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Securities (Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Securities Available for Sale - Amortized Cost      
Due within one year    
Due after one year but within five years 40,235    
Due after five years but within ten years 7,547    
Due after ten years 5,000    
Mortgage-backed securities 297,720    
Total debt securities 350,502    
Securities Available for Sale - Fair Value      
Due within one year    
Due after one year but within five years 39,547    
Due after five years but within ten years 7,480    
Due after ten years 5,050    
Mortgage-backed securities 288,924    
Total debt securities 341,001    
Securities Held to Maturity - Amortized Cost      
Due within one year 3,007    
Due after one year but within five years 22,812    
Due after five years but within ten years 20,775    
Due after ten years 4,680    
Mortgage-backed securities 60,784    
Total debt securities 112,058 $ 118,503 $ 133,254
Securities Held to Maturity - Fair Value      
Due within one year 3,041    
Due after one year but within five years 23,222    
Due after five years but within ten years 21,271    
Due after ten years 4,650    
Mortgage-backed securities 59,017    
Securities held to maturity $ 111,201 $ 118,998 $ 134,185