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Investments - Unrealized losses (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 62,918 $ 249,957
Less than 12 Months, Unrealized Losses (469) (7,236)
12 Months or More, Fair Value 75,751 35,182
12 Months or More, Unrealized Losses (1,349) (1,793)
Total Fair Value 138,669 285,139
Total Unrealized Losses (1,818) (9,029)
U.S. Government agencies
    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 11,854 4,132
Less than 12 Months, Unrealized Losses (44) (75)
12 Months or More, Fair Value 916 968
12 Months or More, Unrealized Losses (6) (9)
Total Fair Value 12,770 5,100
Total Unrealized Losses (50) (84)
Obligations of states and political subdivisions
    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 4,982 89,556
Less than 12 Months, Unrealized Losses (37) (5,007)
12 Months or More, Fair Value 40,715 15,015
12 Months or More, Unrealized Losses (928) (1,510)
Total Fair Value 45,697 104,571
Total Unrealized Losses (965) (6,517)
Held-to-maturity Securities    
Less than 12 Months, Fair Value 1,055  
Less than 12 Months, Unrealized Losses (28)  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Total Fair Value 1,055  
Total Unrealized Losses 28  
U.S. Government agencies collateralized by residential mortgage obligations
    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 46,082 148,853
Less than 12 Months, Unrealized Losses (388) (2,070)
12 Months or More, Fair Value 34,120 19,199
12 Months or More, Unrealized Losses (415) (274)
Total Fair Value 80,202 168,052
Total Unrealized Losses (803) (2,344)
Other equity securities
    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value   7,416
Less than 12 Months, Unrealized Losses   (84)
12 Months or More, Fair Value   0
12 Months or More, Unrealized Losses   0
Total Fair Value   7,416
Total Unrealized Losses   $ (84)