Summary of Significant Accounting Policies	9 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	NOTE 1 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES The accompanying condensed consolidated financial statements include the accounts of CSB Bancorp, Inc. and its wholly-owned subsidiaries, The Commercial and Savings Bank (the “Bank”) and CSB Investment Services, LLC (together referred to as the “Company” or “CSB”). All significant intercompany transactions and balances have been eliminated in consolidation. The condensed consolidated financial statements have been prepared without audit. In the opinion of management, all adjustments (which include normal recurring adjustments) necessary to present fairly the Company’s financial position at September 30, 2017, and the results of operations and changes in cash flows for the periods presented have been made. Certain information and footnote disclosures typically included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) have been omitted. The Annual Report for CSB for the year ended December 31, 2016, contains Consolidated Financial Statements and related footnote disclosures, which should be read in conjunction with the accompanying Consolidated Financial Statements. The results of operations for the period ended September 30, 2017 are not necessarily indicative of the operating results for the full year or any future interim period. Certain items in the prior-year financial statements were reclassified to conform to the current-year presentation. RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS ASU 2014-09 - Revenue from Contracts with Customers. The amendments in ASU 2014-09 require an entity to recognize revenue upon the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In addition, this Update specifies the accounting for certain costs to obtain or fulfill a contract with a customer and expands disclosure requirements for revenue recognition. FASB issued a one-year deferral for implementation, for public entities with a calendar year-end, the new guidance is effective in the quarter and year beginning January 1, 2018. Because the guidance does not apply to revenue associated with financial instruments, including loans and securities, we do not expect the new standard, or any of the amendments, to result in a material change from our current accounting for revenue because the majority of the Company’s financial instruments are not within the scope of Topic 606. However, we do expect that the standard will result in new disclosure requirements, which are currently being evaluated. ASU 2016-01 - Recognition and Measurement of Financial Assets and Financial Liabilities. This Update sets forth targeted improvements to GAAP including, but not limited to, requiring an entity to recognize the changes in fair value of equity investments in the income statement, requiring public business entities to use the exit price when measuring the fair value of financial instruments for financial statement disclosure purposes, eliminating certain disclosures required by existing GAAP, and providing for additional disclosures. The Update is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company is currently evaluating the impact the adoption of the standard will have on the Company’s financial position or results of operations. ASU 2016-02 – Leases. This Update sets forth a new lease accounting model for lessors and lessees. For lessees, virtually all leases will be required to be recognized on the balance sheet by recording a right-of-use asset. Subsequent accounting for leases varies depending on whether the lease is an operating lease or a finance lease. The accounting provided by a lessor is largely unchanged from that applied under the existing guidance. The ASU requires additional qualitative and quantitative disclosures with the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The Update is effective for fiscal years beginning after December 15, 2018, with early application permitted. Based on the Company’s preliminary analysis of its current portfolio, the impact to the Company’s balance sheet is estimated to result in less than a 1 percent increase in assets and liabilities. This Update is not expected to have a significant impact on the Company’s financial statements. ASU 2016-13 - Financial Instruments - Credit Losses. The Update requires that financial assets be presented at the net amount expected to be collected (i.e. net of expected credit losses), eliminating the probable recognition threshold for credit losses on financial assets measured at amortized cost. The measurement of expected credit losses should be based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The Update is effective for annual and interim periods beginning after December 15, 2019. Early adoption is permitted for annual and interim periods beginning after December 15, 2018. We expect the Update will result in an increase in the allowance for credit losses for the estimated life of the financial asset, including an estimate for debt securities. The amount of the increase will be impacted by the portfolio composition and quality at the adoption date, as well as economic conditions and forecasts at that time. A cumulative-effect adjustment to retained earnings is required as of the beginning of the year of adoption. The Company expects to recognize a one-time cumulative effect adjustment to the allowance for loan losses, but cannot yet determine the magnitude of any such one-time adjustment or the overall impact of the new guidance on the consolidated financial statements. ASU 2016-15 - Classification of Certain Cash Receipts and Cash Payments. The amendments in this Update add or clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. Current guidance lacks consistent principles for evaluating the classification of cash payments and receipts in the statement of cash flows. FASB issued the ASU with the intent of reducing diversity in practice with respect to several types of cash flows. The amendments in this Update are effective using a retrospective transition approach for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The Company is currently evaluating the impact the adoption of the standard will have on the Company’s statement of cash flows. ASU 2017-04 - Simplifying the Test for Goodwill Impairment. The Update simplifies the goodwill impairment test. Under the new guidance, Step 2 of the goodwill impairment process that requires an entity to determine the implied fair value of its goodwill by assigning fair value to all its assets and liabilities is eliminated. Instead, the entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The new guidance is effective for annual and interim goodwill tests performed in fiscal years beginning after December 15, 2019. Early adoption is permitted. This Update is not expected to have a material impact on the Company’s financial statements.

