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Investment Securities - Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Amortized cost
Due in one year or less	$ 15,000
Due after one year through five years	10,000
Due after five years through ten years	0
Due after ten years	352
Mortgage and asset-backed securities	217,002
Amortized cost	242,354	$ 201,660
Fair value
Due in one year or less	15,027
Due after one year through five years	10,028
Due after five years through ten years	0
Due after ten years	355
Mortgage and asset-backed securities	219,809
Fair value	$ 245,219	$ 201,183

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