Quarterly report pursuant to Section 13 or 15(d)

Investment Securities - Schedule of Investment Securities Available for Sale and Aggregated by Investment Category and Length of Time Individual Securities in Continuous Unrealized Loss Position (Details)

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Investment Securities - Schedule of Investment Securities Available for Sale and Aggregated by Investment Category and Length of Time Individual Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]    
Investment Securities, Available for sale, Fair Value, Less than 12 Months $ 31,835 $ 37,241
Investment Securities, Available for sale, Unrealized Loss, Less than 12 Months 1,140 634
Investment Securities, Available for sale, Fair Value, 12 Months or More 3,967  
Investment Securities, Available for sale, Unrealized Loss, 12 Months or More 140  
Investment Securities, Available for sale, Fair Value 35,802 37,241
Investment Securities, Available for sale, Unrealized Loss 1,280 634
U.S. Government Agencies    
Schedule Of Available For Sale Securities [Line Items]    
Investment Securities, Available for sale, Fair Value, Less than 12 Months 1,907 1,949
Investment Securities, Available for sale, Unrealized Loss, Less than 12 Months 104 61
Investment Securities, Available for sale, Fair Value 1,907 1,949
Investment Securities, Available for sale, Unrealized Loss 104 61
Residential Mortgage-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Investment Securities, Available for sale, Fair Value, Less than 12 Months 24,399 29,627
Investment Securities, Available for sale, Unrealized Loss, Less than 12 Months 865 527
Investment Securities, Available for sale, Fair Value, 12 Months or More 3,967  
Investment Securities, Available for sale, Unrealized Loss, 12 Months or More 140  
Investment Securities, Available for sale, Fair Value 28,366 29,627
Investment Securities, Available for sale, Unrealized Loss 1,005 527
Corporate Bonds and Other Debt Securities    
Schedule Of Available For Sale Securities [Line Items]    
Investment Securities, Available for sale, Fair Value, Less than 12 Months 5,529 5,665
Investment Securities, Available for sale, Unrealized Loss, Less than 12 Months 171 46
Investment Securities, Available for sale, Fair Value 5,529 5,665
Investment Securities, Available for sale, Unrealized Loss $ 171 $ 46