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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Investment securities    
Within one year $ 38,102  
After one but within five years 133,582  
After five but within ten years 10,729  
After ten years 18,137  
Available for sale securities 200,550  
Mortgage-backed securities 61,115  
Total $ 261,665 $ 269,682