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Investment Securities, Held-to-maturity Securities, Maturity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Investment Securities [Abstract]    
Sales and transfers of held to maturity securities $ 0 $ 0
Amortized Cost [Abstract]    
Amortized Cost 27,551 45,490
Fair Value [Abstract]    
Fair Value 28,701 47,526
Mortgage-Backed Securities and Collateralized Mortgage Obligations-Residential [Member]    
Amortized Cost [Abstract]    
Securities, amortized cost 27,551  
Amortized Cost 27,551 35,500
Fair Value [Abstract]    
Securities, fair value 28,701  
Fair Value $ 28,701 $ 37,236