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Investment Securities - Continuous Unrealized Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]          
Fair value, less than 12 months $ 107,877   $ 107,877   $ 69,405
Unrealized loss, less than 12 months (542)   (542)   (476)
Fair value, 12 months or more 74,804   74,804   69,367
Unrealized loss, 12 months or more (1,455)   (1,455)   (723)
Total fair value 182,681   182,681   138,772
Total unrealized loss (1,997)   (1,997)   (1,199)
Other than temporary impairment losses 0 $ 0 0 $ 0  
Agency bond securities          
Schedule of Available-for-sale Securities [Line Items]          
Fair value, less than 12 months 19,584   19,584    
Unrealized loss, less than 12 months (128)   (128)    
Fair value, 12 months or more 0   0    
Unrealized loss, 12 months or more 0   0    
Total fair value 19,584   19,584    
Total unrealized loss (128)   (128)    
Agency mortgage-backed securities          
Schedule of Available-for-sale Securities [Line Items]          
Fair value, less than 12 months 32,282   32,282   62,683
Unrealized loss, less than 12 months (328)   (328)   (453)
Fair value, 12 months or more 65,414   65,414   44,159
Unrealized loss, 12 months or more (1,402)   (1,402)   (602)
Total fair value 97,696   97,696   106,842
Total unrealized loss (1,730)   (1,730)   (1,055)
Municipal bonds          
Schedule of Available-for-sale Securities [Line Items]          
Fair value, less than 12 months 346   346   0
Unrealized loss, less than 12 months (21)   (21)   0
Fair value, 12 months or more 131   131   193
Unrealized loss, 12 months or more (9)   (9)   (7)
Total fair value 477   477   193
Total unrealized loss (30)   (30)   (7)
Asset-backed securities          
Schedule of Available-for-sale Securities [Line Items]          
Fair value, less than 12 months 55,665   55,665   2,134
Unrealized loss, less than 12 months (65)   (65)   (2)
Fair value, 12 months or more 9,259   9,259   18,727
Unrealized loss, 12 months or more (44)   (44)   (89)
Total fair value 64,924   64,924   20,861
Total unrealized loss $ (109)   $ (109)   (91)
U.S. Treasury notes          
Schedule of Available-for-sale Securities [Line Items]          
Fair value, less than 12 months         4,588
Unrealized loss, less than 12 months         (21)
Fair value, 12 months or more         6,288
Unrealized loss, 12 months or more         (25)
Total fair value         10,876
Total unrealized loss         $ (46)