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Recent Accounting Developments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Unrealized gain from securities $ (581) $ 0 $ 456 $ 0    
Change in interest income hedge effectiveness     (55)      
Provisional tax benefit recognized         $ 7,600  
Additional net tax benefit     $ 1,200      
ASU 2016-01            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect adjustment           $ (1,880)
ASU 2017-12            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect adjustment           (116)
ASU 2018-02            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect adjustment           (2,974)
Retained earnings | ASU 2016-01            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect adjustment           1,880
Retained earnings | ASU 2017-12            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect adjustment           (116)
Retained earnings | ASU 2018-02            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect adjustment           2,974
Accumulated other comprehensive loss | ASU 2016-01            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect adjustment           (1,880)
Accumulated other comprehensive loss | ASU 2018-02            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect adjustment           (2,974)
New Accounting Pronouncement, Early Adoption, Effect | Retained earnings | ASU 2018-02            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect adjustment           3,000
New Accounting Pronouncement, Early Adoption, Effect | Accumulated other comprehensive loss | ASU 2018-02            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect adjustment           $ (3,000)