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Other Comprehensive Income (Loss), Summary of Unrealized Gains and Losses on Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]                      
Other comprehensive income (loss) $ (1,239) $ 1,315 $ (1,608) $ 38 $ 962 $ (347) $ 3,313 $ 4,824 $ (1,494) $ 8,752 $ (14,220)
Accumulated Net Unrealized Investment Gain (Loss)                      
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]                      
Balance at beginning of year       $ 2,522       $ (6,591) 2,522 (6,591) 7,940
Unrealized gains (losses) arising during the period                 (754) 15,175 (21,268)
Realized gains during the period                 (1,399) (1,155) (1,087)
Related deferred taxes                 754 (4,907) 7,824
Other comprehensive income (loss)                 (1,399) 9,113 (14,531)
Balance at end of year $ 1,123       $ 2,522       $ 1,123 $ 2,522 $ (6,591)