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Investments - Unrealized losses (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 205,853 $ 110,926
Less than 12 Months, Unrealized Losses (8,347) (1,217)
12 Months or More, Fair Value 14,857 20,910
12 Months or More, Unrealized Losses (212) (504)
Total Fair Value 220,710 131,836
Total Unrealized Losses (8,559) (1,721)
U.S. Government agencies
    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 1,100 3,590
Less than 12 Months, Unrealized Losses (3) (23)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total Fair Value 1,100 3,590
Total Unrealized Losses (3) (23)
Obligations of states and political subdivisions
    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 93,119 30,572
Less than 12 Months, Unrealized Losses (6,476) (385)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total Fair Value 93,119 30,572
Total Unrealized Losses (6,476) (385)
U.S. Government agencies collateralized by residential mortgage obligations
    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 111,634 76,764
Less than 12 Months, Unrealized Losses (1,868) (809)
12 Months or More, Fair Value 14,626 18,024
12 Months or More, Unrealized Losses (208) (298)
Total Fair Value 126,260 94,788
Total Unrealized Losses (2,076) (1,107)
Private label residential mortgage backed securities
    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Losses 0 0
12 Months or More, Fair Value 231 2,886
12 Months or More, Unrealized Losses (4) (206)
Total Fair Value 231 2,886
Total Unrealized Losses $ (4) $ (206)