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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Investment securities  
Within one year $ 38,925
After one but within five years 152,806
After five but within ten years 15,900
After ten years 10,586
Available for sale securities 218,217
Mortgage-backed securities 51,465
Total $ 269,682