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Securities (Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Securities Available for Sale - Amortized Cost    
Due within one year  
Due after one year but within five years 15,007  
Due after five years but within ten years 27,785  
Due after ten years 5,000  
Mortgage-backed securities 297,690  
Total debt securities 345,482  
Equity securities  
Total securities 345,482 $ 202,414
Securities Available for Sale - Fair Value    
Due within one year  
Due after one year but within five years 14,905  
Due after five years but within ten years 28,042  
Due after ten years 5,110  
Mortgage-backed securities 295,213  
Total debt securities 343,270  
Equity securities  
Total securities 343,270 199,329
Securities Held to Maturity - Amortized Cost    
Due within one year 2,257  
Due after one year but within five years 23,285  
Due after five years but within ten years 23,502  
Due after ten years 5,630  
Mortgage-backed securities 63,829  
Total debt securities 118,503 129,713
Equity securities  
Total securities 118,503  
Securities Held to Maturity - Fair Value    
Due within one year 2,258  
Due after one year but within five years 23,795  
Due after five years but within ten years 24,219  
Due after ten years 5,634  
Mortgage-backed securities 63,092  
Total debt securities 118,998  
Equity securities  
Securities held to maturity $ 118,998 $ 130,195