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Investment Securities Continuous Unrealized Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]          
Fair value, less than 12 months $ 96,881   $ 96,881   $ 69,405
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (439)   (439)   (476)
Fair value, 12 months or more 54,630   54,630   69,367
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1,225)   (1,225)   (723)
Total fair value 151,511   151,511   138,772
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments (1,664)   (1,664)   (1,199)
Other than temporary impairment losses 0 $ 0 0 $ 0  
Agency bond securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair value, less than 12 months 14,904   14,904    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (48)   (48)    
Fair value, 12 months or more 0   0    
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0   0    
Total fair value 14,904   14,904    
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments (48)   (48)    
Mortgage-backed securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair value, less than 12 months 52,114   52,114   62,683
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (366)   (366)   (453)
Fair value, 12 months or more 45,236   45,236   44,159
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1,148)   (1,148)   (602)
Total fair value 97,350   97,350   106,842
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments (1,514)   (1,514)   (1,055)
Municipal bonds [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair value, less than 12 months 427   427   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (12)   (12)   0
Fair value, 12 months or more 156   156   193
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (9)   (9)   (7)
Total fair value 583   583   193
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments (21)   (21)   (7)
Asset-backed securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair value, less than 12 months 29,436   29,436   2,134
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (13)   (13)   (2)
Fair value, 12 months or more 9,238   9,238   18,727
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (68)   (68)   (89)
Total fair value 38,674   38,674   20,861
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments $ (81)   $ (81)   (91)
US treasury notes [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair value, less than 12 months         4,588
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss         (21)
Fair value, 12 months or more         6,288
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss         (25)
Total fair value         10,876
Available-for-sale securities, continuous unrealized loss position,aggregate loss, accumulated in investments         $ (46)