Available for Sale Securities (Schedule of gross unrealized losses and fair value, securities in continuous unrealized loss position) (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Less Than 12 Months Fair Value	$ 24,342	$ 54,534
Less Than 12 Months Unrealized Losses	(264)	(1,096)
12 Months or Longer Fair Value	91,110	90,520
12 Months or Longer Unrealized Losses	(7,928)	(12,175)
Fair Value	115,452	145,054
Unrealized Losses	(8,192)	(13,271)
U.S. Treasury securities
Debt Securities, Available-for-Sale [Line Items]
Less Than 12 Months Fair Value	12,909	9,957
Less Than 12 Months Unrealized Losses	(11)	(22)
12 Months or Longer Fair Value		4,866
12 Months or Longer Unrealized Losses		(132)
Fair Value	12,909	14,823
Unrealized Losses	(11)	(154)
U.S. government agency mortgage-backed securities-residential
Debt Securities, Available-for-Sale [Line Items]
Less Than 12 Months Fair Value	9,846	44,577
Less Than 12 Months Unrealized Losses	(24)	(1,074)
12 Months or Longer Fair Value	64,740	48,915
12 Months or Longer Unrealized Losses	(6,863)	(9,382)
Fair Value	74,586	93,492
Unrealized Losses	(6,887)	(10,456)
U.S. government agency securities
Debt Securities, Available-for-Sale [Line Items]
12 Months or Longer Fair Value	11,803	21,166
12 Months or Longer Unrealized Losses	(198)	(844)
Fair Value	11,803	21,166
Unrealized Losses	(198)	(844)
Municipal securities
Debt Securities, Available-for-Sale [Line Items]
12 Months or Longer Fair Value	1,997	2,493
12 Months or Longer Unrealized Losses	(123)	(224)
Fair Value	1,997	2,493
Unrealized Losses	(123)	(224)
Corporate bonds
Debt Securities, Available-for-Sale [Line Items]
Less Than 12 Months Fair Value	1,235
Less Than 12 Months Unrealized Losses	(14)
12 Months or Longer Fair Value	12,570	12,583
12 Months or Longer Unrealized Losses	(744)	(1,471)
Fair Value	13,805	12,583
Unrealized Losses	(758)	(1,471)
Other
Debt Securities, Available-for-Sale [Line Items]
Less Than 12 Months Fair Value	352
Less Than 12 Months Unrealized Losses	(215)
12 Months or Longer Fair Value		497
12 Months or Longer Unrealized Losses		(122)
Fair Value	352	497
Unrealized Losses	$ (215)	$ (122)

Rhinebeck Bancorp, Inc. 10-K