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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Investment securities  
Within one year $ 12,238
After one but within five years 168,657
After five but within ten years 35,278
After ten years 16,169
Available for sale securities 232,342
Mortgage-backed securities 40,160
Total $ 272,502