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Investment Securities - Gross Unrealized Losses and Fair Value Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Investment Securities    
Less than 12 months Fair Value $ 20,188 $ 62,294
Less than 12 months Unrealized Loss (198) (1,155)
12 months or more Fair Value 40,641 10,589
12 months or more Unrealized Loss (1,084) (293)
Total Fair Value 60,829 72,883
Total Unrealized Loss (1,282) (1,448)
Collaterized mortgage obligations    
Investment Securities    
Less than 12 months Fair Value 6,531 18,244
Less than 12 months Unrealized Loss (63) (174)
12 months or more Fair Value 15,678 8,775
12 months or more Unrealized Loss (507) (248)
Total Fair Value 22,209 27,019
Total Unrealized Loss (570) (422)
Agency mortgage-backed securities    
Investment Securities    
Less than 12 months Fair Value 6,802 24,850
Less than 12 months Unrealized Loss (80) (401)
12 months or more Fair Value 18,218 828
12 months or more Unrealized Loss (420) (28)
Total Fair Value 25,020 25,678
Total Unrealized Loss (500) (429)
Municipal securities    
Investment Securities    
Less than 12 months Fair Value 2,396 19,200
Less than 12 months Unrealized Loss (11) (580)
12 months or more Fair Value 6,230  
12 months or more Unrealized Loss (148)  
Total Fair Value 8,626 19,200
Total Unrealized Loss (159) (580)
U.S. Government agency securities    
Investment Securities    
Less than 12 months Fair Value 2,965  
Less than 12 months Unrealized Loss (37)  
12 months or more Fair Value 515 986
12 months or more Unrealized Loss (9) (17)
Total Fair Value 3,480 986
Total Unrealized Loss (46) $ (17)
U.S. Treasury securities    
Investment Securities    
Less than 12 months Fair Value 1,494  
Less than 12 months Unrealized Loss (7)  
Total Fair Value 1,494  
Total Unrealized Loss $ (7)