Long-Term Borrowings and Subordinated Debt - Junior Subordinated Debt Securities and Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Junior Subordinated Debentures [Line Items]
Balance	$ 64,083	$ 64,277	$ 45,619
Interest Expense	2,286	2,310	2,100
Junior Subordinated Debt
Junior Subordinated Debentures [Line Items]
Balance	34,750	34,753	25,000
Interest Expense	1,007	1,059	951
Junior subordinated debt—trust preferred securities
Junior Subordinated Debentures [Line Items]
Balance	29,333	29,524	20,619
Interest Expense	$ 1,279	$ 1,251	$ 1,149