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Long-Term Borrowings - Schedules of long-term Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Feb. 26, 2020	Dec. 31, 2019
Long-Term Borrowings
Less: unamortized debt issuance costs	$ (2,020)		$ (2,313)
Long-term borrowings	267,980		217,687
Subordinated Notes, 5.75%
Long-Term Borrowings
Long-term borrowings, gross	$ 70,000		70,000
Interest rate (as a percent)	5.00%
Subordinated Notes, 5.0%
Long-Term Borrowings
Long-term borrowings, gross	$ 150,000		150,000
Interest rate (as a percent)	5.75%
FHLB Advance, 1.81%
Long-Term Borrowings
Long-term borrowings, gross	$ 50,000	$ 50,000	$ 0
Interest rate (as a percent)		1.81%