Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Unrealized market adjustments for the period, tax (benefit) $ 1,130 $ (1,508) $ 17
Adjustment for net gains included in net income, benefit $ 0 $ 72 $ 117