XML 119 R58.htm IDEA: XBRL DOCUMENT v2.4.0.8
Investment Securities - Realized Gains (Losses) on Investments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Investments, Debt and Equity Securities [Abstract]      
Gross realized gains $ 49 $ 351 $ 1,544
Gross realized losses 48 3 0
Political Subdivisions
     
Schedule of Available-for-sale Securities      
Available-for-sale Securities, Amortized Cost Basis 147,443    
Montana, Wyoming, and South Dakota | Political Subdivisions
     
Schedule of Available-for-sale Securities      
Available-for-sale Securities, Amortized Cost Basis $ 75,337