Borrowed Funds - Subordinated Debt (Details) - USD ($)	1 Months Ended	6 Months Ended	12 Months Ended
	Nov. 30, 2020	Jun. 30, 2021	Dec. 31, 2020	Mar. 31, 2007
Subordinated Debt
Balance at end of period		$ 43,480,000	$ 43,407,000
Subordinated Debt
Subordinated Debt
Balance at end of period		43,480,000	43,407,000
Average balance during the period		43,444,000	7,568,000
Maximum month-end balance		$ 43,480,000	$ 43,524,000
Weighted-average rate during the period		4.44%	3.45%
Weighted-average rate at end of period		4.01%	4.02%
Face amount of debt issued	$ 40,000,000
Term of debt instrument	10 years
Interest rate on debt security	4.25%
Subordinated Debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Subordinated Debt
Variable rate basis spread	4.01%
Subordinated Debt | Subordinated Debentures
Subordinated Debt
Face amount of debt issued				$ 4,000,000
Subordinated Debt | Subordinated Debentures | LIBOR
Subordinated Debt
Variable rate basis spread		1.60%