2. Investment securities, Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized Cost
Due within one year	$ 21,274
Due from one to five years	63,480
Due from five to ten years	35,496
Due after ten years	8,361
Mortgage-backed securities	53,390
Trust preferred securities	250
Total	182,251	$ 193,296
Estimated Fair Value
Due within one year	21,360
Due from one to five years	65,011
Due from five to ten years	35,827
Due after ten years	8,349
Mortgage-backed securities	53,631
Trust preferred securities	250
Total	$ 184,428