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Investments - Unrealized losses (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 106,827 $ 80,631
Less than 12 Months, Unrealized Losses (1,283) (702)
12 Months or More, Fair Value 23,237 48,027
12 Months or More, Unrealized Losses (384) (645)
Total Fair Value 130,064 128,658
Total Unrealized Losses (1,667) (1,347)
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 14,470 10,950
Less than 12 Months, Unrealized Losses (27) (193)
12 Months or More, Fair Value 4,797 1,737
12 Months or More, Unrealized Losses (115) (50)
Total Fair Value 19,267 12,687
Total Unrealized Losses (142) (243)
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 67,406 16,776
Less than 12 Months, Unrealized Losses (1,117) (89)
12 Months or More, Fair Value 0 15,290
12 Months or More, Unrealized Losses 0 (225)
Total Fair Value 67,406 32,066
Total Unrealized Losses (1,117) (314)
Held-to-maturity Securities    
Less than 12 Months, Fair Value 1,048 1,067
Less than 12 Months, Unrealized Losses (11) (6)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total Fair Value 1,048 1,067
Total Unrealized Losses (11) (6)
U.S. Government agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 24,951 52,905
Less than 12 Months, Unrealized Losses (139) (420)
12 Months or More, Fair Value 18,440 31,000
12 Months or More, Unrealized Losses (269) (370)
Total Fair Value 43,391 83,905
Total Unrealized Losses $ (408) $ (790)