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Investments - Unrealized losses (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 140,107 $ 249,957
Less than 12 Months, Unrealized Losses (1,855) (7,236)
12 Months or More, Fair Value 41,757 35,182
12 Months or More, Unrealized Losses (1,542) (1,793)
Total Fair Value 181,864 285,139
Total Unrealized Losses (3,397) (9,029)
U.S. Government agencies
    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 1,812 4,132
Less than 12 Months, Unrealized Losses (36) (75)
12 Months or More, Fair Value 962 968
12 Months or More, Unrealized Losses (4) (9)
Total Fair Value 2,774 5,100
Total Unrealized Losses (40) (84)
Obligations of states and political subdivisions
    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 35,386 89,556
Less than 12 Months, Unrealized Losses (899) (5,007)
12 Months or More, Fair Value 20,566 15,015
12 Months or More, Unrealized Losses (1,183) (1,510)
Total Fair Value 55,952 104,571
Total Unrealized Losses (2,082) (6,517)
Held-to-maturity Securities    
Less than 12 Months, Fair Value 3,234  
Less than 12 Months, Unrealized Losses (46)  
12 Months or More, Fair Value 0  
12 Months or More, Unrealized Losses 0  
Total Fair Value 3,234  
Total Unrealized Losses 46  
U.S. Government agencies collateralized by residential mortgage obligations
    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 95,493 148,853
Less than 12 Months, Unrealized Losses (871) (2,070)
12 Months or More, Fair Value 20,229 19,199
12 Months or More, Unrealized Losses (355) (274)
Total Fair Value 115,722 168,052
Total Unrealized Losses (1,226) (2,344)
Other equity securities
    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 7,416 7,416
Less than 12 Months, Unrealized Losses (49) (84)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total Fair Value 7,416 7,416
Total Unrealized Losses $ (49) $ (84)