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Investment Securities, Held-to-maturity Securities, Maturity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Investment Securities [Abstract]          
Sales and transfers of held to maturity securities $ 0 $ 0 $ 0 $ 0  
Amortized Cost [Abstract]          
Amortized Cost 29,268   29,268   $ 45,490
Fair Value [Abstract]          
Fair Value 30,731   30,731   47,526
Mortgage-Backed Securities and Collateralized Mortgage Obligations-Residential [Member]          
Amortized Cost [Abstract]          
Securities, amortized cost 29,268   29,268    
Amortized Cost 29,268   29,268   35,500
Fair Value [Abstract]          
Securities, fair value 30,731   30,731    
Fair Value $ 30,731   $ 30,731   $ 37,236