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Securities (Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Securities Available for Sale - Amortized Cost      
Due within one year    
Due after one year but within five years 105,196    
Due after five years but within ten years 2,540    
Due after ten years 5,000    
Mortgage-backed securities 533,360    
Total debt securities 646,096    
Securities Available for Sale - Fair Value      
Due within one year    
Due after one year but within five years 105,195    
Due after five years but within ten years 2,480    
Due after ten years 4,986    
Mortgage-backed securities 526,948    
Total debt securities 639,609    
Securities Held to Maturity - Amortized Cost      
Due within one year 865    
Due after one year but within five years 26,571    
Due after five years but within ten years 12,427    
Due after ten years 1,679    
Mortgage-backed securities 49,361    
Total debt securities 90,903 $ 101,237 $ 112,058
Securities Held to Maturity - Fair Value      
Due within one year 868    
Due after one year but within five years 26,860    
Due after five years but within ten years 12,559    
Due after ten years 1,702    
Mortgage-backed securities 48,291    
Securities held to maturity $ 90,280 $ 99,906 $ 111,201