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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
FDIC indemnification asset expense $ 5,700    
Other investments $ 3,100 $ 2,300  
Minimum [Member]      
Useful life 2 years    
Maximum [Member]      
Useful life 40 years    
Employee Stock Option [Member]      
Number of anti-dilutive securities 5,000 50,000 93,000
Stock options - Improbability of Vesting [Member]      
Number of anti-dilutive securities     75,000