Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2021
Accounting Policies [Abstract]
Consolidation, Policy [Policy Text Block]	Principles of Consolidation The consolidated financial statements include ChoiceOne Financial Services, Inc. ("ChoiceOne"), its wholly-owned subsidiary, ChoiceOne Bank (the "Bank"), and ChoiceOne Bank’s wholly-owned subsidiary ChoiceOne Insurance Agencies, Inc. (the "Insurance Agency"). Intercompany transactions and balances have been eliminated in consolidation. ChoiceOne owns all of the common securities of Community Shores Capital Trust I (the “Capital Trust”). Under U.S. generally accepted accounting principles ("GAAP"), the Capital Trust is not consolidated because it is a variable interest entity and ChoiceOne is not the primary beneficiary. The accompanying unaudited consolidated financial statements and notes thereto reflect all adjustments ordinary in nature which are, in the opinion of management, necessary for a fair presentation of the Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020, the Consolidated Statements of Income for the three and nine month periods ended September 30, 2021 and September 30, 2020, the Consolidated Statements of Comprehensive Income for the three and nine month periods ended September 30, 2021 and September 30, 2020, the Consolidated Statements of Changes in Shareholders’ Equity for the three and nine month periods ended September 30, 2021 and September 30, 2020, and the Consolidated Statements of Cash Flows for the nine-month periods ended September 30, 2021 and September 30, 2020. Operating results for the nine months ended September 30, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. The accompanying consolidated financial statements should be read in conjunction with the audited consolidated financial statements and footnotes thereto included in ChoiceOne’s Annual Report on Form 10-K for the year ended December 31, 2020.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates To prepare financial statements in conformity with GAAP, management makes estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided; therefore, future results could differ. These estimates and assumptions are subject to many risks and uncertainties, including changes in interest rates and other general economic, business and political conditions, including the effects of the COVID-19 pandemic, and its potential effects on the economic environment, our customers and our operations, as well as any changes to federal, state and local government laws, regulations and orders in connection with the COVID-19 pandemic. Actual results may differ from those estimates.
Mortgage Banking Activity [Policy Text Block]	Loans to Other Financial Institutions ChoiceOne Bank entered into an agreement with another financial institution to fund mortgage loans. Loans to other financial institutions are purchased participating interests in individual advances made to mortgage bankers nation-wide from an unaffiliated originating bank. The originating bank services these loans and cash flows on the individual advances (principal, interest, and fees) which are allocated pro-rata based on ownership in the participating interest, less fees paid for the servicing activity. The underlying collateral is generally made up of 1-4 family first residential mortgages owned by the mortgage banker and held for sale in the secondary market and have been underwritten using secondary market underwriting standards prior to purchasing the participating interest. Once the mortgage banker delivers the loan to the secondary market, the advance is required to be paid off, including ChoiceOne Bank’s participating interest. If the advance (in which ChoiceOne Bank has a participating interest) is outstanding over 90 days, the originating bank has the right to request the participating interest be paid off by the mortgage banker. The participating interests are held by 11 different mortgage bankers, with the largest creditor outstanding representing 17% of the total at September 30, 2021. Credit risk associated with the participating interest is measured as an allowance for loan losses when necessary. Losses are charged off against the allowance when incurred and recoveries of loan charge-offs are recorded when received. At least quarterly, ChoiceOne Bank reviews the portfolios of participating interests for potential losses including any participating interest that is outstanding over 90 days (even if the advance and participating interest is current). Loans to other financial institutions are excluded from the loans described in Note 3 to the interim consolidated financial statements. At September 30, 2021, there were no participating interests outstanding over 30 days. At December 31, 2020, 26 of the 218 participating interests with principal balances totaling $7.9 million had balances outstanding over 30 days. During the first nine months of 2020 and 2021, there were no losses or charge-offs of participating interests.
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	Allowance for Loan Losses The allowance for loan losses is maintained at a level believed adequate by management to absorb probable incurred losses inherent in the consolidated loan portfolio. Management’s evaluation of the adequacy of the allowance for loan losses is an estimate based on known and inherent risks in the portfolio, past loan loss experience, information about specific borrower situations and estimated collateral values, economic conditions and other relevant factors (including both qualitative and quantitative factors). Allocations of the allowance may be made for specific loans, but the entire allowance for loan losses is available for any loan that, in management’s judgment, should be charged-off. Loan losses are charged against the allowance when management believes the a loan balance is uncollectible. Management continues its collection efforts on previously charged-off loan balances and applies recoveries as additions to the allowance for loan losses. The allowance for loan losses consists of specific allocations for loans that are classified as impaired and pooled allocations for groups of homogeneous loans that are not impaired. A loan is considered impaired when, based on current information and events, management beleives it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement or if the loan is classified as a troubled debt restructuring. Loans for which the terms have been modified and a concession has been made, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings and classified as impaired. Groups of homogeneous loans receive allowance allocations based on historical loss experienced over a selected period. Management believes the accounting estimate related to the allowance for loan losses is a “critical accounting estimate” because (1) the estimate is highly susceptible to change from period to period because of assumptions concerning the changes in the types and volumes of the portfolios and economic conditions and (2) the impact of recognizing an impairment or loan loss could have a material effect on ChoiceOne’s assets reported on its balance sheet and its net income.
