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Investments - Unrealized losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Jun. 30, 2016
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 186,052 $ 66,865
Less than 12 Months, Unrealized Losses (1,530) (366)
12 Months or More, Fair Value 20,188 15,040
12 Months or More, Unrealized Losses (402) (210)
Total Fair Value 206,240 81,905
Total Unrealized Losses (1,932) (576)
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 21,348 23,396
Less than 12 Months, Unrealized Losses (125) (84)
12 Months or More, Fair Value 3,954 3,646
12 Months or More, Unrealized Losses (92) (57)
Total Fair Value 25,302 27,042
Total Unrealized Losses (217) (141)
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 40,016 1,033
Less than 12 Months, Unrealized Losses (296) (38)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total Fair Value 40,016 1,033
Total Unrealized Losses (296) (38)
Held-to-maturity Securities    
Less than 12 Months, Fair Value 1,053  
Less than 12 Months, Unrealized Losses (1)  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Total Fair Value 1,053  
Total Unrealized Losses (1)  
U.S. Government agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 124,688 42,436
Less than 12 Months, Unrealized Losses (1,109) (244)
12 Months or More, Fair Value 16,234 11,394
12 Months or More, Unrealized Losses (310) (153)
Total Fair Value 140,922 53,830
Total Unrealized Losses $ (1,419) $ (397)