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Investments - Unrealized losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Mar. 31, 2016
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 186,052 $ 100,566
Less than 12 Months, Unrealized Losses (1,530) (504)
12 Months or More, Fair Value 20,188 20,635
12 Months or More, Unrealized Losses (402) (310)
Total Fair Value 206,240 121,201
Total Unrealized Losses (1,932) (814)
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 21,348 10,899
Less than 12 Months, Unrealized Losses (125) (56)
12 Months or More, Fair Value 3,954 3,785
12 Months or More, Unrealized Losses (92) (79)
Total Fair Value 25,302 14,684
Total Unrealized Losses (217) (135)
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 40,016 9,791
Less than 12 Months, Unrealized Losses (296) (82)
12 Months or More, Fair Value 0 4,319
12 Months or More, Unrealized Losses 0 (14)
Total Fair Value 40,016 14,110
Total Unrealized Losses (296) (96)
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 79,876
Less than 12 Months, Unrealized Losses (1,109) (366)
12 Months or More, Fair Value 16,234 12,531
12 Months or More, Unrealized Losses (310) (217)
Total Fair Value 140,922 92,407
Total Unrealized Losses $ (1,419) $ (583)