Stockholders' Equity, Policy [Policy Text Block]	Stock Transactions A total of 13,092 shares of common stock were issued to ChoiceOne’s Board of Directors for a cash price of $348,000 under the terms of the Directors’ Stock Purchase Plan in the first nine months of 2021. A total of 4,718 shares for a cash price of $104,000 were issued under the Employee Stock Purchase Plan in the first nine months of 2021. ChoiceOne repurchased approximately 223,000 shares for $5.6 million, or a weighted average all-in cost per share of $24.94, during the first nine months of 2021. This was part of the common stock repurchase program announced in April 2021 which authorized repurchases of up to 390,114 shares, representing 5% of the total outstanding shares of common stock as of the date the plan was adopted.
Share-based Payment Arrangement [Policy Text Block]	Stock-Based Compensation ChoiceOne grants restricted stock units to a select group of employees under the Stock Incentive Plan of 2012. All of the restricted stock units are initially unvested and vest three years after the grant date. Certain additional vesting provisions apply. Each unit, once vested, is settled by delivery of one share of ChoiceOne common stock.
Reclassification, Comparability Adjustment [Policy Text Block]	Reclassifications Certain amounts presented in prior periods have been reclassified to conform to the current presentation.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements The Financial Accounting Standards Board ("FASB") issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This ASU provides financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date by replacing the incurred loss impairment methodology in GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The new guidance attempts to reflect an entity’s current estimate of all expected credit losses and broadens the information that an entity must consider in developing its expected credit loss estimate for assets measured either collectively or individually to include forecasted information, as well as past events and current conditions. There is no specified method for measuring expected credit losses, and an entity may apply methods that reasonably reflect its expectations of the credit loss estimate. Although an entity may still use its current systems and methods for recording the allowance for credit losses, under the new rules, the inputs used to record the allowance for credit losses generally will need to change to appropriately reflect an estimate of all expected credit losses and the use of reasonable and supportable forecasts. Additionally, credit losses on available-for-sale debt securities will have to be presented as an allowance rather than as a write-down. This ASU is effective for fiscal years beginning after December 15, 2022, and for interim periods within those years for companies considered a smaller reporting company with the Securities and Exchange Commission. ChoiceOne was classified as a smaller reporting company as of the determination date of November 15, 2019. Management is currently evaluating the impact of this new ASU on its consolidated financial statements which may be significant.
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill Goodwill is not amortized but is evaluated annually for impairment and on an interim basis if events or changes in circumstances indicate that goodwill might be impaired. The goodwill impairment test is performed by comparing the fair value of a reporting unit with its carrying amount, and an impairment charge would be recognized for any amount by which the carrying amount exceeds the reporting unit's fair value. Accounting pronouncements allow a company to first perform a qualitative assessment for goodwill prior to a quantitative assessment (Step 1 assessment). If the results of the qualitative assessment indicate that it is more likely than not that goodwill is impaired, then a quantitative assessment must be performed. If not, there is no further assessment required. ChoiceOne acquired Valley Ridge Financial Corp. in 2006, County in 2019, and Community Shores in 2020, which resulted in the recognition of goodwill of $13.7 million, $38.9 million and $7.3 million, respectively. Management performed its annual qualitative assessment of goodwill as of June 30, 2021. In evaluating whether it is more likely than not that the fair value of ChoiceOne's operations was less than the carrying amount, management assessed the relevant events and circumstances such as the ones noted in ASC 350-20-35-3c. The analysis consisted of a review of ChoiceOne’s current and expected future financial performance, the potential impact of the COVID-19 pandemic on the ability of ChoiceOne’s borrowers to comply with loan terms, and the impact that reductions in both short-term and long-term interest rates have had and may continue to have on net interest margin and mortgage sales activity. The share price and book value of ChoiceOne’s stock were also compared to the prior year. Management also compared average deal values for recent closed bank transactions to ChoiceOne transactions. Despite ChoiceOne's market capitalization declining slightly from November 30, 2020 to June 30, 2021, ChoiceOne's financial performance remained positive. In assessing the totality of the events and circumstances, management determined that it was more likely than not that the fair value of ChoiceOne’s operations, from a qualitative perspective, exceeded the carrying value as of June 30, 2021 and impairment of goodwill was not necessary. ChoiceOne’s stock price per share was less than its book value as of September 30, 2021. This indicated that goodwill may be impaired and resulted in management performing another qualitative goodwill impairment assessment as of the end of the third quarter of 2021. As a result of the analysis, management concluded that it was more-likely-than-not that the fair value of the reporting unit was greater than the carrying value. This was evidenced by the strong financial indicators, solid credit quality ratios, as well as the strong capital position of ChoiceOne. In addition, revenue in the first nine months of 2021 reflected significant and continuing growth in ChoiceOne's interest income, as well as net Small Business Administration fees related to Paycheck Protection Program loans. Based on the results of the qualitative analysis, management believed that a quantitative analysis was not necessary as of September 30, 2021.

Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2021

Consolidation, Policy [Policy Text Block]

Principles of Consolidation

The consolidated financial statements include ChoiceOne Financial Services, Inc. ("ChoiceOne"), its wholly-owned subsidiary, ChoiceOne Bank (the "Bank"), and ChoiceOne Bank’s wholly-owned subsidiary ChoiceOne Insurance Agencies, Inc. (the "Insurance Agency"). Intercompany transactions and balances have been eliminated in consolidation.

ChoiceOne owns all of the common securities of Community Shores Capital Trust I (the “Capital Trust”). Under U.S. generally accepted accounting principles ("GAAP"), the Capital Trust is not consolidated because it is a variable interest entity and ChoiceOne is not the primary beneficiary.

The accompanying unaudited consolidated financial statements and notes thereto reflect all adjustments ordinary in nature which are, in the opinion of management, necessary for a fair presentation of the Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020, the Consolidated Statements of Income for the three and nine month periods ended September 30, 2021 and September 30, 2020, the Consolidated Statements of Comprehensive Income for the three and nine month periods ended September 30, 2021 and September 30, 2020, the Consolidated Statements of Changes in Shareholders’ Equity for the three and nine month periods ended September 30, 2021 and September 30, 2020, and the Consolidated Statements of Cash Flows for the nine-month periods ended September 30, 2021 and September 30, 2020. Operating results for the nine months ended September 30, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021.

The accompanying consolidated financial statements should be read in conjunction with the audited consolidated financial statements and footnotes thereto included in ChoiceOne’s Annual Report on Form 10-K for the year ended December 31, 2020.

Use of Estimates, Policy [Policy Text Block]

Use of Estimates

To prepare financial statements in conformity with GAAP, management makes estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided; therefore, future results could differ. These estimates and assumptions are subject to many risks and uncertainties, including changes in interest rates and other general economic, business and political conditions, including the effects of the COVID-19 pandemic, and its potential effects on the economic environment, our customers and our operations, as well as any changes to federal, state and local government laws, regulations and orders in connection with the COVID-19 pandemic. Actual results may differ from those estimates.

