors. Any impairment that is not credit-related is recognized in other comprehensive income, net of applicable taxes. Credit-related impairment is recognized as an allowance for credit losses (“ACL”) on the Statement of Condition, limited to the amount by which the amortized cost basis exceeds the fair value, with a corresponding adjustment to earnings. Both the ACL and the adjustment to net income may be reversed if conditions change. However, if the Company intends to sell an impaired available- for-sale debt security or more likely than not will be required to sell such a security before recovering its amortized cost basis, the entire impairment amount must be recognized in earnings with a corresponding adjustment to the security’s amortized cost basis. Because the security’s amortized cost basis is adjusted to fair value, there is no ACL in this situation. Changes in the allowance for credit losses are recorded as provision (credit) for credit loss expense. Losses are charged against the ACL when management believes the uncollectability of an available-for-sale debt security is confirmed or when either of the criteria regarding intent or requirement to sell is met. Accrued interest receivable on securities is excluded from the estimate of credit losses. Acquired Loans Acquired loans are recorded at fair value at the date of acquisition based on a discounted cash flow methodology that considers various factors including the type of loan and related collateral, classification status, fixed or variable interest rate, term of loan and whether or not the loan was amortizing, and a discount rate reflecting the Company’s assessment of risk inherent in the cash flow estimates. Certain larger purchased loans are individually evaluated while certain purchased loans are grouped together according to similar risk characteristics and are treated in the aggregate when applying various valuation techniques. These cash flow evaluations are inherently subjective as they require material estimates, all of which may be susceptible to significant change. Prior to January 1, 2020, loans acquired in a business combination that had evidence of deterioration of credit quality since origination and for which it was probable, at acquisition, that the Company would be unable to collect all contractually required payments receivable were considered purchased credit impaired (“PCI”) loans. PCI loans were individually evaluated and recorded at fair value at the date of acquisition with no initial valuation allowance based on a discounted cash flow methodology that considered various factors including the type of loan and related collateral, classification status, fixed or variable interest rate, term of loan and whether or not the loan was amortizing, and a discount rate reflecting the Company’ assessment of risk inherent in the cash flow estimates. The difference between the undiscounted cash flows expected at acquisition and the investment in the loan, or the “accretable yield,” was recognized as interest income on a level-yield method over the life of the loan. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acquisition, or the “non-accretable difference,” were not recognized on the Statement of Condition and did not result in any yield adjustments, loss accruals or valuation allowances. Increases in expected cash flows, including prepayments, subsequent to the initial investment were recognized prospectively through adjustment of the yield on the loan over its remaining life. Decreases in expected cash flows were recognized as impairment. Valuation allowances on PCI loans reflected only losses incurred after the acquisition (meaning the present value of all cash flows expected at acquisition that ultimately were not to be received). Subsequent to January 1, 2020 in connection with the Company's adoption of ASU 2016-13, loans acquired in a business combination that have experienced more-than-insignificant deterioration in credit quality since origination are considered purchased credit deteriorated (“PCD”) loans. At the acquisition date, an estimate of expected credit losses is made for groups of PCD loans with similar risk characteristics and individual PCD loans without similar risk characteristics. This initial allowance for credit losses is allocated to individual PCD loans and added to the purchase price or acquisition date fair values to establish the initial amortized cost basis of the PCD loans. As the initial allowance for credit losses is added to the purchase price, there is no credit loss expense recognized upon acquisition of a PCD loan. Any difference between the unpaid principal balance of PCD loans and the amortized cost basis is considered to relate to noncredit factors and results in a discount or premium. Discounts and premiums are recognized through interest income on a level-yield method over the life of the loans. All loans considered to be PCI prior to January 1, 2020 were converted to PCD on that date. The subsequent measurement of expected credit losses for all acquired loans is the same as the subsequent measurement of expected credit losses for originated loans. Allowance for Credit Losses – Loans Under the current expected credit loss model, the ACL on loans is a valuation allowance estimated at each balance sheet date in accordance with U.S. GAAP that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected on the loans. The Company estimates the ACL on loans based on the underlying assets’ amortized cost basis, which is the amount at which the financing receivable is originated or acquired, adjusted for applicable accretion or amortization of premium, discount, collection of cash, and charge-offs. In the event that collection of principal becomes uncertain, the Company has policies in place to reverse accrued interest in a timely manner. Therefore, the Company has made a policy election to exclude accrued interest from the measurement of ACL. Expected credit losses are reflected in the ACL through a charge to the provision for credit loss expense. When the Company deems all or a portion of a financial asset to be uncollectible, the appropriate amount is written off and the ACL is reduced by the same amount. In general, the principal balance of a loan is charged off in full or in part when management concludes, based on the available facts and circumstances, that collection of principal in full is not probable. Subsequent recoveries, if any, are credited to the ACL when received. The Company measures expected credit losses of financial assets at the loan level by segment, by pooling loans when the financial assets share similar risk characteristics. Depending on the nature of the pool of financial assets with similar risk characteristics, the Company uses a discounted cash flow (“DCF”) method to estimate the expected credit losses. Allowance on loans that do not share risk characteristics are evaluated on an individual basis. The Company assigns a credit risk rating to all commercial and commercial real estate loans. The Company reviews commercial and commercial real estate loans rated Substandard or worse, on nonaccrual and greater than $250,000 for loss potential and when deemed appropriate assigns an allowance based on an individual evaluation. The Company’s methodologies for estimating the ACL consider available relevant information about the collectability of cash flows, including information about past events, current conditions, and reasonable and supportable forecasts. The methodologies apply historical loss information, adjusted for asset-specific characteristics, economic conditions at the measurement date, and forecasts about future economic conditions expected to exist through the contractual lives of the financial assets that are reasonable and supportable, to the identified pools of financial assets with similar risk characteristics