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Concentrations of Credit Risk MF Risk Characteristics (Details) - Multifamily [Member]
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Minimum [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Serious delinquency, days past due 60 days 60 days
Current debt service coverage ratio reporting lag 3 months 3 months
Maximum [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current debt service coverage ratio (higher risk loans) 1.0 1.0
Serious delinquency, days past due 89 days 89 days
Current debt service coverage ratio reporting lag 6 months 6 months
Guaranty Book of Business [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30 days delinquent (percentage of book of business) 0.01% 0.02%
Seriously delinquent (percentage of book of business) 0.05% 0.05%
Percentage of loans with detailed loan level information 99.00% 99.00%
Guaranty Book of Business [Member] | Original LTV ratio greater than 80% [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 2.00% 2.00%
Loans seriously delinquent, percentage by unpaid principal balance 0.33% 0.22%
Guaranty Book of Business [Member] | Original LTV ratio less than or equal to 80% [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 98.00% 98.00%
Loans seriously delinquent, percentage by unpaid principal balance 0.04% 0.05%
Guaranty Book of Business [Member] | Current DSCR less than 100% [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of book of business 1.00% 2.00%
Loans seriously delinquent, percentage by unpaid principal balance 2.11% 1.96%