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Long-Term Borrowings and Subordinated Debt - Key Terms of Junior Subordinated Debt Securities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Junior Subordinated Debentures [Line Items]      
Junior subordinated debt securities $ 45,619 $ 45,619 $ 45,619
December 31, 2017 1.88% 2.91% 0.81%
2006 Junior Subordinated Debt      
Junior Subordinated Debentures [Line Items]      
Junior subordinated debt securities $ 25,000 $ 25,000 $ 25,000
Stated Maturity Date Dec. 15, 2036    
Optional redemption date at par Any time after 9/15/2011    
Regulatory Capital Tier 2    
December 31, 2017 2.92%    
2006 Junior Subordinated Debt | 3-Month LIBOR      
Junior Subordinated Debentures [Line Items]      
Basis spread over variable rate 160.00%    
2008 Trust Preferred Securities      
Junior Subordinated Debentures [Line Items]      
Junior subordinated debt securities $ 20,619 $ 20,619 $ 20,619
Stated Maturity Date Mar. 15, 2038    
Optional redemption date at par Any time after 3/15/2013    
Regulatory Capital Tier 1    
December 31, 2017 4.82%    
2008 Trust Preferred Securities | 3-Month LIBOR      
Junior Subordinated Debentures [Line Items]      
Basis spread over variable rate 350.00%