for which the historical loss experience was observed. The Company’s methodologies revert back to average historical loss information on a straight line basis over eight quarters when it can no longer develop reasonable and supportable forecasts. The Company has identified the following pools of financial assets with similar risk characteristics for measuring expected credit losses: commercial, commercial real estate, residential, home equity, consumer and leases. This segmentation was selected based on the differences in the risk profile of each of these categories and aligns well with regulatory reporting categories. This segmentation separates borrower type, collateral type and the nature of the loan. The differences in risk profiles of these segments enables the ACL to be more precise in its allocation due to the inherent risk in these specific portfolios. Discounted Cash Flow Method The Company uses the discounted cash flow method to estimate expected credit losses for the commercial, commercial real estate, residential, home equity, and consumer loan pools. For each of these loan segments, the Company generates cash flow projections at the instrument level wherein payment expectations are adjusted for estimated prepayment speed, curtailments, time to recovery, probability of default, and loss given default. The modeling of expected prepayment speeds, curtailment rates, and time to recovery are based on historical internal data. The Company uses regression analysis of historical internal and peer data to determine suitable loss drivers to utilize when modeling lifetime probability of default and loss given default. This analysis also determines how expected probability of default and loss given default will react to forecasted levels of the loss drivers. For all loan pools utilizing the DCF method, management utilizes and forecasts one or both of the following economic factors; national unemployment and gross domestic product as loss drivers. For all DCF models, management has determined that four quarters represents a reasonable and supportable forecast period and reverts back to a historical loss rate over eight quarters on a straight-line basis. Management leverages economic projections from an independent third party to inform its loss driver forecasts over the four-quarter forecast period. Other internal and external indicators of economic forecasts are also considered by management when developing the forecast metrics. The model considers a base case forecast and two alternative forecasts and assigns weightings to these three scenarios based on current conditions and expectations for future conditions. The combination of adjustments for credit expectations (default and loss) and timing expectations (prepayment, curtailment, and time to recovery) produces an expected cash flow stream at the instrument level. Instrument effective yield is calculated, net of the impacts of prepayment assumptions, and the instrument expected cash flows are then discounted at that effective yield to produce an instrument-level net present value of expected cash flows (“NPV”). An ACL is established for the difference between the instrument’s NPV and amortized cost basis. The model also considers the need to qualitatively adjust expected loss estimates for information not already captured in the loss estimation process. These qualitative factors include those suggested by the Interagency Policy Statement on Allowances for Credit Losses. These qualitative factor adjustments may increase or decrease the Company's estimate of expected credit losses. Due to the size and characteristics of the leasing portfolio, the remaining life method, using the historical loss rate of the commercial and industrial segment, is used to determine the allowance for credit losses. Individually Evaluated Financial Assets Loans that do not share common risk characteristics are evaluated on an individual basis. For collateral dependent financial assets where the Company has determined that foreclosure of the collateral is probable, or where the borrower is experiencing financial difficulty and the Company expects repayment of the financial asset to be provided substantially through the operation or sale of the collateral, the ACL is measured based on the difference between the fair value of the collateral less cost to sell, and the amortized cost basis of the asset as of the measurement date. The ACL may be zero if the fair value of the collateral at the measurement date exceeds the amortized cost basis of the financial asset. The Company’s estimate of the ACL reflects losses expected over the remaining contractual life of the assets. The contractual term does not consider extensions, renewals or modifications unless the Company has identified an expected troubled debt restructuring. Troubled Debt Restructuring A loan that has been modified or renewed is considered a troubled debt restructuring (“TDR”) when two conditions are met: 1) the borrower is experiencing financial difficulty and 2) concessions are made for the borrower's benefit that would not otherwise be considered for a borrower or transaction with similar credit risk characteristics. The Company’s ACL reflects all effects of a TDR when an individual asset is specifically identified as a reasonably expected TDR. The Company has determined that a TDR is reasonably expected no later than the point when the lender concludes that modification is the best course of action and it is at least reasonably possible that the troubled borrower will accept some form of concession from the lender to avoid a default. Reasonably expected TDRs and executed non-performing TDRs are evaluated individually to determine the required ACL. TDRs performing in accordance with their modified contractual terms for a reasonable period of time may be included in the Company’s existing pools based on the underlying risk characteristics of the loan to measure the ACL. The provisions of the Coronavirus Aid, Relief and Economic Security Act ("CARES Act") and interagency guidance issued by Federal banking regulators provided guidance and clarification related to modifications and deferral programs to assist borrowers who are negatively impacted by the COVID-19 national emergency. The guidance and clarifications detail certain provisions whereby banks are permitted to make deferrals and modifications to the terms of a loan which would not require the loan to be reported as a troubled debt restructuring ('TDR"). In accordance with the CARES Act and the interagency guidance, the Company elected to adopt the provisions to not report qualified loan modifications as troubled debt restructurings. Loan Commitments and Allowance for Credit Losses on Off-Balance Sheet Credit Exposures Financial instruments include off-balance sheet credit instruments, such as commitments to make loans, unused lines of credit and commercial letters of credit, issued to meet customer financing needs. The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for off-balance sheet loan commitments is represented by the contractual amount of those instruments. Such financial instruments are recorded when they are funded. The Company records an allowance for credit losses on off-balance sheet credit exposures, unless the commitments to extend credit are unconditionally cancellable, through a charge to the provision for credit loss expense for off-balance sheet credit exposures included in other noninterest expense in the Company’s consolidated statements of income. The ACL on off-balance sheet credit exposures is estimated by loan segment at each balance sheet date under the current expected credit loss model using similar methodologies as portfolio loans, taking into consideration the likelihood that funding will occur, and is included in other liabilities on the Company’s statements of condition.

