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Commitments and Contingencies - Unrecorded Purchase Commitments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Construction Contracts  
Unrecorded Unconditional Purchase Obligation  
Commitments to Purchase $ 4,047us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_ConstructionContractsMember
Residential Mortgage Backed Securities [Member]  
Unrecorded Unconditional Purchase Obligation  
Commitments to Purchase $ 16,840us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
/ us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember