Annual report pursuant to Section 13 and 15(d)

RELATED PARTY TRANSACTIONS (Narrative) (Details)

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RELATED PARTY TRANSACTIONS (Narrative) (Details) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Feb. 29, 2012
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deposit accounts $ 22,200,000     $ 22,200,000 $ 22,200,000  
Authorized shares for repurchase 750,000     250,000 750,000  
Stock purchased under stock repurchase plan, shares   335,649 500,000 500,000 970,265  
Stock repurchased, aggregate purchase price   4,363,437 9,500,000 9,499,000 14,445,000 35,595,000
Stock repurchased, purchase price per share $ 15.44 $ 13.00 $ 19.00      
Markel Corporation [Member]
           
Stock purchased under stock repurchase plan, shares 750,000   500,000      
Stock repurchased, aggregate purchase price $ 11,580,000   $ 9,500,000      
Stock repurchased, purchase price per share $ 15.44   $ 19.00