Summary of Significant Accounting Policies and New Accounting Pronouncements (Tables)

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Charge-Off and Nonaccrual Policies and Practices by Product

Our charge-off and nonaccrual policies differ by product and are summarized below:

Product	Charge-off Policies and Practices	Nonaccrual Policies and Practices
Commercial Loans Real estate, including construction Business and corporate banking Other commercial	Commercial loan balances are charged off at the time all or a portion of the balance is deemed uncollectible. For loans secured with collateral, loan balances are generally written down to the estimated fair value of the collateral less costs to sell.	Loans are generally categorized as nonaccruing when contractually delinquent for more than three months or in the opinion of management, reasonable doubt exists with respect to the ultimate collectibility of interest or principal based on certain factors including the period of time past due and adequacy of collateral. When classified as nonaccruing, any accrued interest recorded on the loan is generally deemed uncollectible and reversed against income. Interest income is subsequently recognized only to the extent of cash received until the loan is placed on accrual status. In instances where there is doubt as to collectibility of principal, interest payments received are applied to principal. Loans are not reclassified as accruing until interest and principal payments are current and future payments are reasonably assured.
Residential Mortgage Loans	Carrying amounts in excess of fair value less costs to sell are generally charged off at the time foreclosure is initiated or when settlement is reached with the borrower, but not to exceed the end of the month in which the account becomes six months contractually delinquent. If foreclosure is not pursued and there is no reasonable expectation for recovery, the account is generally charged off no later than the end of the month in which the account becomes six months contractually delinquent.(1)	Loans are generally designated as nonaccruing when contractually delinquent for more than three months. When classified as nonaccruing, any accrued interest on the loan is generally deemed uncollectible and reversed against income. Interest accruals are resumed when the loan either becomes current or becomes less than three months delinquent and six months of consecutive payments have been made.
Other Consumer Loans	Loan balances are generally charged off by the end of the month in which the account becomes six months contractually delinquent for home equity mortgages and credit cards, and four months contractually delinquent for other unsecured consumer loans.	Interest generally accrues until charge-off. For home equity mortgages, loans are generally designated as nonaccruing when contractually delinquent for more than three months.

(1)Values are determined based upon broker price opinions or appraisals which are updated at least every 180 days less estimated costs to sell. During the quarterly period between updates, real estate price trends are reviewed on a geographic basis and additional downward adjustments are recorded as necessary. Fair values of foreclosed properties at the time of acquisition are initially determined based upon broker price opinions. Subsequent to acquisition, a more detailed property valuation is performed, reflecting information obtained from a walk-through of the property in the form of a listing agent broker price opinion as well as an independent broker price opinion or appraisal. A valuation is determined from this information within 90 days and any additional write-downs required are recorded through charge-off at that time.

New Accounting Pronouncements

The following new accounting pronouncement was adopted during 2025:

Accounting Standards Update	Summary of Guidance	Financial Statement Impact
Improvements to Income Tax Disclosures Issued December 2023	•Eliminates, amends and adds certain disclosure requirements for income taxes. •In particular, requires the disaggregation of certain existing disclosures, including a) the effective tax rate reconciliation to be broken out into specific categories; and b) income taxes paid and income tax expense to be broken out between federal, state and foreign.	•We elected to adopt this guidance retrospectively. While adoption of this guidance resulted in changes to existing disclosures, it did not have any impact on our financial position or results of operations. •See Note 16, "Income Taxes," for the new disclosures required by this standard.

The following are new accounting pronouncements issued by the Financial Accounting Standards Board which will be adopted in future periods:

Accounting Standards Update	Summary of Guidance	Financial Statement Impact
Disaggregation of Income Statement Expenses Issued November 2024	•Requires certain expense captions presented on the face of the income statement to be disaggregated into specific categories in the notes to the financial statements, including a) employee compensation; b) depreciation; and c) intangible asset amortization. A description of the amounts that are not separately disaggregated should be disclosed. •Also requires disclosure of the total amount of selling expenses and the entity's definition of selling expenses.	•Effective for annual periods beginning January 1, 2027, and interim periods beginning January 1, 2028, with early adoption permitted. •The new guidance should be applied prospectively, with a retrospective option. •While the adoption of this guidance will result in changes to existing disclosures, it will not have any impact on our financial position or results of operations.
Targeted Improvements to the Accounting for Internal-Use Software Issued September 2025	•Improves the operability of the software accounting guidance by removing all references to software development project stages. Therefore, an entity is required to capitalize software costs when a) management has authorized and committed to funding the software project and b) it is probable that the project will be completed and the software will be used to perform the function intended. •Also clarifies that the disclosures required for property, plant and equipment must also be provided for capitalized internal-use software costs.	•Effective for annual and interim periods beginning January 1, 2028, with early adoption permitted. •The new guidance may be applied either retrospectively, prospectively to software costs incurred after the adoption date, or on a modified prospective basis. •While the adoption of this guidance will result in changes to existing disclosures, we are currently evaluating the impact it will have on our financial position or results of operations.