Mortgage Banking Activity [Policy Text Block]

Loans to Other Financial Institutions

ChoiceOne Bank entered into an agreement with another financial institution to fund mortgage loans. Loans to other financial institutions are purchased participating interests in individual advances made to mortgage bankers nation-wide from an unaffiliated originating bank. The originating bank services these loans and cash flows on the individual advances (principal, interest, and fees) which are allocated pro-rata based on ownership in the participating interest, less fees paid for the servicing activity. The underlying collateral is generally made up of 1-4 family first residential mortgages owned by the mortgage banker and held for sale in the secondary market and have been underwritten using secondary market underwriting standards prior to purchasing the participating interest. Once the mortgage banker delivers the loan to the secondary market, the advance is required to be paid off, including ChoiceOne Bank’s participating interest. If the advance (in which ChoiceOne Bank has a participating interest) is outstanding over 90 days, the originating bank has the right to request the participating interest be paid off by the mortgage banker. The participating interests are held by 11 different mortgage bankers, with the largest creditor outstanding representing 17% of the total at September 30, 2021.

Credit risk associated with the participating interest is measured as an allowance for loan losses when necessary. Losses are charged off against the allowance when incurred and recoveries of loan charge-offs are recorded when received. At least quarterly, ChoiceOne Bank reviews the portfolios of participating interests for potential losses including any participating interest that is outstanding over 90 days (even if the advance and participating interest is current). Loans to other financial institutions are excluded from the loans described in Note 3 to the interim consolidated financial statements. At September 30, 2021, there were no participating interests outstanding over 30 days. At December 31, 2020, 26 of the 218 participating interests with principal balances totaling $7.9 million had balances outstanding over 30 days. During the first nine months of 2020 and 2021, there were no losses or charge-offs of participating interests.

Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]

Allowance for Loan Losses

The allowance for loan losses is maintained at a level believed adequate by management to absorb probable incurred losses inherent in the consolidated loan portfolio. Management’s evaluation of the adequacy of the allowance for loan losses is an estimate based on known and inherent risks in the portfolio, past loan loss experience, information about specific borrower situations and estimated collateral values, economic conditions and other relevant factors (including both qualitative and quantitative factors). Allocations of the allowance may be made for specific loans, but the entire allowance for loan losses is available for any loan that, in management’s judgment, should be charged-off. Loan losses are charged against the allowance when management believes the a loan balance is uncollectible. Management continues its collection efforts on previously charged-off loan balances and applies recoveries as additions to the allowance for loan losses.

The allowance for loan losses consists of specific allocations for loans that are classified as impaired and pooled allocations for groups of homogeneous loans that are not impaired. A loan is considered impaired when, based on current information and events, management beleives it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement or if the loan is classified as a troubled debt restructuring. Loans for which the terms have been modified and a concession has been made, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings and classified as impaired. Groups of homogeneous loans receive allowance allocations based on historical loss experienced over a selected period.

Management believes the accounting estimate related to the allowance for loan losses is a “critical accounting estimate” because (1) the estimate is highly susceptible to change from period to period because of assumptions concerning the changes in the types and volumes of the portfolios and economic conditions and (2) the impact of recognizing an impairment or loan loss could have a material effect on ChoiceOne’s assets reported on its balance sheet and its net income.

Stockholders' Equity, Policy [Policy Text Block]

Stock Transactions

A total of 13,092 shares of common stock were issued to ChoiceOne’s Board of Directors for a cash price of $348,000 under the terms of the Directors’ Stock Purchase Plan in the first nine months of 2021. A total of 4,718 shares for a cash price of $104,000 were issued under the Employee Stock Purchase Plan in the first nine months of 2021. ChoiceOne repurchased approximately 223,000 shares for $5.6 million, or a weighted average all-in cost per share of $24.94, during the first nine months of 2021. This was part of the common stock repurchase program announced in April 2021 which authorized repurchases of up to 390,114 shares, representing 5% of the total outstanding shares of common stock as of the date the plan was adopted.

Share-based Payment Arrangement [Policy Text Block]

Stock-Based Compensation

ChoiceOne grants restricted stock units to a select group of employees under the Stock Incentive Plan of 2012. All of the restricted stock units are initially unvested and vest three years after the grant date. Certain additional vesting provisions apply. Each unit, once vested, is settled by delivery of one share of ChoiceOne common stock.

