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Investments - Unrealized losses (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 131,064 $ 80,631
Less than 12 Months, Unrealized Losses (3,272) (702)
12 Months or More, Fair Value 24,357 48,027
12 Months or More, Unrealized Losses (358) (645)
Total Fair Value 155,421 128,658
Total Unrealized Losses (3,630) (1,347)
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 14,786 10,950
Less than 12 Months, Unrealized Losses (211) (193)
12 Months or More, Fair Value 0 1,737
12 Months or More, Unrealized Losses 0 (50)
Total Fair Value 14,786 12,687
Total Unrealized Losses (211) (243)
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 80,312 16,776
Less than 12 Months, Unrealized Losses (2,679) (89)
12 Months or More, Fair Value 0 15,290
12 Months or More, Unrealized Losses 0 (225)
Total Fair Value 80,312 32,066
Total Unrealized Losses (2,679) (314)
Held-to-maturity Securities    
Less than 12 Months, Fair Value 1,044 1,067
Less than 12 Months, Unrealized Losses (19) (6)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total Fair Value 1,044 1,067
Total Unrealized Losses (19) (6)
U.S. Government agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 35,966 52,905
Less than 12 Months, Unrealized Losses (382) (420)
12 Months or More, Fair Value 24,357 31,000
12 Months or More, Unrealized Losses (358) (370)
Total Fair Value 60,323 83,905
Total Unrealized Losses $ (740) $ (790)