Long-Term Borrowings and Subordinated Debt - Interest Expense and Weighted Average Interest Rates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Long-term borrowings	$ 23,681	$ 50,868	$ 70,314
Weighted average interest rate	2.03%	2.60%	2.84%
Interest expense	$ 1,201	$ 1,831	$ 1,129