Quarterly report pursuant to Section 13 or 15(d)

Investment Securities - Schedule of Fair Values of Securities Available for Sale (Details)

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Investment Securities - Schedule of Fair Values of Securities Available for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]    
Securities available for sale, Amortized Cost $ 37,082 $ 37,877
Securities available for sale, Unrealized Losses 1,280 634
Available for sale securities, at fair value 35,802 37,243
U.S. Government Agencies    
Schedule Of Available For Sale Securities [Line Items]    
Securities available for sale, Amortized Cost 2,011 2,010
Securities available for sale, Unrealized Losses 104 61
Available for sale securities, at fair value 1,907 1,949
Residential Mortgage-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Securities available for sale, Amortized Cost 29,371 30,156
Securities available for sale, Unrealized Losses 1,005 527
Available for sale securities, at fair value 28,366 29,629
Corporate Bonds and Other Debt Securities    
Schedule Of Available For Sale Securities [Line Items]    
Securities available for sale, Amortized Cost 5,700 5,711
Securities available for sale, Unrealized Losses 171 46
Available for sale securities, at fair value $ 5,529 $ 5,665