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2. Investment securities, Contractual Maturity (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Amortized Cost  
Due within one year $ 12,931
Due from one to five years 101,101
Due from five to ten years 38,976
Due after ten years 8,257
Mortgage-backed securities 49,731
Trust preferred securities 250
Total 211,246
Estimated Fair Value  
Due within one year 13,039
Due from one to five years 103,219
Due from five to ten years 38,938
Due after ten years 8,285
Mortgage-backed securities 49,568
Trust preferred securities 250
Total $ 213,299