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Securities (Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Securities Available for Sale - Amortized Cost    
Due within one year  
Due after one year but within five years 109,205  
Due after five years but within ten years 2,541  
Due after ten years 5,000  
Mortgage-backed securities 396,995  
Total securities 513,741 $ 345,482
Securities Available for Sale - Fair Value    
Due within one year  
Due after one year but within five years 108,303  
Due after five years but within ten years 2,559  
Due after ten years 4,938  
Mortgage-backed securities 385,551  
Securities available for sale 501,351 343,270
Securities Held to Maturity - Amortized Cost    
Due within one year 2,233  
Due after one year but within five years 28,488  
Due after five years but within ten years 16,743  
Due after ten years 1,725  
Mortgage-backed securities 52,048  
Total securities 101,237  
Securities Held to Maturity - Fair Value    
Due within one year 2,240  
Due after one year but within five years 28,766  
Due after five years but within ten years 16,932  
Due after ten years 1,727  
Mortgage-backed securities 50,241  
Total securities $ 99,906 $ 118,998