Cover [Abstract] Document Information [Table] Document Information [Line Items] Document Type Document Period End Date Entity Registrant Name Title of 12(b) Security Trading Symbol Security Exchange Name Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period Entity Shell Company Entity Common Stock, Shares Outstanding Entity Central Index Key Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Statement of Financial Position [Abstract] Assets [Abstract] Assets Cash and Due from Banks Cash and due from banks Debt Securities, Available-for-sale Available for sale securities (at fair value) Fair Value Fair Value Loans and Leases Receivable, Net Amount Total net loans Loans receivable (net of allowance for loan losses of $10,563 and $5,954, respectively) Federal Home Loan Bank Stock Federal Home Loan Bank stock Interest Receivable Accrued interest receivable Cash Surrender Value of Life Insurance Cash surrender value of life insurance Deferred tax assets (net of valuation allowance of $985 and $982, respectively) Deferred tax assets (net of valuation allowance of $1,713 and $1,202, respectively) Property, Plant and Equipment, Net Net Premises and equipment, net Real Estate Acquired Through Foreclosure Other real estate owned Goodwill Goodwill Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Other Assets Other assets Assets Total assets Liabilities and Equity [Abstract] Liabilities and Stockholders' Equity Liabilities [Abstract] Liabilities Deposits [Abstract] Deposits Noninterest-bearing Deposit Liabilities Noninterest bearing demand deposits Noninterest bearing Interest-bearing Deposit Liabilities Total interest bearing accounts Interest bearing Deposits Total deposits Advance Payments by Borrowers for Taxes and Insurance Mortgagors’ escrow accounts Advances from Federal Home Loan Banks Advances from the Federal Home Loan Bank Subordinated debt Subordinated debt Accrued Liabilities and Other Liabilities Accrued expenses and other liabilities Liabilities Total liabilities Stockholders' Equity Attributable to Parent [Abstract] Stockholders' Equity Preferred Stock, Value, Issued Preferred stock (par value $0.01 per share; 5,000,000 authorized, no shares issued) Common Stock, Value, Issued Common stock (par value $0.01 per share; 25,000,000 authorized, 11,133,290 issued and outstanding) Additional Paid in Capital, Common Stock Additional paid-in capital Unearned ESOP Shares Unearned common stock held by the employee stock ownership plan ("ESOP") Retained Earnings (Accumulated Deficit) Retained earnings Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated other comprehensive loss: Accumulated Other Comprehensive Income (Loss), Debt Securities, Available-for-sale, Adjustment, after Tax Net unrealized gain (loss) on available for sale securities, net of taxes Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Defined benefit pension plan, net of taxes Accumulated Other Comprehensive Income (Loss), Net of Tax Total accumulated other comprehensive loss Stockholders' Equity Attributable to Parent Balance Balance Total stockholders' equity Liabilities and Equity Total liabilities and stockholders' equity Loans and Leases Receivable, Allowance Allowance for loan losses Ending balance Beginning balance Allowance for loan losses on loans receivable Deferred Tax Assets, Valuation Allowance Deferred tax valuation allowance Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollars per share) Preferred Stock, Shares Authorized Preferred stock, share authorized Preferred Stock, Shares Issued Preferred Stock, shares issued Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common Stock, shares authorized Common Stock, Shares, Issued Common Stock, shares issued Common Stock, Shares, Outstanding Common stock, shares outstanding Income Statement [Abstract] Interest and Dividend Income, Operating [Abstract] Interest and Dividend Income Interest and Fee Income, Loans and Leases Interest and fees on loans Interest and Dividend Income, Securities, Operating Interest and dividends on securities Other Interest and Dividend Income Other income Interest and Dividend Income, Operating Total interest and dividend income Interest Expense [Abstract] Interest Expense Interest Expense, Deposits Interest expense on deposits Interest Expense, Borrowings Interest expense on borrowings Interest Expense Total interest expense Interest Income (Expense), Net Net interest income Provision for Loan and Lease Losses Provision for loan losses Provision for loan losses Interest Income (Expense), after Provision for Loan Loss Net interest income after provision for loan losses Noninterest Income [Abstract] Noninterest Income Revenue from Contract with Customer, Including Assessed Tax Service charges on deposit accounts Debt Securities, Realized Gain (Loss) Net realized loss on sales and calls of securities Gain (Loss) on Sales of Loans, Net Net gain on sales of loans Bank Owned Life Insurance Income Increase in cash surrender value of insurance Increase in cash surrender value of life insurance Gains (Losses) on Sales of Other Real Estate Net realized gain on sale of other real estate owned Net gain from sale of other real estate owned Profit (Loss) from Real Estate Operations Other real estate owned income Gain (Loss) on Disposition of Property Plant Equipment Gain on disposal of premises and equipment Gain on disposal of premises and equipment Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions Investment advisory income Noninterest Income, Other Operating Income Other Noninterest Income Total noninterest income Noninterest Expense [Abstract] Noninterest Expense Labor and Related Expense Salaries and employee benefits Occupancy, Net Occupancy Information Technology and Data Processing Data processing Professional Fees Professional fees Marketing Expense Marketing Federal Deposit Insurance Corporation Premium Expense FDIC deposit insurance and other insurance Foreclosed Real Estate Expense Other real estate owned expense Amortization of Intangible Assets Amortization Amortization of intangible assets Other Noninterest Expense Other Noninterest Expense Noninterest expense Total noninterest expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income before income taxes Income Tax Expense (Benefit) Provision for income taxes Net Income (Loss) Net income Net Income Net income Net income applicable to common stock Earnings Per Share Earnings per common share: Earnings Per Share, Basic Basic (in dollars per share) Earnings Per Share, Diluted Diluted (in dollars per share) Weighted Average Number of Shares Outstanding, Basic Weighted average shares outstanding, basic Weighted Average Number of Shares Outstanding, Diluted Weighted average shares