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Variable Interest Entities (Narrative) (Details) (USD $)
1 Months Ended 12 Months Ended
Nov. 30, 2009
Dec. 31, 2014
Dec. 31, 2013
Variable Interest Entity [Line Items]      
Long-term debt   $ 182,606,000us-gaap_LongTermDebt $ 182,672,000us-gaap_LongTermDebt
Equity method investments   1,300,000us-gaap_EquityMethodInvestments  
Partnership total assets   9,400,000us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets 9,700,000us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Long-term debt   41,700,000us-gaap_LongTermDebt
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
 
Variable Interest Entity, Not Primary Beneficiary [Member] | Junior Subordinated Debt [Member]      
Variable Interest Entity [Line Items]      
Long-term debt   5,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
 
Subsidiaries [Member]      
Variable Interest Entity [Line Items]      
Equity method investments 6,100,000us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Ownership in Liberty Mews Limited Partnership 99.99%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
VIE financing 10,600,000us-gaap_VariableInterestEntityFinancialOrOtherSupportAmount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Purchase of land for low income housing by Liberty Mews 10,600,000us-gaap_PaymentsToAcquireOtherInvestments
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Federal investment tax credits   $ 8,400,000us-gaap_InvestmentTaxCredit
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Federal investment tax credit duration   10 years