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Securities (Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Amortized Cost    
Due within one year $ 0  
Due after one year but within five years 43,711  
Due after five years but within ten years 5,000  
Due after ten years 5,000  
Mortgage-backed securities 758,491  
Amortized Cost 812,202 $ 513,741
Securities available for sale:    
Due within one year 0  
Due after one year but within five years 44,616  
Due after five years but within ten years 4,992  
Due after ten years 5,052  
Mortgage-backed securities 767,285  
Total securities 821,945 501,351
Amortized Cost    
Due within one year 1,165  
Due after one year but within five years 17,909  
Due after five years but within ten years 6,923  
Due after ten years 512  
Mortgage-backed securities 41,423  
Amortized Cost 67,932 101,237
Fair Value    
Due within one year 1,167  
Due after one year but within five years 18,123  
Due after five years but within ten years 6,984  
Due after ten years 517  
Mortgage-backed securities 41,542  
Total securities $ 68,333 $ 99,906