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Securities Available for Sale - Schedule of Securities with Gross Unrealized Losses, by Investment Category (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Securities in an Unrealized Loss Position Over 12 Months, Gross unrealized Losses $ (388) $ (343)
Securities in an Unrealized Loss Position Over 12 Months, Fair Value 8,633 9,005
Securities in an Unrealized Loss Position Less than 12 Month, Gross unrealized Losses (10) (1)
Securities in an Unrealized Loss Position Less than 12 Month, Fair Value 2,357 540
Collateralized Mortgage Obligations [Member]    
Securities in an Unrealized Loss Position Over 12 Months, Gross unrealized Losses (386) (340)
Securities in an Unrealized Loss Position Over 12 Months, Fair Value 8,121 8,466
Securities in an Unrealized Loss Position Less than 12 Month, Gross unrealized Losses
Securities in an Unrealized Loss Position Less than 12 Month, Fair Value
SBA Pools Securities [Member]    
Securities in an Unrealized Loss Position Over 12 Months, Gross unrealized Losses (2) (3)
Securities in an Unrealized Loss Position Over 12 Months, Fair Value 512 539
Securities in an Unrealized Loss Position Less than 12 Month, Gross unrealized Losses (10) (1)
Securities in an Unrealized Loss Position Less than 12 Month, Fair Value $ 2,357 $ 540