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Investments (Investment Gains and Losses) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Held to maturity debt securities:          
Real estate gains (losses) $ 820 $ 55 $ 954 $ 55  
Mortgage loans write-downs 0 0 0 0  
Other (478) 0 (478) 0  
Totals 2,169 3,298 6,782 7,451  
Percentage of gains on bonds, due to calls of securities     87.00%    
Total other-than-temporary impairment gains (losses) on debt securities 0 214 (4) 538  
Portion of loss (gain) recognized in comprehensive income 0 (227) (3) (776)  
Net impairment losses on debt securities recognized in earnings 0 (13) (7) (238)  
Equity securities impairments 0 0 (28) (14)  
Net OTTI losses recognized in earnings 0 (13) (35) (252)  
Non-Credit Other-than-Temporary Impairment, Credit Losses Recognized in Other Comprehensive Income (Loss) [Roll Forward]          
Beginning balance, cumulative credit losses related to other-than-temporary impairments 2,479   2,472 2,247 2,247
Reductions for securities sold during current period 0   0   (17)
Additions for credit losses not previously recognized in other-than-temporary impairments 0   7   242
Ending balance, cumulative credit losses related to other-than-temporary impairments 2,479   2,479   2,472
Debt Securities [Member]
         
Available for sale debt securities:          
Realized gains on disposal 1,467 415 5,144 3,739  
Realized losses on disposal 0 (3) (22) (3)  
Held to maturity debt securities:          
Realized gains on disposal 353 2,831 1,167 3,221  
Realized losses on disposal 0 0 (17) (72)  
Equity Securities [Member]
         
Held to maturity debt securities:          
Equity securities realized gains (losses) $ 7 $ 0 $ 34 $ 511