Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Cash Flows from Operating Activities
Net income			$ 3,573	$ 4,223
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and accretion of premiums and discounts on investments, net			542	169
Net realized loss on sales and calls of securities			29	40
Net realized gain on sale of other real estate owned	$ (42)		(42)
Provision for loan losses	2,250	$ 450	5,705	2,010
Loans originated for sale			(65,974)	(30,455)
Proceeds from sale of loans			68,745	30,985
Net gain on sale of loans			(2,382)	(706)
Amortization of intangible assets	11	10	32	32	$ 43
Depreciation and amortization			1,014	969
Gain on disposal of premises and equipment	(13)		(13)
Deferred income tax benefit			(1,474)	(224)
Increase in cash surrender value of insurance	(97)	(100)	(290)	(300)
Increase in accrued interest receivable			(994)	(270)
Expense of earned ESOP shares			129
Share-based compensation expense			61
(Increase) decrease in other assets			(8,315)	1,213
Increase in accrued expenses and other liabilities			5,914	1,256
Net cash provided by operating activities			6,260	8,942
Cash Flows from Investing Activities
Proceeds from sales and calls of securities			6,997	5,554
Proceeds from maturities and principal repayments of securities			28,142	11,952
Purchases of securities			(25,210)	(28,388)
Net sales (purchases) of FHLB Stock			460	(725)
Net increase in loans			(104,977)	(82,430)
Purchases of bank owned life insurance			(41)	(41)
Purchases of bank premises and equipment			(1,548)	(2,500)
Net increase of other real estate owned			(31)
Proceeds from sale of other real estate owned			2,221	180
Net cash used in investing activities			(93,987)	(96,398)
Cash Flows from Financing Activities
Net increase in demand deposits, NOW, money market and savings accounts			151,023	31,429
Net (decrease) increase in time deposits			(8,171)	54,138
Decrease in mortgagors' escrow accounts			(4,075)	(4,032)
Net decrease in short-term debt			(2,223)	(13,954)
Net (decrease) increase in long-term debt			(9,224)	25,292
Proceeds of stock subscriptions				9,814
Return of unfulfilled stock subscriptions				(41,082)
Loan to ESOP				(4,364)
Offering expenses				(1,898)
Return of capital to Rhinebeck Bancorp, MHC				(121)
Net cash provided by financing activities			127,330	55,222
Net increase (decrease) in cash and due from banks			39,603	(32,234)
Cash and Due from Banks
Beginning balance			11,978	50,590	50,590
Ending balance	$ 51,581	$ 18,356	51,581	18,356	$ 11,978
Cash paid for:
Interest			6,650	6,243
Income taxes			2,897	$ 1,040
Noncash Investing and Financing Activities
Transfer of loans to other real estate owned			$ 1,858