SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include ChoiceOne Financial Services, Inc. ("ChoiceOne"), its wholly-owned subsidiary, ChoiceOne Bank, and ChoiceOne Bank’s wholly-owned subsidiary, ChoiceOne Insurance Agencies, Inc. For periods after September 30, 2020, the consolidated financial statements also include ChioceOne's wholly owned subsidiary, Lakestone Bank & Trust (together with ChoiceOne Bank, the "Banks") and Lakestone Bank & Trust's wholly-owned subsidiary, Lakestone Financial Services, Inc., as a result of the merger of County Bank Corp. with and into ChoiceOne. Intercompany transactions and balances have been eliminated in consolidation. The consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information, prevailing practices within the banking industry and the instructions to Form 10-Q. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. The accompanying consolidated financial statements 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 March 31, 2020 and December 31, 2019, the Consolidated Statements of Income for the three-month periods ended March 31, 2020 and March 31, 2019, the Consolidated Statements of Comprehensive Income for the three-month periods ended March 31, 2020 and March 31, 2019, the Consolidated Statements of Changes in Shareholders’ Equity for the three-month periods ended March 31, 2020 and March 31, 2019, and the Consolidated Statements of Cash Flows for the three-month periods ended March 31, 2020 and March 31, 2019. Operating results for the three months ended March 31, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020. The accompanying consolidated financial statements should be read in conjunction with the consolidated financial statements and footnotes thereto included in ChoiceOne’s Annual Report on Form 10-K for the year ended December 31, 2019.
Loans to Other Financial Institutions	Loans to Other Financial Institutions The Banks entered into agreements 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 the Bank’s participating interest. If the advance (in which one of the Banks 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 subject to concentration risk to 15 different mortgage bankers, with the largest creditor outstanding representing 15% of the total at March 31, 2020. Credit risk associated with the participating interest is measured as an allowance for loan loss when necessary. Losses are charged off against the allowance when incurred and recoveries of loan charge-offs are recorded when received. At least quarterly, the Banks review 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). At March 31, 2020, 11 of the 322 participating interests with principal balances totaling $2.3 million had balances outstanding over 30 days. During the first three months of 2020, there were no losses or charge-offs of participating interests.
Allowance for Loan Losses	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 is an estimate based on reviews of individual loans, assessments of the impact of current economic conditions on the portfolio and historical loss experience of seasoned loan portfolios. See Note 3 to the interim consolidated financial statements for additional information. 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 the balance sheets as well as its net income.
Stock Transactions	Stock Transactions A total of 2,615 shares of common stock were issued to ChoiceOne’s Board of Directors for a cash price of $83,000 under the terms of the Directors’ Stock Purchase Plan in the first quarter of 2020. A total of 1,041 shares for a cash price of $23,000 were issued under the Employee Stock Purchase Plan in the first quarter of 2020. Shares issued upon the exercise of stock options, net of shares withheld for payment for the options, totaled 789 in the first quarter of 2020.
Stock-Based Compensation	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 in three annual installments on each of the next three anniversaries of the grant date. Certain additional vesting provisions apply. Each unit, once vested, is settled by delivery of one share of ChoiceOne common stock.
Reclassifications	Reclassifications Certain amounts presented in prior periods have been reclassified to conform to the current presentation.
Recent Accounting Pronouncements	Recent Accounting Pronouncements The 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 current generally accepted accounting principles (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 December 31, 2019. Management is currently evaluating the impact of this new ASU on its consolidated financial statements which may be significant. FASB pronouncement ASU 2017-04 (topic 350) is effective for fiscal years beginning after December 15, 2019. To simplify the subsequent measurement of goodwill, the Board eliminated Step 2 from the goodwill impairment test. Previously, in computing the implied fair value of goodwill under Step 2, an entity had to perform procedures to determine the fair value at the impairment testing date of its assets and liabilities (including unrecognized assets and liabilities) following the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination. Instead, under the amendments in ASU 2017-04, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax-deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The Board also eliminated the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step 2 of the goodwill impairment test. Therefore, the same impairment assessment applies to all reporting units. An entity is required to disclose the amount of goodwill allocated to each reporting unit with a zero or negative carrying amount of net assets. ChoiceOne performed a step zero during the current quarter and determined no impairment was necessary. Refer to testing performed in the Goodwill section below.
Goodwill	Goodwill ChoiceOne evaluates goodwill annually for impairment. 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. Management performed its annual qualitative assessment of goodwill as of June 30, 2019. As a result of the impact of the emergence of the COVID-19 pandemic in the first quarter of 2020, management believed it was prudent to perform an interim qualitative assessment as of March 31, 2020. The analysis consisted of a review of ChoiceOne’s current and expected future financial performance, the potential impact of COVID-19 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. Upon completion of the qualitative assessment, ChoiceOne believed that it was more likely than not that the fair value of ChoiceOne’s equity exceeded the carrying value as of March 31, 2020 and there was no further quantitative assessment necessary. If COVID-19 causes a prolonged economic downturn, ChoiceOne may perform additional interim assessments of its goodwill balance in future periods.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