For available-for-sale debt securities in an unrealized loss position, the Company evaluates the securities to determine whether the decline in the fair value below the amortized cost basis (impairment) is due to credit-related factors or noncredit-related factors. Any impairment that is not credit-related is recognized in other comprehensive income, net of applicable taxes. Credit-related impairment is recognized as an allowance for credit losses (“ACL”) on the Statement of Condition, limited to the amount by which the amortized cost basis exceeds the fair value, with a corresponding adjustment to earnings. Both the ACL and the adjustment to net income may be reversed if conditions change. However, if the Company intends to sell an impaired available- for-sale debt security or more likely than not will be required to sell such a security before recovering its amortized cost basis, the entire impairment amount must be recognized in earnings with a corresponding adjustment to the security’s amortized cost basis. Because the security’s amortized cost basis is adjusted to fair value, there is no ACL in this situation.

Changes in the allowance for credit losses are recorded as provision (credit) for credit loss expense. Losses are charged against the ACL when management believes the uncollectability of an available-for-sale debt security is confirmed or when either of the criteria regarding intent or requirement to sell is met.

Acquired loans are recorded at fair value at the date of acquisition based on a discounted cash flow methodology that considers various factors including the type of loan and related collateral, classification status, fixed or variable interest rate, term of loan and whether or not the loan was amortizing, and a discount rate reflecting the Company’s assessment of risk inherent in the cash flow estimates. Certain larger purchased loans are individually evaluated while certain purchased loans are grouped together according to similar risk characteristics and are treated in the aggregate when applying various valuation techniques. These cash flow evaluations are inherently subjective as they require material estimates, all of which may be susceptible to significant change.