outstanding, diluted Statement of Comprehensive Income [Abstract] Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Other Comprehensive Income: Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax Unrealized holding (losses) gains arising during the period Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Reclassification adjustment for losses included in net realized loss on sales and calls of securities on the consolidated statements of income Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax Net unrealized (losses) gains on available for sale securities Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax Tax effect Available-for-sale Securities, gross realized losses Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Unrealized (losses) gains on available for sale securities, net of tax Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax [Abstract] Defined benefit pension plan: Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Actuarial gains (losses) arising during the period Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Reclassification adjustment for amortization of net actuarial losses Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Total Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Tax effect Amortization of net actuarial loss Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Defined benefit pension plan gains (losses), net of tax Other Comprehensive Income (Loss), Net of Tax Other comprehensive income (loss) Other comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Total Comprehensive Income Statement [Table] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Represents as income tax expense. Income Tax Expense [Member] Related income tax expense Statement [Line Items] Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock Additional Paid In Capital [Member] Additional Paid-in Capital This member stands for unallocated common stock held by ESOP. Unallocated Common Stock Held By Esop [Member] Unearned common stock held by the ESOP Retained Earnings [Member] Retained Earnings Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Loss Increase (Decrease) in Stockholders' Equity [Roll Forward] Stock Issued During Period, Value, New Issues Common Stock and proceeds of offering Unearned common stock held by ESOP. Unearned Common Stock Held By ESOP Unearned common stock held by ESOP Esop Shares Committed To Be Allocated , Value ESOP shares committed to be allocated APIC, Share-based Payment Arrangement, Increase for Cost Recognition Share-based compensation expense Statement of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Cash Flows from Operating Activities Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Accretion (Amortization) of Discounts and Premiums, Investments Amortization and accretion of premiums and discounts on investments, net Net Realized and Unrealized Gain (Loss) on Trading Securities Net realized loss on sales and calls of securities Increase (Decrease) in Loans Held-for-sale Loans originated for sale Proceeds from Sale of Loans Held-for-sale Proceeds from sale of loans Gain (Loss) on Sale of Mortgage Loans Net gain on sale of loans Other Depreciation and Amortization Depreciation and amortization Deferred Income Tax Expense (Benefit) Deferred income tax benefit Increase (Decrease) in Accrued Interest Receivable, Net Increase in accrued interest receivable Employee Stock Ownership Plan (ESOP), Compensation Expense Expense of earned ESOP shares Compensation expense Share-based Payment Arrangement, Noncash Expense Share-based compensation expense Increase (Decrease) in Other Operating Assets (Increase) decrease in other assets Increase (Decrease) in Other Accrued Liabilities Increase in accrued expenses and other liabilities Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash Flows from Investing Activities Proceeds from Sale and Maturity of Debt Securities, Available-for-sale, Total Proceeds from sales and calls of securities Proceeds from Sale and Maturity of Marketable Securities Proceeds from maturities and principal repayments of securities Payments to Acquire Investments, Total Purchases of securities Payments for (Proceeds from) Federal Home Loan Bank Stock, Total Net sales (purchases) of FHLB Stock Payments to Acquire Loans Held-for-investment Net increase in loans Payment to Acquire Life Insurance Policy, Investing Activities Purchases of bank owned life insurance Payments to Acquire Property, Plant, and Equipment, Total Purchases of bank premises and equipment The increase (decrease) during the reporting period in other real estate owned. Increase Decrease In Other Real Estate Owned Net increase of other real estate owned Proceeds from Sale of Other Real Estate Proceeds from sale of other real estate owned Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash Flows from Financing Activities Net cash inflow (outflow) of demand deposits, money market and savings accounts Increase (Decrease) In Demand Deposits, Money Market And Savings Accounts Net increase in demand deposits, NOW, money market and savings accounts Increase (Decrease) in Time Deposits Net (decrease) increase in time deposits Increase (Decrease) in Advance Payments by Borrowers for Taxes and Insurance Decrease in mortgagors' escrow accounts Proceeds from Short-term Debt Funding received Net decrease in short-term debt Proceeds from (Repayments of) Long-term Debt and Capital Securities Net (decrease) increase in long-term debt Proceeds from Issuance Initial Public Offering Proceeds of stock subscriptions Represents amount of Return of unfulfilled subscriptions. Return Of Unfulfilled Subscriptions Return of unfulfilled stock subscriptions Origination of Loans to Employee Stock Ownership Plans Loan to ESOP Payments of Stock Issuance Costs Offering expenses Payments of Capital Distribution Return of capital to Rhinebeck Bancorp, MHC Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Net increase (decrease) in cash and due from banks Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect [Abstract] Cash and Due from Banks Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Ending balance Beginning balance Supplemental Cash Flow Information [Abstract] Supplemental Disclosures of Cash Flow Information Cash Paid For [Abstract] Cash paid for: Interest Paid, Excluding Capitalized Interest, Operating Activities Interest Income Taxes Paid, Net Income taxes Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Noncash Investing and Financing Activities Real Estate Owned, Transfer to Real Estate Owned Transfer of loans to other real estate owned Nature of Business and Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Nature of Business and Significant Accounting Policies Investment Securities