NOTE 1 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

The accompanying condensed consolidated financial statements include the accounts of CSB Bancorp, Inc. and its wholly-owned subsidiaries, The Commercial and Savings Bank (the “Bank”) and CSB Investment Services, LLC (together referred to as the “Company” or “CSB”). All significant intercompany transactions and balances have been eliminated in consolidation.

The condensed consolidated financial statements have been prepared without audit. In the opinion of management, all adjustments (which include normal recurring adjustments) necessary to present fairly the Company’s financial position at September 30, 2017, and the results of operations and changes in cash flows for the periods presented have been made.

Certain information and footnote disclosures typically included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) have been omitted. The Annual Report for CSB for the year ended December 31, 2016, contains Consolidated Financial Statements and related footnote disclosures, which should be read in conjunction with the accompanying Consolidated Financial Statements. The results of operations for the period ended September 30, 2017 are not necessarily indicative of the operating results for the full year or any future interim period.

Certain items in the prior-year financial statements were reclassified to conform to the current-year presentation.

RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS

ASU 2014-09 - Revenue from Contracts with Customers. The amendments in ASU 2014-09 require an entity to recognize revenue upon the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In addition, this Update specifies the accounting for certain costs to obtain or fulfill a contract with a customer and expands disclosure requirements for revenue recognition. FASB issued a one-year deferral for implementation, for public entities with a calendar year-end, the new guidance is effective in the quarter and year beginning January 1, 2018. Because the guidance does not apply to revenue associated with financial instruments, including loans and securities, we do not expect the new standard, or any of the amendments, to result in a material change from our current accounting for revenue because the majority of the Company’s financial instruments are not within the scope of Topic 606. However, we do expect that the standard will result in new disclosure requirements, which are currently being evaluated.

ASU 2016-01 - Recognition and Measurement of Financial Assets and Financial Liabilities. This Update sets forth targeted improvements to GAAP including, but not limited to, requiring an entity to recognize the changes in fair value of equity investments in the income statement, requiring public business entities to use the exit price when measuring the fair value of financial instruments for financial statement disclosure purposes, eliminating certain disclosures required by existing GAAP, and providing for additional disclosures. The Update is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company is currently evaluating the impact the adoption of the standard will have on the Company’s financial position or results of operations.

ASU 2016-02 – Leases. This Update sets forth a new lease accounting model for lessors and lessees. For lessees, virtually all leases will be required to be recognized on the balance sheet by recording a right-of-use asset. Subsequent accounting for leases varies depending on whether the lease is an operating lease or a finance lease. The accounting provided by a lessor is largely unchanged from that applied under the existing guidance. The ASU requires additional qualitative and quantitative disclosures with the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The Update is effective for fiscal years beginning after December 15, 2018, with early application permitted. Based on the Company’s preliminary analysis of its current portfolio, the impact to the Company’s balance sheet is estimated to result in less than a 1 percent increase in assets and liabilities. This Update is not expected to have a significant impact on the Company’s financial statements.

ASU 2016-13 - Financial Instruments - Credit Losses. The Update requires that financial assets be presented at the net amount expected to be collected (i.e. net of expected credit losses), eliminating the probable recognition threshold for credit losses on financial assets measured at amortized cost. The measurement of expected credit losses should be based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The Update is effective for annual and interim periods beginning after December 15, 2019. Early adoption is permitted for annual and interim periods beginning after December 15, 2018. We expect the Update will result in an increase in the allowance for credit losses for the estimated life of the financial asset, including an estimate for debt securities. The amount of the increase will be impacted by the portfolio composition and quality at the adoption date, as well as economic conditions and forecasts at that time. A cumulative-effect adjustment to retained earnings is required as of the beginning of the year of adoption. The Company expects to recognize a one-time cumulative effect adjustment to the allowance for loan losses, but cannot yet determine the magnitude of any such one-time adjustment or the overall impact of the new guidance on the consolidated financial statements.

ASU 2016-15 - Classification of Certain Cash Receipts and Cash Payments. The amendments in this Update add or clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. Current guidance lacks consistent principles for evaluating the classification of cash payments and receipts in the statement of cash flows. FASB issued the ASU with the intent of reducing diversity in practice with respect to several types of cash flows. The amendments in this Update are effective using a retrospective transition approach for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The Company is currently evaluating the impact the adoption of the standard will have on the Company’s statement of cash flows.

ASU 2017-04 - Simplifying the Test for Goodwill Impairment. The Update simplifies the goodwill impairment test. Under the new guidance, Step 2 of the goodwill impairment process that requires an entity to determine the implied fair value of its goodwill by assigning fair value to all its assets and liabilities is eliminated. Instead, the entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The new guidance is effective for annual and interim goodwill tests performed in fiscal years beginning after December 15, 2019. Early adoption is permitted. This Update is not expected to have a material impact on the Company’s financial statements.