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2. Investment securities, Fair Value Level 3 Valuation (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Investment Securities Available for Sale Level 3 Valuation  
Balance, beginning of period $ 750
Change in book value 0
Change in gain/(loss) realized and unrealized 0
Purchases/(sales and calls) 0
Transfers in and/or (out) of Level 3 0
Balance, end of period 750
Change in unrealized gain/(loss) for assets still held in Level 3 $ 0