Prior to January 1, 2020, loans acquired in a business combination that had evidence of deterioration of credit quality since origination and for which it was probable, at acquisition, that the Company would be unable to collect all contractually required payments receivable were considered purchased credit impaired (“PCI”) loans. PCI loans were individually evaluated and recorded at fair value at the date of acquisition with no initial valuation allowance based on a discounted cash flow

methodology that considered various factors including the type of loan and related collateral, classification status, fixed or variable interest rate, term of loan and whether or not the loan was amortizing, and a discount rate reflecting the Company’ assessment of risk inherent in the cash flow estimates. The difference between the undiscounted cash flows expected at acquisition and the investment in the loan, or the “accretable yield,” was recognized as interest income on a level-yield method over the life of the loan. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acquisition, or the “non-accretable difference,” were not recognized on the Statement of Condition and did not result in any yield adjustments, loss accruals or valuation allowances. Increases in expected cash flows, including prepayments, subsequent to the initial investment were recognized prospectively through adjustment of the yield on the loan over its remaining life. Decreases in expected cash flows were recognized as impairment. Valuation allowances on PCI loans reflected only losses incurred after the acquisition (meaning the present value of all cash flows expected at acquisition that ultimately were not to be received).

Subsequent to January 1, 2020 in connection with the Company's adoption of ASU 2016-13, loans acquired in a business combination that have experienced more-than-insignificant deterioration in credit quality since origination are considered purchased credit deteriorated (“PCD”) loans. At the acquisition date, an estimate of expected credit losses is made for groups of PCD loans with similar risk characteristics and individual PCD loans without similar risk characteristics. This initial allowance for credit losses is allocated to individual PCD loans and added to the purchase price or acquisition date fair values to establish the initial amortized cost basis of the PCD loans. As the initial allowance for credit losses is added to the purchase price, there is no credit loss expense recognized upon acquisition of a PCD loan. Any difference between the unpaid principal balance of PCD loans and the amortized cost basis is considered to relate to noncredit factors and results in a discount or premium. Discounts and premiums are recognized through interest income on a level-yield method over the life of the loans. All loans considered to be PCI prior to January 1, 2020 were converted to PCD on that date.

Under the current expected credit loss model, the ACL on loans is a valuation allowance estimated at each balance sheet date in accordance with U.S. GAAP that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected on the loans.

The Company estimates the ACL on loans based on the underlying assets’ amortized cost basis, which is the amount at which the financing receivable is originated or acquired, adjusted for applicable accretion or amortization of premium, discount, collection of cash, and charge-offs. In the event that collection of principal becomes uncertain, the Company has policies in place to reverse accrued interest in a timely manner. Therefore, the Company has made a policy election to exclude accrued interest from the measurement of ACL.

Expected credit losses are reflected in the ACL through a charge to the provision for credit loss expense. When the Company deems all or a portion of a financial asset to be uncollectible, the appropriate amount is written off and the ACL is reduced by the same amount. In general, the principal balance of a loan is charged off in full or in part when management concludes, based on the available facts and circumstances, that collection of principal in full is not probable. Subsequent recoveries, if any, are credited to the ACL when received.

The Company measures expected credit losses of financial assets at the loan level by segment, by pooling loans when the financial assets share similar risk characteristics. Depending on the nature of the pool of financial assets with similar risk characteristics, the Company uses a discounted cash flow (“DCF”) method to estimate the expected credit losses. Allowance on loans that do not share risk characteristics are evaluated on an individual basis. The Company assigns a credit risk rating to all commercial and commercial real estate loans. The Company reviews commercial and commercial real estate loans rated Substandard or worse, on nonaccrual and greater than $250,000 for loss potential and when deemed appropriate assigns an allowance based on an individual evaluation.

The Company’s methodologies for estimating the ACL consider available relevant information about the collectability of cash flows, including information about past events, current conditions, and reasonable and supportable forecasts. The methodologies apply historical loss information, adjusted for asset-specific characteristics, economic conditions at the measurement date, and forecasts about future economic conditions expected to exist through the contractual lives of the financial assets that are reasonable and supportable, to the identified pools of financial assets with similar risk characteristics for which the historical loss experience was observed. The Company’s methodologies revert back to average historical loss information on a straight line basis over eight quarters when it can no longer develop reasonable and supportable forecasts.

The Company has identified the following pools of financial assets with similar risk characteristics for measuring expected credit losses: commercial, commercial real estate, residential, home equity, consumer and leases. This segmentation was selected based on the differences in the risk profile of each of these categories and aligns well with regulatory reporting categories. This segmentation separates borrower type, collateral type and the nature of the loan. The differences in risk profiles of these segments enables the ACL to be more precise in its allocation due to the inherent risk in these specific portfolios.

The Company uses the discounted cash flow method to estimate expected credit losses for the commercial, commercial real estate, residential, home equity, and consumer loan pools. For each of these loan segments, the Company generates cash flow projections at the instrument level wherein payment expectations are adjusted for estimated prepayment speed, curtailments, time to recovery, probability of default, and loss given default. The modeling of expected prepayment speeds, curtailment rates, and time to recovery are based on historical internal data.

