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Investments - Realized gains and losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Available-for-sale Securities [Abstract]    
Proceeds from sales or calls $ 25,353 $ 38,933
Gross realized gains from sales or calls 545 765
Gross realized losses from sales or calls (111) (39)
Held-to-maturity Securities [Abstract]    
Proceeds from sales or calls 9,257 0
Gross realized gains from sales or calls 696 0
Gross realized losses from sales or calls $ 0 $ 0