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Long-Term Borrowings and Subordinated Debt - Junior Subordinated Debt Securities and Interest Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Junior Subordinated Debentures [Line Items]      
Balance $ 45,619 $ 45,619 $ 45,619
Interest Expense 1,663 1,434 1,327
2006 Junior Subordinated Debt      
Junior Subordinated Debentures [Line Items]      
Balance 25,000 25,000 25,000
Interest Expense 708 580 554
2008 Junior subordinated debt—trust preferred securities      
Junior Subordinated Debentures [Line Items]      
Balance 20,619 20,619 20,619
Interest Expense $ 955 $ 854 $ 773