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Other Comprehensive Income (Loss) Other Comprehensive Income (Loss), Summary of Unrealized Gains and Losses on Available-for-Sale Securities (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]                      
Other comprehensive income (loss) $ (2,076) $ (1,599) $ (779) $ (8,903) $ (2,462) $ 1,967 $ 443 $ (308) $ (14,220) $ 503 $ 9,444
Accumulated Net Unrealized Investment Gain (Loss)
                      
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]                      
Balance at beginning of year         7,401     (2,057) 7,940 7,401 (2,057)
Unrealized gains (losses) arising during the period                 (21,268) 2,797 17,844
Realized gains during the period                 (1,087) (1,968) (3,293)
Related deferred taxes                 7,824 (290) (5,093)
Other comprehensive income (loss)                 (14,531) 539 9,458
Balance at end of year $ (6,591) $ 7,940             $ (6,591) $ 7,940 $ 7,401