Reclassification, Comparability Adjustment [Policy Text Block]

Reclassifications

Certain amounts presented in prior periods have been reclassified to conform to the current presentation.

New Accounting Pronouncements, Policy [Policy Text Block]

Recent Accounting Pronouncements

The Financial Accounting Standards Board ("FASB") issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This ASU provides financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date by replacing the incurred loss impairment methodology in GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The new guidance attempts to reflect an entity’s current estimate of all expected credit losses and broadens the information that an entity must consider in developing its expected credit loss estimate for assets measured either collectively or individually to include forecasted information, as well as past events and current conditions. There is no specified method for measuring expected credit losses, and an entity may apply methods that reasonably reflect its expectations of the credit loss estimate. Although an entity may still use its current systems and methods for recording the allowance for credit losses, under the new rules, the inputs used to record the allowance for credit losses generally will need to change to appropriately reflect an estimate of all expected credit losses and the use of reasonable and supportable forecasts. Additionally, credit losses on available-for-sale debt securities will have to be presented as an allowance rather than as a write-down. This ASU is effective for fiscal years beginning after December 15, 2022, and for interim periods within those years for companies considered a smaller reporting company with the Securities and Exchange Commission. ChoiceOne was classified as a smaller reporting company as of the determination date of November 15, 2019. Management is currently evaluating the impact of this new ASU on its consolidated financial statements which may be significant.

Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]

Goodwill

Goodwill is not amortized but is evaluated annually for impairment and on an interim basis if events or changes in circumstances indicate that goodwill might be impaired. The goodwill impairment test is performed by comparing the fair value of a reporting unit with its carrying amount, and an impairment charge would be recognized for any amount by which the carrying amount exceeds the reporting unit's fair value. Accounting pronouncements allow a company to first perform a qualitative assessment for goodwill prior to a quantitative assessment (Step 1 assessment). If the results of the qualitative assessment indicate that it is more likely than not that goodwill is impaired, then a quantitative assessment must be performed. If not, there is no further assessment required. ChoiceOne acquired Valley Ridge Financial Corp. in 2006, County in 2019, and Community Shores in 2020, which resulted in the recognition of goodwill of $13.7 million, $38.9 million and $7.3 million, respectively.

Management performed its annual qualitative assessment of goodwill as of June 30, 2021. In evaluating whether it is more likely than not that the fair value of ChoiceOne's operations was less than the carrying amount, management assessed the relevant events and circumstances such as the ones noted in ASC 350-20-35-3c. The analysis consisted of a review of ChoiceOne’s current and expected future financial performance, the potential impact of the COVID-19 pandemic on the ability of ChoiceOne’s borrowers to comply with loan terms, and the impact that reductions in both short-term and long-term interest rates have had and may continue to have on net interest margin and mortgage sales activity. The share price and book value of ChoiceOne’s stock were also compared to the prior year. Management also compared average deal values for recent closed bank transactions to ChoiceOne transactions. Despite ChoiceOne's market capitalization declining slightly from November 30, 2020 to June 30, 2021, ChoiceOne's financial performance remained positive. In assessing the totality of the events and circumstances, management determined that it was more likely than not that the fair value of ChoiceOne’s operations, from a qualitative perspective, exceeded the carrying value as of June 30, 2021 and impairment of goodwill was not necessary.

ChoiceOne’s stock price per share was less than its book value as of September 30, 2021. This indicated that goodwill may be impaired and resulted in management performing another qualitative goodwill impairment assessment as of the end of the third quarter of 2021. As a result of the analysis, management concluded that it was more-likely-than-not that the fair value of the reporting unit was greater than the carrying value. This was evidenced by the strong financial indicators, solid credit quality ratios, as well as the strong capital position of ChoiceOne. In addition, revenue in the first nine months of 2021 reflected significant and continuing growth in ChoiceOne's interest income, as well as net Small Business Administration fees related to Paycheck Protection Program loans. Based on the results of the qualitative analysis, management believed that a quantitative analysis was not necessary as of September 30, 2021.