Long-Term Borrowings and Subordinated Debt - Junior Subordinated Debt Securities and Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Junior Subordinated Debentures [Line Items]
Balance	$ 45,619	$ 45,619	$ 45,619
Interest Expense	2,100	1,663	1,434
2006 Junior Subordinated Debt
Junior Subordinated Debentures [Line Items]
Balance	25,000	25,000	25,000
Interest Expense	951	708	580
2008 Junior subordinated debt—trust preferred securities
Junior Subordinated Debentures [Line Items]
Balance	20,619	20,619	20,619
Interest Expense	$ 1,149	$ 955	$ 854