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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Investment securities    
Within one year $ 41,486  
After one but within five years 108,231  
After five but within ten years 19,951  
After ten years 33,297  
Available for sale securities 202,965  
Mortgage-backed securities 127,513  
Total $ 330,478 $ 269,682