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Investment Securities - Gross Gains and Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 225,829 $ 154,652
Gross unrealized gains 45 56
Gross unrealized losses (1,997) (1,199)
Fair value 223,877 153,509
Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost   1,000
Gross unrealized gains   0
Gross unrealized losses   0
Fair value   1,000
U.S. Treasury notes    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost   10,921
Gross unrealized gains   0
Gross unrealized losses   (46)
Fair value   10,875
Negotiable certificate of deposit    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 15,000  
Gross unrealized gains 0  
Gross unrealized losses 0  
Fair value 15,000  
Agency bond securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 19,712  
Gross unrealized gains 0  
Gross unrealized losses (128)  
Fair value 19,584  
Agency mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 114,158 121,037
Gross unrealized gains 43 52
Gross unrealized losses (1,730) (1,055)
Fair value 112,471 120,034
Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 507 742
Gross unrealized gains 0 4
Gross unrealized losses (30) (7)
Fair value 477 739
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 76,452 20,952
Gross unrealized gains 2 0
Gross unrealized losses (109) (91)
Fair value $ 76,345 $ 20,861