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Long-Term Borrowings - Schedules of long-term Borrowings (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020	Feb. 26, 2020	Jul. 26, 2016	Aug. 05, 2014
Long-Term Borrowings
Less: unamortized debt issuance costs	$ (361,000)	$ (1,923,000)
Long-term borrowings	69,639,000	268,077,000
Subordinated Notes, 5.75%
Long-Term Borrowings
Long-term borrowings, gross	$ 70,000,000	70,000,000
Interest rate (as a percent)	5.75%				5.75%
Subordinated Notes, 5.0%
Long-Term Borrowings
Long-term borrowings, gross	$ 0	150,000,000
Interest rate (as a percent)	5.00%			5.00%
FHLB Advance, 1.81%
Long-Term Borrowings
Long-term borrowings, gross	$ 0	$ 50,000,000	$ 50,000,000
Interest rate (as a percent)	1.81%		1.81%