Annual report pursuant to Section 13 and 15(d)

Fair Value, Option, Quantitative Disclosures (Details)

v2.4.1.9
Fair Value, Option, Quantitative Disclosures (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ 59,957us-gaap_FairValueOptionChangesInFairValueGainLoss1 $ 38,684us-gaap_FairValueOptionChangesInFairValueGainLoss1 $ 6,331us-gaap_FairValueOptionChangesInFairValueGainLoss1
Fair Value, Option, Credit Risk, Gains (Losses) on Assets 1,295us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets 6,677us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets 0us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
Equity Securities [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss)   7,843us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Loans Held-for-sale, Mortgages [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 28,657us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Loans Held-for-investment, Mortgages [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 82,345us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Borrowings [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) (51,045)us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Fair Value, Option, Changes in Fair Value, Gain (Loss) 30,549us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Fair Value, Option, Quantitative Disclosures [Line Items]      
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Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 16,089us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 41,220us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) (26,760)us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Fair Value, Option, Changes in Fair Value, Gain (Loss) 0us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss)   7,843us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 0us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Fair Value, Option, Quantitative Disclosures [Line Items]      
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Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 0us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Gain (Loss) on Mortgage Loans Held-for-Sale [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 12,568us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss)   0us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 12,568us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Gain (Loss) on Mortgage Loans Held-for-Sale [Member] | Loans Held-for-investment, Mortgages [Member]      
Fair Value, Option, Quantitative Disclosures [Line Items]      
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Fair Value, Option, Quantitative Disclosures [Line Items]      
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Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) 16,840us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Fair Value, Option, Quantitative Disclosures [Line Items]      
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Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ (24,285)us-gaap_FairValueOptionChangesInFairValueGainLoss1
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