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Investments - Realized gains and losses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Available-for-sale Securities [Abstract]        
Proceeds from sales or calls $ 37,690 $ 53,716 $ 63,044 $ 92,647
Gross realized gains from sales or calls 426 927 971 1,692
Gross realized losses from sales or calls (6) (195) (117) (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