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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 25, 2005
Shares authorized for issuance of grants under equity compensation plan (in shares)       500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Common Shares Class A Non-Voting [Member]        
Common stock, par value (in dollars per share) $ 1us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonClassAMember
     
Common stock, shares authorized (in shares)   15,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonClassAMember
15,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonClassAMember
 
Common Stock Shares Issued 8,059,654us-gaap_CommonStockSharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonClassAMember
7,977,546us-gaap_CommonStockSharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonClassAMember
7,856,485us-gaap_CommonStockSharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonClassAMember
 
Shares available for purchase through retirement plans (in shares) 500,000us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonClassAMember
     
Shares authorized for issuance of grants under equity compensation plan (in shares)       500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonClassAMember
Common Shares Class B Voting [Member]        
Common stock, par value (in dollars per share) $ 1us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonClassBMember
     
Common stock, shares authorized (in shares) 1,040,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonClassBMember
1,040,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonClassBMember
1,040,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonClassBMember
 
Common Stock Shares Issued 882,000us-gaap_CommonStockSharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonClassBMember
882,000us-gaap_CommonStockSharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonClassBMember
882,000us-gaap_CommonStockSharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonClassBMember