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Financial instruments with off-balance sheet risk or concentrations of credit risk (Details) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Guarantor Obligations [Line Items]    
Asset $ 22,516,000 $ 39,045,000
Liability (10,528,000) (8,819,000)
Written Credit Derivatives
    
Guarantor Obligations [Line Items]    
Credit Derivative, Collateral 363,300,000 689,500,000
0-5 years 9,105,000 9,882,000
5 years or Greater Expiring Through 2047 6,931,000 550,000
Total Written Credit Default Swaps 16,036,000 10,432,000
Asset 1,221,000 1,157,000
Liability (1,254,000) (348,000)
Net Asset/(Liability) (33,000) 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 4,555,000 0
Total Written Credit Default Swaps 4,555,000 368,000
Asset 0 0
Liability (1,254,000) (104,000)
Net Asset/(Liability) (1,254,000) (104,000)
Written Credit Derivatives | Single name (251-500)
    
Guarantor Obligations [Line Items]    
0-5 years 9,105,000 9,514,000
5 years or Greater Expiring Through 2047 2,376,000 0
Total Written Credit Default Swaps 11,481,000 9,514,000
Asset 1,221,000 1,136,000
Liability 0 0
Net Asset/(Liability) 1,221,000 1,136,000
Written Credit Derivatives | Index (0-250)
    
Guarantor Obligations [Line Items]    
0-5 years 0 0
5 years or Greater Expiring Through 2047 0 550,000
Total Written Credit Default Swaps 0 550,000
Asset 0 21,000
Liability 0 (244,000)
Net Asset/(Liability) 0 (223,000)
Credit risk exposure
    
Guarantor Obligations [Line Items]    
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure 7,800,000 19,000,000
Estimate of Fair Value Measurement [Member] | Written Credit Derivatives
    
Guarantor Obligations [Line Items]    
Credit Derivative, Collateral $ 1,600,000 $ 2,600,000