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Investments - Realized gains and losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Available-for-sale Securities [Abstract]        
Proceeds from sales or calls $ 21,239 $ 0 $ 84,283 $ 92,647
Gross realized gains from sales or calls 306 0 1,277 1,692
Gross realized losses from sales or calls (20) 0 (137) (233)
Held-to-maturity Securities [Abstract]        
Proceeds from sales or calls 0 0 9,257 0
Gross realized gains from sales or calls 0 0 696 0
Gross realized losses from sales or calls $ 0 $ 0 $ 0 $ 0