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Securities (Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Securities Available for Sale - Amortized Cost      
Due within one year    
Due after one year but within five years 70,218    
Due after five years but within ten years 2,543    
Due after ten years 5,000    
Mortgage-backed securities 287,746    
Total debt securities 365,507    
Securities Available for Sale - Fair Value      
Due within one year    
Due after one year but within five years 69,160    
Due after five years but within ten years 2,523    
Due after ten years 4,911    
Mortgage-backed securities 276,474    
Total debt securities 353,068    
Securities Held to Maturity - Amortized Cost      
Due within one year 3,240    
Due after one year but within five years 28,532    
Due after five years but within ten years 16,790    
Due after ten years 1,745    
Mortgage-backed securities 54,512    
Total debt securities 104,819 $ 118,503 $ 123,156
Securities Held to Maturity - Fair Value      
Due within one year 3,254    
Due after one year but within five years 28,838    
Due after five years but within ten years 16,978    
Due after ten years 1,730    
Mortgage-backed securities 52,560    
Securities held to maturity $ 103,360 $ 118,998 $ 124,878