The Company uses regression analysis of historical internal and peer data to determine suitable loss drivers to utilize when modeling lifetime probability of default and loss given default. This analysis also determines how expected probability of default and loss given default will react to forecasted levels of the loss drivers. For all loan pools utilizing the DCF method, management utilizes and forecasts one or both of the following economic factors; national unemployment and gross domestic product as loss drivers.

For all DCF models, management has determined that four quarters represents a reasonable and supportable forecast period and reverts back to a historical loss rate over eight quarters on a straight-line basis. Management leverages economic projections from an independent third party to inform its loss driver forecasts over the four-quarter forecast period. Other internal and external indicators of economic forecasts are also considered by management when developing the forecast metrics. The model considers a base case forecast and two alternative forecasts and assigns weightings to these three scenarios based on current conditions and expectations for future conditions.

The combination of adjustments for credit expectations (default and loss) and timing expectations (prepayment, curtailment, and time to recovery) produces an expected cash flow stream at the instrument level. Instrument effective yield is calculated, net of the impacts of prepayment assumptions, and the instrument expected cash flows are then discounted at that effective yield to produce an instrument-level net present value of expected cash flows (“NPV”). An ACL is established for the difference between the instrument’s NPV and amortized cost basis.

The model also considers the need to qualitatively adjust expected loss estimates for information not already captured in the loss estimation process. These qualitative factors include those suggested by the Interagency Policy Statement on Allowances for Credit Losses. These qualitative factor adjustments may increase or decrease the Company's estimate of expected credit losses.

Loans that do not share common risk characteristics are evaluated on an individual basis. For collateral dependent financial assets where the Company has determined that foreclosure of the collateral is probable, or where the borrower is experiencing financial difficulty and the Company expects repayment of the financial asset to be provided substantially through the operation or sale of the collateral, the ACL is measured based on the difference between the fair value of the collateral less cost to sell, and the amortized cost basis of the asset as of the measurement date. The ACL may be zero if the fair value of the collateral at the measurement date exceeds the amortized cost basis of the financial asset.

The Company’s estimate of the ACL reflects losses expected over the remaining contractual life of the assets. The contractual term does not consider extensions, renewals or modifications unless the Company has identified an expected troubled debt restructuring.

A loan that has been modified or renewed is considered a troubled debt restructuring (“TDR”) when two conditions are met: 1) the borrower is experiencing financial difficulty and 2) concessions are made for the borrower's benefit that would not otherwise be considered for a borrower or transaction with similar credit risk characteristics. The Company’s ACL reflects all effects of a TDR when an individual asset is specifically identified as a reasonably expected TDR. The Company has determined that a TDR is reasonably expected no later than the point when the lender concludes that modification is the best

course of action and it is at least reasonably possible that the troubled borrower will accept some form of concession from the lender to avoid a default. Reasonably expected TDRs and executed non-performing TDRs are evaluated individually to determine the required ACL. TDRs performing in accordance with their modified contractual terms for a reasonable period of time may be included in the Company’s existing pools based on the underlying risk characteristics of the loan to measure the ACL. The provisions of the Coronavirus Aid, Relief and Economic Security Act ("CARES Act") and interagency guidance issued by Federal banking regulators provided guidance and clarification related to modifications and deferral programs to assist borrowers who are negatively impacted by the COVID-19 national emergency. The guidance and clarifications detail certain provisions whereby banks are permitted to make deferrals and modifications to the terms of a loan which would not require the loan to be reported as a troubled debt restructuring ('TDR"). In accordance with the CARES Act and the interagency guidance, the Company elected to adopt the provisions to not report qualified loan modifications as troubled debt restructurings.

Financial instruments include off-balance sheet credit instruments, such as commitments to make loans, unused lines of credit and commercial letters of credit, issued to meet customer financing needs. The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for off-balance sheet loan commitments is represented by the contractual amount of those instruments. Such financial instruments are recorded when they are funded.

The Company records an allowance for credit losses on off-balance sheet credit exposures, unless the commitments to extend credit are unconditionally cancellable, through a charge to the provision for credit loss expense for off-balance sheet credit exposures included in other noninterest expense in the Company’s consolidated statements of income. The ACL on off-balance sheet credit exposures is estimated by loan segment at each balance sheet date under the current expected credit loss model using similar methodologies as portfolio loans, taking into consideration the likelihood that funding will occur, and is included in other liabilities on the Company’s statements of condition.