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Securities (Schedule of Book Values and Fair Values of Investment Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Securities Available for Sale - Amortized Cost      
Due within one year    
Due after one year but within five years $ 10,639    
Due after five years but within ten years 56,862    
Due after ten years 5,000    
Mortgage-backed securities 174,905    
Total debt securities 247,406    
Equity securities 83    
Total securities $ 247,489 $ 166,778  
Securities Available for Sale - Fair Value      
Due within one year    
Due after one year but within five years $ 10,635    
Due after five years but within ten years 56,919    
Due after ten years 4,880    
Mortgage-backed securities 174,579    
Total debt securities 247,013    
Equity securities 127    
Total securities 247,140 165,614 $ 172,319
Securities Held to Maturity - Amortized Cost      
Due within one year 1,308    
Due after one year but within five years 12,630    
Due after five years but within ten years 35,268    
Due after ten years 1,177    
Mortgage-backed securities 98,102    
Total debt securities 148,485 154,610 170,804
Total securities 148,485    
Securities Held to Maturity - Fair Value      
Due within one year 1,340    
Due after one year but within five years 13,253    
Due after five years but within ten years 37,882    
Due after ten years 1,179    
Mortgage-backed securities 98,030    
Total debt securities 151,684    
Securities held to maturity $ 151,684 $ 157,146 $ 174,756