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Financial instruments with off-balance sheet risk or concentrations of credit risk (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Guarantor Obligations [Line Items]    
Asset $ 37,260,000 $ 39,045,000
Liability (12,346,000) (8,819,000)
Written Credit Derivatives
    
Guarantor Obligations [Line Items]    
Credit Derivative, Collateral 875,600,000 689,500,000
0-5 years 0 9,882,000
5 years or Greater Expiring Through 2047 7,755,000 550,000
Total Written Credit Default Swaps 7,755,000 10,432,000
Asset 158,000 1,157,000
Liability (1,503,000) (348,000)
Net Asset/(Liability) (1,345,000) 809,000
Written Credit Derivatives | Single name (0 - 250)
    
Guarantor Obligations [Line Items]    
0-5 years 0 368,000
5 years or Greater Expiring Through 2047 5,437,000 0
Total Written Credit Default Swaps 5,437,000 368,000
Asset 0 0
Liability (1,503,000) (104,000)
Net Asset/(Liability) (1,503,000) (104,000)
Written Credit Derivatives | Single name (251-500)
    
Guarantor Obligations [Line Items]    
0-5 years 0 9,514,000
5 years or Greater Expiring Through 2047 2,318,000 0
Total Written Credit Default Swaps 2,318,000 9,514,000
Asset 158,000 1,136,000
Liability 0 0
Net Asset/(Liability) 158,000 1,136,000
Written Credit Derivatives | Index (0-250)
    
Guarantor Obligations [Line Items]    
0-5 years   0
5 years or Greater Expiring Through 2047   550,000
Total Written Credit Default Swaps   550,000
Asset   21,000
Liability   (244,000)
Net Asset/(Liability)   (223,000)
Credit risk exposure
    
Guarantor Obligations [Line Items]    
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure 25,300,000 19,000,000
Estimate of Fair Value Measurement [Member] | Written Credit Derivatives
    
Guarantor Obligations [Line Items]    
Credit Derivative, Collateral $ 8,000,000 $ 2,600,000