3 Months Ended

Mar. 31, 2020

The consolidated financial statements include ChoiceOne Financial Services, Inc. ("ChoiceOne"), its wholly-owned subsidiary, ChoiceOne Bank, and ChoiceOne Bank’s wholly-owned subsidiary, ChoiceOne Insurance Agencies, Inc. For periods after September 30, 2020, the consolidated financial statements also include ChioceOne's wholly owned subsidiary, Lakestone Bank & Trust (together with ChoiceOne Bank, the "Banks") and Lakestone Bank & Trust's wholly-owned subsidiary, Lakestone Financial Services, Inc., as a result of the merger of County Bank Corp. with and into ChoiceOne. Intercompany transactions and balances have been eliminated in consolidation.

The consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information, prevailing practices within the banking industry and the instructions to Form 10-Q. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

The accompanying consolidated financial statements 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 March 31, 2020 and December 31, 2019, the Consolidated Statements of Income for the three-month periods ended March 31, 2020 and March 31, 2019, the Consolidated Statements of Comprehensive Income for the three-month periods ended March 31, 2020 and March 31, 2019, the Consolidated Statements of Changes in Shareholders’ Equity for the three-month periods ended March 31, 2020 and March 31, 2019, and the Consolidated Statements of Cash Flows for the three-month periods ended March 31, 2020 and March 31, 2019. Operating results for the three months ended March 31, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020.

The accompanying consolidated financial statements should be read in conjunction with the consolidated financial statements and footnotes thereto included in ChoiceOne’s Annual Report on Form 10-K for the year ended December 31, 2019.

Loans to Other Financial Institutions

The Banks entered into agreements 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 the Bank’s participating interest. If the advance (in which one of the Banks 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 subject to concentration risk to 15 different mortgage bankers, with the largest creditor outstanding representing 15% of the total at March 31, 2020.

Credit risk associated with the participating interest is measured as an allowance for loan loss when necessary. Losses are charged off against the allowance when incurred and recoveries of loan charge-offs are recorded when received. At least quarterly, the Banks review 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). At March 31, 2020, 11 of the 322 participating interests with principal balances totaling $2.3 million had balances outstanding over 30 days. During the first three months of 2020, there were no losses or charge-offs of participating interests.

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 is an estimate based on reviews of individual loans, assessments of the impact of current economic conditions on the portfolio and historical loss experience of seasoned loan portfolios. See Note 3 to the interim consolidated financial statements for additional information.

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 the balance sheets as well as its net income.

Stock Transactions

A total of 2,615 shares of common stock were issued to ChoiceOne’s Board of Directors for a cash price of $83,000 under the terms of the Directors’ Stock Purchase Plan in the first quarter of 2020. A total of 1,041 shares for a cash price of $23,000 were issued under the Employee Stock Purchase Plan in the first quarter of 2020. Shares issued upon the exercise of stock options, net of shares withheld for payment for the options, totaled 789 in the first quarter of 2020.

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 in three annual installments on each of the next three anniversaries of the grant date. Certain additional vesting provisions apply. Each unit, once vested, is settled by delivery of one share of ChoiceOne common stock.

Reclassifications

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

Recent Accounting Pronouncements

The 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 current generally accepted accounting principles (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 December 31, 2019. Management is currently evaluating the impact of this new ASU on its consolidated financial statements which may be significant.

FASB pronouncement ASU 2017-04 (topic 350) is effective for fiscal years beginning after December 15, 2019. To simplify the subsequent measurement of goodwill, the Board eliminated Step 2 from the goodwill impairment test. Previously, in computing the implied fair value of goodwill under Step 2, an entity had to perform procedures to determine the fair value at the impairment testing date of its assets and liabilities (including unrecognized assets and liabilities) following the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination. Instead, under the amendments in ASU 2017-04, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax-deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The Board also eliminated the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step 2 of the goodwill impairment test. Therefore, the same impairment assessment applies to all reporting units. An entity is required to disclose the amount of goodwill allocated to each reporting unit with a zero or negative carrying amount of net assets. ChoiceOne performed a step zero during the current quarter and determined no impairment was necessary. Refer to testing performed in the Goodwill section below.

Goodwill

ChoiceOne evaluates goodwill annually for impairment. 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.

Management performed its annual qualitative assessment of goodwill as of June 30, 2019. As a result of the impact of the emergence of the COVID-19 pandemic in the first quarter of 2020, management believed it was prudent to perform an interim qualitative assessment as of March 31, 2020. The analysis consisted of a review of ChoiceOne’s current and expected future financial performance, the potential impact of COVID-19 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. Upon completion of the qualitative assessment, ChoiceOne believed that it was more likely than not that the fair value of ChoiceOne’s equity exceeded the carrying value as of March 31, 2020 and there was no further quantitative assessment necessary. If COVID-19 causes a prolonged economic downturn, ChoiceOne may perform additional interim assessments of its goodwill balance in future periods.