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2. Investment securities, Contractual Maturity (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Amortized Cost  
Due within one year $ 21,379
Due from one to five years 80,932
Due from five to ten years 32,271
Due after ten years 6,569
Mortgage-backed securities 52,145
Total 193,296
Estimated Fair Value  
Due within one year 21,426
Due from one to five years 82,325
Due from five to ten years 32,174
Due after ten years 6,550
Mortgage-backed securities 52,103
Total $ 194,578